Published output ratings
Two different voltage banks
Each voltage belongs to its own output leads and its own connected auxiliary battery.
Dual-Output 12V/36V Marine DC-DC Charger | Charge on the Run
CHG-DC-12V36V
Regular price
$249.00
Dual output · Charge on the run · 12V and 36V auxiliary power
Dual-Output 12V & 36V Marine DC-to-DC Charger | Charge on the Run
Charge a separate 12V auxiliary battery and a 36V trolling-motor battery from one compatible 12V or 24V starter-battery system.
The Epoch 12V/36V DC-to-DC charger turns engine-run time into managed auxiliary charging across the boat. One independent 12V / 10A output supports a house or electronics battery, while a second 36V / 10A output charges a compatible trolling-motor battery. Automatic source-voltage sensing, selectable battery profiles, lithium BMS activation, IP67 construction, and compact onboard mounting simplify mixed-voltage marine power management.
12V / 24V
Source input
12V / 10A
Output bank 1
36V / 10A
Output bank 2
2
Independent banks
IP67
Enclosure rating
Non-isolated
Architecture
Smart mixed-voltage charging for the entire boat
Dual-output charging
12V and 36V auxiliary banks
Voltage-sensing control
Automatic start and stop
Three chemistry modes
LiFePO4, lead-acid, AGM
Lithium activation
Wake compatible BMS
Active cooling
Aluminum plus waterproof fan
Built-in protection
Short, reverse, heat, overcharge
The Ultimate “Charge on the Run” Power Manager
Use one starter-battery charging system to support both 12V auxiliary loads and 36V trolling power.
Modern bass boats can carry heavy 12V electronics loads and a high-capacity 36V trolling-motor battery. The CHG-DC-12V36V bridges those auxiliary systems to a compatible 12V or 24V starter-battery source without connecting the batteries directly together.
The input starter battery remains the source side. The 12V output is for a separate auxiliary or house battery; it should not be connected back to the same battery used as the charger input.
Dual Outputs: 12V and 36V Auxiliary Charging
The independent outputs provide 12V / 10A and 36V / 10A. Use the 12V bank for a separate electronics, house, or secondary battery and the 36V bank for a compatible trolling-motor battery.
Smart Voltage Sensing Without a Manual Trigger
A 12V source starts charging above 13.8V and stops below 13.0V. A 24V source starts above 26.8V and stops below 25.2V. Hibernation reduces idle activity while the charger continues monitoring source voltage.
Advanced Battery Profiles for Both Outputs
Each output supports LiFePO4, lead-acid, or AGM mode. Select the battery type before charging, and use the BMS activation function for a compatible sleeping lithium battery.
Harness Alternator Power for the Boat’s Auxiliary Systems
Supplement electronics and trolling-motor energy every time the source charging system is active.
With both outputs at full rating, the charger can provide approximately 120W to the 12V bank and 360W to the 36V bank—about 480W of aggregate nominal output before conversion losses.
That useful output also creates significant source-side demand, especially on a 12V system. Verify the outboard alternator or vehicle charging-system rating, starting-battery condition, existing electronics load, cable sizing, fuse protection, voltage drop, and available charging margin before commissioning.
Built for Demanding Marine Environments
Epoxy-filled ingress protection, active thermal management, and rigid onboard mounting.
IP67 Epoxy-Filled Enclosure
Pure epoxy filling gives the enclosure a high ingress-protection rating for correctly installed onboard use. Protect the leads, terminals, glands, and connections, and do not treat IP67 as permission for intentional or permanent submersion.
Aluminum Cooling with Waterproof Fan
This charger is not fanless. Its aluminum housing and bottom cooling plate work with a waterproof cooling fan. Maintain more than 30mm of clearance and never block the fan or heat-dissipation surfaces.
Compact, Secure Onboard Mounting
The 250 × 149 × 68mm enclosure uses 6.5mm mounting holes with M6 fasteners recommended. Secure the charger to a rigid surface and protect every lead from vibration, abrasion, heat, and sharp edges.
Clean Installation Without Networking Hubs
Three clearly defined connection groups: source input, 12V auxiliary output, and 36V auxiliary output.
The charger does not require a published NMEA 2000 or proprietary data network. Connect the input pair to the compatible starter-battery source, the 12V output pair to a separate 12V auxiliary battery, and the 36V output pair to the compatible trolling-motor battery.
This is a non-isolated charger. Red and black conductors within the same cable jacket must connect to the same battery, and a black lead must never be landed on a terminal carrying red leads. Follow the supplied wiring diagram exactly.
Compatible use cases
Bass boats, tournament fishing, mixed-voltage auxiliaries, and trolling-motor systems.
- ✓ Bass boats using a 12V starter system, a separate 12V electronics or house battery, and a native 36V trolling-motor battery.
