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The Epoch Dual-Output 12V/36V Marine DC-to-DC Charger charges a separate 12V auxiliary battery and a 36V trolling-motor battery from one compatible 12V or 24V starter-battery system, turning 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. At a glance: 12V / 24V source input, 12V / 10A output bank 1, 36V / 10A output bank 2, 2 independent banks, IP67 enclosure, non-isolated architecture.
Key Features
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Dual-output charging: 12V and 36V auxiliary banks.
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Voltage-sensing control: Automatic start and stop.
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Three chemistry modes: LiFePO4, lead-acid, and AGM.
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Lithium activation: Wakes a compatible BMS.
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Active cooling: Aluminum housing plus a waterproof fan.
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Built-in protection: Short-circuit, reverse-connection, overtemperature, and overcharge protection.
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.
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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.
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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.
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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.
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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.
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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.
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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.
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.
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12V / 24V: Starter-battery source
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13–30V: Accepted DC input range
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12V / 10A: Independent output bank 1
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36V / 10A: Independent output bank 2
Charger features
- 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
- 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.
Suitable For:
- 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
Compare
| Source system |
Stop below |
Start above |
Switching gap |
| 12V starter system |
13.0V |
13.8V |
0.8V |
| 24V starter system |
25.2V |
26.8V |
1.6V |
Certifications & Standards
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IP67: Pure epoxy filling gives the enclosure a high ingress-protection rating for correctly installed onboard use; it is not permission for intentional or permanent submersion.
Please Note: The 12V output is for a separate auxiliary battery, never the starter battery used as the input.
Please Note: Supplements, but does not replace, a full dockside AC recharge and periodic balancing.
Please Note: A 36V battery is not supported as the input source.
Please Note: Non-isolated: follow the supplied wiring diagram for polarity, grounding, and fusing.
Please Note: Verify alternator capacity; combined output is about 480W before losses, so 12V-side current can be substantial.
Please Note: Do not charge LiFePO4 below 0°C / 32°F unless the battery has approved heating or manufacturer permission. Do not intentionally submerge.
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Specifications
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: Not listed on the product page
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
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
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
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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.
- Do not connect the 12V output back to the starter battery used as the input source.
- Select each bank's chemistry before charging; disconnect that bank's output ring terminals before changing it.
- Mount on a rigid surface using the 6.5mm mounting holes (M6 fasteners recommended), keep more than 30mm of clearance, and protect every lead from vibration, abrasion, heat, and sharp edges.
- Follow the supplied wiring diagram exactly.
How it works: one source, two independent banks
- Connect one source system: a 12V starter system (charging starts above 13.8V, stops below 13.0V, a 0.8V switching gap) or a 24V starter system (starts above 26.8V, stops below 25.2V, a 1.6V switching gap). The charger begins after alternator-raised source voltage crosses the start point and stops as source voltage falls below the stop point.
- Independent bank 1: 12V / 10A output for a 12V auxiliary battery, with selectable LiFePO4, AGM, and lead-acid modes.
- Independent bank 2: 36V / 10A output for a 36V auxiliary battery, with selectable LiFePO4, AGM, and lead-acid modes.
- Each voltage belongs to its own output leads and its own connected auxiliary battery. The ratings describe two independent 10A outputs, not one combined 20A battery output.
- 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. (Epoch's illustrative examples, not measured data: 12V bank at 9A while the 36V bank tapers at 4A; or the 12V bank complete while the 36V bank runs at 10A.)
- 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.
- These figures compare published nominal output ratings and illustrate independent regulation; they are not a measured voltage, current, or time charging curve. Starter-side current varies with source voltage, battery demand, conversion efficiency, and operating conditions.
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CHG-DC-36V / CHG-DC-12V36V User Manual
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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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Epoch Batteries Limited Warranty
Warranty Period
2-year limited warranty on Epoch-branded chargers (Epoch general warranty terms)
Epoch Batteries-branded products are covered against qualifying defects in materials and workmanship for the applicable warranty period, subject to Epoch's model-specific remedy schedule and the terms of its warranty policy. Epoch-branded chargers carry a 2-year limited warranty and accessories (such as fuel gauges and voltage reducers) a 1-year limited warranty, from the original purchase date.
Registration
Register your battery with Epoch within 90 days of purchase for full warranty coverage. If it is not registered within that time, the warranty period begins from the battery's original manufacturing date. Proof of ownership is required for any claim, and coverage is non-transferable and applies only to the original purchaser.
Remedy
After inspection and testing, Epoch will provide the applicable remedy for a qualifying manufacturing defect: an approved repair, a replacement, or a comparable-product offer according to the model's schedule. Typical