- ✓ Tournament fishing systems that need charging support for both auxiliary voltage platforms while the outboard is running.
- ✓ Boats with a compatible 24V source system and separate 12V plus 36V auxiliary batteries.
- ✓ 12V and 36V LiFePO4 batteries using the individually selected lithium modes.
- ✓ Compatible 12V or 36V AGM and lead-acid auxiliary batteries using the correct bank-specific mode.
- ✓ Marine power-management systems that do not require NMEA 2000 or proprietary networking hubs.
- ✓ Sleeping lithium batteries that support charger-based BMS activation.
- ✓ Onboard installations with adequate alternator output, fusing, cable sizing, ventilation, secure mounting, and common-ground planning.
Charger features
Dual outputs, voltage sensing, chemistry selection, BMS activation, marine sealing, and built-in protection.
Two independent auxiliary outputs
One 12V / 10A bank and one 36V / 10A bank can manage separate batteries from one unit.
12V or 24V source compatibility
Accepts a compatible starter-battery system within the published 13–30VDC range.
Automatic 12V thresholds
Starts above 13.8V and stops below 13.0V.
Automatic 24V thresholds
Starts above 26.8V and stops below 25.2V.
Up to 480W nominal output
Approximately 120W on the 12V bank plus 360W on the 36V bank before conversion losses.
Independent chemistry selection
Choose LiFePO4, lead-acid, or AGM separately for the 12V and 36V outputs.
Lithium BMS activation
Hold the applicable MODE button for approximately three seconds after selecting LiFePO4.
Automatic hibernation
Enters low-activity monitoring after approximately 20 minutes at idle.
Manual power control
Hold MODE for six seconds to switch off; short-press MODE to wake.
LED status information
Displays power, selected chemistry, charging, full charge, and polarity-fault conditions.
IP67 epoxy-filled enclosure
High ingress protection for correctly installed onboard use.
Active thermal management
Aluminum housing and cooling plate work with a waterproof fan.
Non-isolated design
Requires disciplined polarity, grounding, fusing, and wiring-diagram compliance.
Circuit protection
Includes short-circuit, reverse-connection, overcharge, and overtemperature protection.
Complete the dual-output marine power system
Pair the charger with compatible batteries, dockside charging, monitoring, and engineered DC distribution.
Epoch 12V Auxiliary Battery
Use the 12V output for a compatible separate electronics, house, or secondary battery.
Epoch Native 36V Trolling Battery
Use the 36V output with a compatible single 36V battery.
Epoch AC Onboard Charger
Complete the daily recharge and balancing process at the dock.
Marine DC Fusing and Disconnects
Protect source and output conductors according to the supplied diagram and applicable standards.
Marine-Grade Cables and Lugs
Size conductors for source-side current, run length, voltage drop, temperature, and routing.
Battery Monitoring
Track the starter, 12V auxiliary, and 36V trolling systems independently when detailed energy data is required.
Secure Trays and Mounting Hardware
Prevent battery and charger movement during trailering, rough water, and high-speed operation.
Technical Specifications
Exact input thresholds, auxiliary outputs, chemistry modes, operating logic, connections, isolation, protection, and mounting data.
| Identification | |
|---|---|
| Brand | Epoch Batteries |
| Product | Dual-Output 12V/36V Marine DC-to-DC Charger | Charge on the Run |
| Model / SKU | CHG-DC-12V36V |
| Product type | Two-bank, non-isolated marine DC-to-DC battery charger |
| Charging banks | 2 independently operating output banks |
| Published warranty term | 2-year limited warranty: free repair or replacement |
| Source Input | |
| Supported source systems | Compatible 12V or 24V starter-battery systems |
| Published DC input range | 13–30VDC |
| Unsupported input | 36V input batteries are not supported |
| 12V start threshold | Above 13.8V |
| 12V stop threshold | Below 13.0V |
| 24V start threshold | Above 26.8V |
| 24V stop threshold | Below 25.2V |
| Published input-current rating | Not listed on the current product page |
| Auxiliary Outputs | |
| 12V output bank | 12V / 10A |
| 36V output bank | 36V / 10A |
| Approximate nominal output power | 12V bank ≈120W; 36V bank ≈360W; aggregate ≈480W before conversion losses |
| 12V output purpose | Separate 12V auxiliary, house, electronics, or secondary battery |
| 36V output purpose | Separate compatible 36V auxiliary or trolling-motor battery |
| Same-battery loopback | Do not connect the 12V output back to the starter battery used as the input source |
| Battery Compatibility and Controls | |
| 12V bank chemistry modes | 12V LiFePO4, 12V lead-acid, or 12V AGM |
| 36V bank chemistry modes | 36V LiFePO4, 36V lead-acid, or 36V AGM |
| Mode selection | Separate front-panel MODE controls for the output banks |
| Mode-change rule | Select before charging; disconnect that bank's output ring terminals before changing chemistry |
| Lithium BMS activation | Select LiFePO4 and hold the applicable MODE control for approximately 3 seconds |
| Cold-weather lithium charging | Do not charge below 0°C / 32°F unless the battery has approved heating or manufacturer permission |
| Operating Logic and Indicators | |
| Automatic source detection | Starts and stops according to detected 12V or 24V source voltage |
| Idle / hibernation | Enters hibernation after approximately 20 minutes at idle while monitoring input voltage |
| Manual power control | Hold MODE for 6 seconds to turn off; short-press MODE to wake |
| Normal charge indication | POWER solid green; CHARGING solid red |
| Full-charge indication | POWER and CHARGING LEDs solid green |
| Other indicators | Selected battery chemistry and reverse-polarity status |
| Connections and Isolation | |
| Input connection | Pre-wired ring-terminal leads; red positive and black negative |
| 12V output connection | Pre-wired ring-terminal leads; red positive and black negative |
| 36V output connection | Pre-wired ring-terminal leads; red positive and black negative |
| Connection groups | One input pair plus one 12V output pair plus one 36V output pair |
| Isolation | Non-isolated |
| Wiring boundary | Red and black leads within the same cable jacket must connect to the same battery |
| Grounding warning | A black lead must never be connected to a terminal carrying red leads |
| Network requirement | No published NMEA 2000 or proprietary data-network requirement |
| Protection and Cooling | |
| Short-circuit protection | Yes |
| Reverse-connection protection | Yes |
| Overcharge protection | Yes |
| Overtemperature protection | Yes |
| Housing | Aluminum housing with bottom aluminum cooling plate |
| Cooling | Waterproof cooling fan; not fanless |
| 12V bank replacement fuse | 15A |
| 36V bank replacement fuse | 15A |
| Environmental and Mechanical | |
| Ingress protection | IP67; enclosure filled with pure epoxy resin |
| Working temperature | -20°C to 40°C / -4°F to 104°F |
| Nominal working temperature | 25°C / 77°F |
| Product dimensions | 250 × 149 × 68mm / approximately 9.84 × 5.87 × 2.68 in |
| Mounting holes | 6.5mm |
| Recommended fasteners | M6 screws appropriate for the mounting surface |
| Required clearance | More than 30mm; do not block the fan or cooling surfaces |
| Published weight | Not listed on the current product page |
| Installation Boundaries | |
| Alternator compatibility | Verify rated output and available charging current after all existing boat loads |
| Source-side demand | Can be substantial because the two outputs total approximately 480W before conversion losses |
| Series-built 36V bank | Follow the battery manufacturer's approved charging and balancing method |
| Dockside charging | DC-to-DC charging supplements but does not replace a full AC recharge |
| Ingress caution | Do not intentionally submerge; protect ring terminals, cables, and connections |
| System protection | Use appropriate fusing, disconnects, conductor sizing, grounding, and marine installation practices |
Alternator and marine installation note
Regulated charging does not remove the need to engineer the complete source and auxiliary circuits.
Verify source-system output, battery condition, fusing, cable ampacity, voltage drop, grounding, mounting, ventilation, chemistry settings, and auxiliary-battery limits. Disconnect and isolate all batteries before service. Never charge a frozen, damaged, or unsupported battery, and do not treat IP67 as permission for permanent submersion.
Dual-bank DC-to-DC output visualizer
One starter system. Two independently regulated battery outputs.
A compatible 12V or 24V starter-battery source feeds one charger that separately manages a 12V auxiliary bank at up to 10A and a 36V auxiliary bank at up to 10A.
12V / 24VStarter-battery source
13–30VAccepted DC input range
12V / 10AIndependent output bank 1
36V / 10AIndependent output bank 2
Maximum rated output current
Equal current ratings, separate control
The ratings describe two independent 10A outputs—not one combined 20A battery output.
Illustrative operating snapshots
Independent means the banks do not have to taper or finish together.
Each bank responds to its own connected battery. One output can remain active while the other reduces current or completes charging.
Example ADifferent charging demand
12V bank
9A active
36V bank
4A tapering
Example BOne bank completes first
12V bank
Complete
36V bank
10A active
Example currents above are hypothetical and only illustrate independent regulation; they are not a recorded charge test.
Automatic source-battery control
Start and stop thresholds depend on the source system.
The charger begins after alternator-raised source voltage crosses the applicable start point and stops as source voltage falls below the corresponding stop point.
12V source system13.0V ↔ 13.8V
0.8V switching gap
STOP
SWITCHING GAP
START / RUN
13.0V
13.8V
Stops below 13.0VStarts above 13.8V
24V source system25.2V ↔ 26.8V
1.6V switching gap
STOP
SWITCHING GAP
START / RUN
25.2V
26.8V
Stops below 25.2VStarts above 26.8V
12V auxiliary bank
Independent 12V / 10A output with selectable LiFePO4, AGM, and lead-acid modes.
36V auxiliary bank
Independent 36V / 10A output with selectable LiFePO4, AGM, and lead-acid modes.
Source and wiring
Use a compatible 12V or 24V starter source. The charger is non-isolated, and a 36V battery is not supported as its input.
Visual compares published nominal output ratings and illustrates independent regulation. It is not a measured voltage/current/time charging curve. The two 10A figures are output-bank ratings; starter-side current varies with source voltage, battery demand, conversion efficiency, and operating conditions.
Frequently asked questions
Dual-Output 12V/36V DC-to-DC Charger FAQs
Common questions about both outputs, starter-battery reserve, alternator capacity, isolation, battery chemistry, cooling, and onboard mounting.
How does the dual-output 12V/36V “charge on the run” system work?
The charger draws from a compatible 12V or 24V starter-battery system and manages two separate auxiliary outputs: one 12V / 10A bank and one 36V / 10A bank. It monitors source voltage and begins charging when the source rises above the published engine-running threshold. This allows a separate 12V auxiliary battery and a 36V trolling-motor battery to receive regulated charging from one onboard unit.
Does the 12V output charge the same starter battery used as the input?
No. The starter battery or starter-battery system is the input source. The 12V output is intended for a separate 12V auxiliary, house, electronics, or secondary battery. Do not loop the 12V output back to the same battery used as the charger input.
Will the 36V output drain my starting battery while I am fishing?
The automatic voltage thresholds are designed to stop both auxiliary outputs when source voltage falls below the published cutoff. With a 12V source, charging starts above 13.8V and stops below 13.0V; with a 24V source, it starts above 26.8V and stops below 25.2V. The charger also hibernates after about 20 idle minutes while continuing to monitor source voltage. A healthy starter battery and properly sized alternator are still required.
Can I use a 24V starter-battery system as the charger input?
Yes. Epoch publishes a 13–30VDC input range for compatible 12V or 24V starter systems. A 36V battery is not supported as the input source. Verify the source system, polarity, fusing, grounding, and alternator capacity before installation.
Can I use the 36V output on three 12V batteries wired in series?
Epoch publishes the 36V output for one compatible 36V battery. A three-battery 12V series string may require individual-bank charging and balancing under the battery manufacturer's instructions. Do not assume that charging only across the full 36V string will keep all three 12V batteries balanced.
Does this replace my plug-in AC onboard charger?
No. The DC-to-DC charger supplements energy while the source charging system is active. Its outputs are limited to 12V / 10A and 36V / 10A, so a short engine run may replace only part of the energy used. A compatible AC onboard charger is still recommended for a complete dockside recharge and periodic balancing.
Will this charger protect every outboard alternator from overload?
The charger regulates its auxiliary outputs instead of connecting the battery banks directly, but universal alternator compatibility cannot be assumed. The two outputs represent up to approximately 480W of nominal charging power before conversion losses, so source-side current on a 12V system can be substantial. Verify alternator output, existing boat loads, cable size, fusing, voltage drop, and available charging margin.
Is this an isolated DC-to-DC charger?
No. Epoch lists the CHG-DC-12V36V as non-isolated. Automatic voltage sensing is not galvanic isolation. Connect every red and black pair exactly as shown in the supplied diagram, plan the common-ground architecture correctly, and use appropriate fusing and conductor protection.
Can each output charge lithium, AGM, or lead-acid batteries?
Yes. The 12V and 36V output banks each support selectable LiFePO4, lead-acid, and AGM modes. Use the MODE control for the applicable bank before charging. A bank's chemistry setting cannot be changed while it is charging; disconnect that bank's output ring terminals before selecting a different mode.
Is the charger fanless?
No. The charger uses an aluminum housing and bottom cooling plate together with a waterproof cooling fan. Maintain more than 30mm of clearance and keep the fan and heat-dissipation surfaces unobstructed.
Can I mount the charger in a wet bilge compartment?
The enclosure is epoxy-filled and rated IP67, but the ring terminals, cables, and connections still require protection. Do not intentionally submerge the charger. Mount it securely in a protected, ventilated location where the fan, glands, terminals, and wiring can be inspected.
Can it wake a deeply discharged lithium battery?
Yes, for a compatible sleeping LiFePO4 battery. Select LiFePO4 on the applicable output bank and hold its MODE button for approximately three seconds until the charging indicator responds. BMS activation cannot repair a damaged, frozen, or unsafe battery.
Can I charge a frozen LiFePO4 battery?
No. Do not charge LiFePO4 below 0°C / 32°F unless the battery has an approved internal heating system or its manufacturer specifically permits below-freezing charging. The charger's operating-temperature range does not override the battery's low-temperature charging limit.
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CHG-DC-12V36V
Regular price
$249.00
Dual output · Charge on the run · 12V and 36V auxiliary power
Dual-Output 12V & 36V Marine DC-to-DC Charger | Charge on the Run
Charge a separate 12V auxiliary battery and a 36V trolling-motor battery from one compatible 12V or 24V starter-battery system.
The Epoch 12V/36V DC-to-DC charger turns engine-run time into managed auxiliary charging across the boat. One independent 12V / 10A output supports a house or electronics battery, while a second 36V / 10A output charges a compatible trolling-motor battery. Automatic source-voltage sensing, selectable battery profiles, lithium BMS activation, IP67 construction, and compact onboard mounting simplify mixed-voltage marine power management.
12V / 24V
Source input
12V / 10A
Output bank 1
36V / 10A
Output bank 2
2
Independent banks
IP67
Enclosure rating
Non-isolated
Architecture
Smart mixed-voltage charging for the entire boat
Dual-output charging
12V and 36V auxiliary banks
Voltage-sensing control
Automatic start and stop
Three chemistry modes
LiFePO4, lead-acid, AGM
Lithium activation
Wake compatible BMS
Active cooling
Aluminum plus waterproof fan
Built-in protection
Short, reverse, heat, overcharge
The Ultimate “Charge on the Run” Power Manager
Use one starter-battery charging system to support both 12V auxiliary loads and 36V trolling power.
Modern bass boats can carry heavy 12V electronics loads and a high-capacity 36V trolling-motor battery. The CHG-DC-12V36V bridges those auxiliary systems to a compatible 12V or 24V starter-battery source without connecting the batteries directly together.
The input starter battery remains the source side. The 12V output is for a separate auxiliary or house battery; it should not be connected back to the same battery used as the charger input.
Dual Outputs: 12V and 36V Auxiliary Charging
The independent outputs provide 12V / 10A and 36V / 10A. Use the 12V bank for a separate electronics, house, or secondary battery and the 36V bank for a compatible trolling-motor battery.
Smart Voltage Sensing Without a Manual Trigger
A 12V source starts charging above 13.8V and stops below 13.0V. A 24V source starts above 26.8V and stops below 25.2V. Hibernation reduces idle activity while the charger continues monitoring source voltage.
Advanced Battery Profiles for Both Outputs
Each output supports LiFePO4, lead-acid, or AGM mode. Select the battery type before charging, and use the BMS activation function for a compatible sleeping lithium battery.
Harness Alternator Power for the Boat’s Auxiliary Systems
Supplement electronics and trolling-motor energy every time the source charging system is active.
With both outputs at full rating, the charger can provide approximately 120W to the 12V bank and 360W to the 36V bank—about 480W of aggregate nominal output before conversion losses.
That useful output also creates significant source-side demand, especially on a 12V system. Verify the outboard alternator or vehicle charging-system rating, starting-battery condition, existing electronics load, cable sizing, fuse protection, voltage drop, and available charging margin before commissioning.
Built for Demanding Marine Environments
Epoxy-filled ingress protection, active thermal management, and rigid onboard mounting.
IP67 Epoxy-Filled Enclosure
Pure epoxy filling gives the enclosure a high ingress-protection rating for correctly installed onboard use. Protect the leads, terminals, glands, and connections, and do not treat IP67 as permission for intentional or permanent submersion.
Aluminum Cooling with Waterproof Fan
This charger is not fanless. Its aluminum housing and bottom cooling plate work with a waterproof cooling fan. Maintain more than 30mm of clearance and never block the fan or heat-dissipation surfaces.
Compact, Secure Onboard Mounting
The 250 × 149 × 68mm enclosure uses 6.5mm mounting holes with M6 fasteners recommended. Secure the charger to a rigid surface and protect every lead from vibration, abrasion, heat, and sharp edges.
Clean Installation Without Networking Hubs
Three clearly defined connection groups: source input, 12V auxiliary output, and 36V auxiliary output.
The charger does not require a published NMEA 2000 or proprietary data network. Connect the input pair to the compatible starter-battery source, the 12V output pair to a separate 12V auxiliary battery, and the 36V output pair to the compatible trolling-motor battery.
This is a non-isolated charger. Red and black conductors within the same cable jacket must connect to the same battery, and a black lead must never be landed on a terminal carrying red leads. Follow the supplied wiring diagram exactly.
Compatible use cases
Bass boats, tournament fishing, mixed-voltage auxiliaries, and trolling-motor systems.
- ✓ Bass boats using a 12V starter system, a separate 12V electronics or house battery, and a native 36V trolling-motor battery.
- ✓ Tournament fishing systems that need charging support for both auxiliary voltage platforms while the outboard is running.
- ✓ Boats with a compatible 24V source system and separate 12V plus 36V auxiliary batteries.
- ✓ 12V and 36V LiFePO4 batteries using the individually selected lithium modes.
- ✓ Compatible 12V or 36V AGM and lead-acid auxiliary batteries using the correct bank-specific mode.
- ✓ Marine power-management systems that do not require NMEA 2000 or proprietary networking hubs.
- ✓ Sleeping lithium batteries that support charger-based BMS activation.
- ✓ Onboard installations with adequate alternator output, fusing, cable sizing, ventilation, secure mounting, and common-ground planning.
Charger features
Dual outputs, voltage sensing, chemistry selection, BMS activation, marine sealing, and built-in protection.
Two independent auxiliary outputs
One 12V / 10A bank and one 36V / 10A bank can manage separate batteries from one unit.
12V or 24V source compatibility
Accepts a compatible starter-battery system within the published 13–30VDC range.
Automatic 12V thresholds
Starts above 13.8V and stops below 13.0V.
Automatic 24V thresholds
Starts above 26.8V and stops below 25.2V.
Up to 480W nominal output
Approximately 120W on the 12V bank plus 360W on the 36V bank before conversion losses.
Independent chemistry selection
Choose LiFePO4, lead-acid, or AGM separately for the 12V and 36V outputs.
Lithium BMS activation
Hold the applicable MODE button for approximately three seconds after selecting LiFePO4.
Automatic hibernation
Enters low-activity monitoring after approximately 20 minutes at idle.
Manual power control
Hold MODE for six seconds to switch off; short-press MODE to wake.
LED status information
Displays power, selected chemistry, charging, full charge, and polarity-fault conditions.
IP67 epoxy-filled enclosure
High ingress protection for correctly installed onboard use.
Active thermal management
Aluminum housing and cooling plate work with a waterproof fan.
Non-isolated design
Requires disciplined polarity, grounding, fusing, and wiring-diagram compliance.
Circuit protection
Includes short-circuit, reverse-connection, overcharge, and overtemperature protection.
Complete the dual-output marine power system
Pair the charger with compatible batteries, dockside charging, monitoring, and engineered DC distribution.
Epoch 12V Auxiliary Battery
Use the 12V output for a compatible separate electronics, house, or secondary battery.
Epoch Native 36V Trolling Battery
Use the 36V output with a compatible single 36V battery.
Epoch AC Onboard Charger
Complete the daily recharge and balancing process at the dock.
Marine DC Fusing and Disconnects
Protect source and output conductors according to the supplied diagram and applicable standards.
Marine-Grade Cables and Lugs
Size conductors for source-side current, run length, voltage drop, temperature, and routing.
Battery Monitoring
Track the starter, 12V auxiliary, and 36V trolling systems independently when detailed energy data is required.
Secure Trays and Mounting Hardware
Prevent battery and charger movement during trailering, rough water, and high-speed operation.
Technical Specifications
Exact input thresholds, auxiliary outputs, chemistry modes, operating logic, connections, isolation, protection, and mounting data.
| Identification | |
|---|---|
| Brand | Epoch Batteries |
| Product | Dual-Output 12V/36V Marine DC-to-DC Charger | Charge on the Run |
| Model / SKU | CHG-DC-12V36V |
| Product type | Two-bank, non-isolated marine DC-to-DC battery charger |
| Charging banks | 2 independently operating output banks |
| Published warranty term | 2-year limited warranty: free repair or replacement |
| Source Input | |
| Supported source systems | Compatible 12V or 24V starter-battery systems |
| Published DC input range | 13–30VDC |
| Unsupported input | 36V input batteries are not supported |
| 12V start threshold | Above 13.8V |
| 12V stop threshold | Below 13.0V |
| 24V start threshold | Above 26.8V |
| 24V stop threshold | Below 25.2V |
| Published input-current rating | Not listed on the current product page |
| Auxiliary Outputs | |
| 12V output bank | 12V / 10A |
| 36V output bank | 36V / 10A |
| Approximate nominal output power | 12V bank ≈120W; 36V bank ≈360W; aggregate ≈480W before conversion losses |
| 12V output purpose | Separate 12V auxiliary, house, electronics, or secondary battery |
| 36V output purpose | Separate compatible 36V auxiliary or trolling-motor battery |
| Same-battery loopback | Do not connect the 12V output back to the starter battery used as the input source |
| Battery Compatibility and Controls | |
| 12V bank chemistry modes | 12V LiFePO4, 12V lead-acid, or 12V AGM |
| 36V bank chemistry modes | 36V LiFePO4, 36V lead-acid, or 36V AGM |
| Mode selection | Separate front-panel MODE controls for the output banks |
| Mode-change rule | Select before charging; disconnect that bank's output ring terminals before changing chemistry |
| Lithium BMS activation | Select LiFePO4 and hold the applicable MODE control for approximately 3 seconds |
| Cold-weather lithium charging | Do not charge below 0°C / 32°F unless the battery has approved heating or manufacturer permission |
| Operating Logic and Indicators | |
| Automatic source detection | Starts and stops according to detected 12V or 24V source voltage |
| Idle / hibernation | Enters hibernation after approximately 20 minutes at idle while monitoring input voltage |
| Manual power control | Hold MODE for 6 seconds to turn off; short-press MODE to wake |
| Normal charge indication | POWER solid green; CHARGING solid red |
| Full-charge indication | POWER and CHARGING LEDs solid green |
| Other indicators | Selected battery chemistry and reverse-polarity status |
| Connections and Isolation | |
| Input connection | Pre-wired ring-terminal leads; red positive and black negative |
| 12V output connection | Pre-wired ring-terminal leads; red positive and black negative |
| 36V output connection | Pre-wired ring-terminal leads; red positive and black negative |
| Connection groups | One input pair plus one 12V output pair plus one 36V output pair |
| Isolation | Non-isolated |
| Wiring boundary | Red and black leads within the same cable jacket must connect to the same battery |
| Grounding warning | A black lead must never be connected to a terminal carrying red leads |
| Network requirement | No published NMEA 2000 or proprietary data-network requirement |
| Protection and Cooling | |
| Short-circuit protection | Yes |
| Reverse-connection protection | Yes |
| Overcharge protection | Yes |
| Overtemperature protection | Yes |
| Housing | Aluminum housing with bottom aluminum cooling plate |
| Cooling | Waterproof cooling fan; not fanless |
| 12V bank replacement fuse | 15A |
| 36V bank replacement fuse | 15A |
| Environmental and Mechanical | |
| Ingress protection | IP67; enclosure filled with pure epoxy resin |
| Working temperature | -20°C to 40°C / -4°F to 104°F |
| Nominal working temperature | 25°C / 77°F |
| Product dimensions | 250 × 149 × 68mm / approximately 9.84 × 5.87 × 2.68 in |
| Mounting holes | 6.5mm |
| Recommended fasteners | M6 screws appropriate for the mounting surface |
| Required clearance | More than 30mm; do not block the fan or cooling surfaces |
| Published weight | Not listed on the current product page |
| Installation Boundaries | |
| Alternator compatibility | Verify rated output and available charging current after all existing boat loads |
| Source-side demand | Can be substantial because the two outputs total approximately 480W before conversion losses |
| Series-built 36V bank | Follow the battery manufacturer's approved charging and balancing method |
| Dockside charging | DC-to-DC charging supplements but does not replace a full AC recharge |
| Ingress caution | Do not intentionally submerge; protect ring terminals, cables, and connections |
| System protection | Use appropriate fusing, disconnects, conductor sizing, grounding, and marine installation practices |
Alternator and marine installation note
Regulated charging does not remove the need to engineer the complete source and auxiliary circuits.
Verify source-system output, battery condition, fusing, cable ampacity, voltage drop, grounding, mounting, ventilation, chemistry settings, and auxiliary-battery limits. Disconnect and isolate all batteries before service. Never charge a frozen, damaged, or unsupported battery, and do not treat IP67 as permission for permanent submersion.
Dual-bank DC-to-DC output visualizer
One starter system. Two independently regulated battery outputs.
A compatible 12V or 24V starter-battery source feeds one charger that separately manages a 12V auxiliary bank at up to 10A and a 36V auxiliary bank at up to 10A.
12V / 24VStarter-battery source
13–30VAccepted DC input range
12V / 10AIndependent output bank 1
36V / 10AIndependent output bank 2
Published output ratings
Two different voltage banks
Each voltage belongs to its own output leads and its own connected auxiliary battery.
Maximum rated output current
Equal current ratings, separate control
The ratings describe two independent 10A outputs—not one combined 20A battery output.
Illustrative operating snapshots
Independent means the banks do not have to taper or finish together.
Each bank responds to its own connected battery. One output can remain active while the other reduces current or completes charging.
Example ADifferent charging demand
12V bank
9A active
36V bank
4A tapering
Example BOne bank completes first
12V bank
Complete
36V bank
10A active
Example currents above are hypothetical and only illustrate independent regulation; they are not a recorded charge test.
Automatic source-battery control
Start and stop thresholds depend on the source system.
The charger begins after alternator-raised source voltage crosses the applicable start point and stops as source voltage falls below the corresponding stop point.
12V source system13.0V ↔ 13.8V
0.8V switching gap
STOP
SWITCHING GAP
START / RUN
13.0V
13.8V
Stops below 13.0VStarts above 13.8V
24V source system25.2V ↔ 26.8V
1.6V switching gap
STOP
SWITCHING GAP
START / RUN
25.2V
26.8V
Stops below 25.2VStarts above 26.8V
12V auxiliary bank
Independent 12V / 10A output with selectable LiFePO4, AGM, and lead-acid modes.
36V auxiliary bank
Independent 36V / 10A output with selectable LiFePO4, AGM, and lead-acid modes.
Source and wiring
Use a compatible 12V or 24V starter source. The charger is non-isolated, and a 36V battery is not supported as its input.
Visual compares published nominal output ratings and illustrates independent regulation. It is not a measured voltage/current/time charging curve. The two 10A figures are output-bank ratings; starter-side current varies with source voltage, battery demand, conversion efficiency, and operating conditions.
Frequently asked questions
Dual-Output 12V/36V DC-to-DC Charger FAQs
Common questions about both outputs, starter-battery reserve, alternator capacity, isolation, battery chemistry, cooling, and onboard mounting.
How does the dual-output 12V/36V “charge on the run” system work?
The charger draws from a compatible 12V or 24V starter-battery system and manages two separate auxiliary outputs: one 12V / 10A bank and one 36V / 10A bank. It monitors source voltage and begins charging when the source rises above the published engine-running threshold. This allows a separate 12V auxiliary battery and a 36V trolling-motor battery to receive regulated charging from one onboard unit.
Does the 12V output charge the same starter battery used as the input?
No. The starter battery or starter-battery system is the input source. The 12V output is intended for a separate 12V auxiliary, house, electronics, or secondary battery. Do not loop the 12V output back to the same battery used as the charger input.
Will the 36V output drain my starting battery while I am fishing?
The automatic voltage thresholds are designed to stop both auxiliary outputs when source voltage falls below the published cutoff. With a 12V source, charging starts above 13.8V and stops below 13.0V; with a 24V source, it starts above 26.8V and stops below 25.2V. The charger also hibernates after about 20 idle minutes while continuing to monitor source voltage. A healthy starter battery and properly sized alternator are still required.
Can I use a 24V starter-battery system as the charger input?
Yes. Epoch publishes a 13–30VDC input range for compatible 12V or 24V starter systems. A 36V battery is not supported as the input source. Verify the source system, polarity, fusing, grounding, and alternator capacity before installation.
Can I use the 36V output on three 12V batteries wired in series?
Epoch publishes the 36V output for one compatible 36V battery. A three-battery 12V series string may require individual-bank charging and balancing under the battery manufacturer's instructions. Do not assume that charging only across the full 36V string will keep all three 12V batteries balanced.
Does this replace my plug-in AC onboard charger?
No. The DC-to-DC charger supplements energy while the source charging system is active. Its outputs are limited to 12V / 10A and 36V / 10A, so a short engine run may replace only part of the energy used. A compatible AC onboard charger is still recommended for a complete dockside recharge and periodic balancing.
Will this charger protect every outboard alternator from overload?
The charger regulates its auxiliary outputs instead of connecting the battery banks directly, but universal alternator compatibility cannot be assumed. The two outputs represent up to approximately 480W of nominal charging power before conversion losses, so source-side current on a 12V system can be substantial. Verify alternator output, existing boat loads, cable size, fusing, voltage drop, and available charging margin.
Is this an isolated DC-to-DC charger?
No. Epoch lists the CHG-DC-12V36V as non-isolated. Automatic voltage sensing is not galvanic isolation. Connect every red and black pair exactly as shown in the supplied diagram, plan the common-ground architecture correctly, and use appropriate fusing and conductor protection.
Can each output charge lithium, AGM, or lead-acid batteries?
Yes. The 12V and 36V output banks each support selectable LiFePO4, lead-acid, and AGM modes. Use the MODE control for the applicable bank before charging. A bank's chemistry setting cannot be changed while it is charging; disconnect that bank's output ring terminals before selecting a different mode.
Is the charger fanless?
No. The charger uses an aluminum housing and bottom cooling plate together with a waterproof cooling fan. Maintain more than 30mm of clearance and keep the fan and heat-dissipation surfaces unobstructed.
Can I mount the charger in a wet bilge compartment?
The enclosure is epoxy-filled and rated IP67, but the ring terminals, cables, and connections still require protection. Do not intentionally submerge the charger. Mount it securely in a protected, ventilated location where the fan, glands, terminals, and wiring can be inspected.
Can it wake a deeply discharged lithium battery?
Yes, for a compatible sleeping LiFePO4 battery. Select LiFePO4 on the applicable output bank and hold its MODE button for approximately three seconds until the charging indicator responds. BMS activation cannot repair a damaged, frozen, or unsafe battery.
Can I charge a frozen LiFePO4 battery?
No. Do not charge LiFePO4 below 0°C / 32°F unless the battery has an approved internal heating system or its manufacturer specifically permits below-freezing charging. The charger's operating-temperature range does not override the battery's low-temperature charging limit.
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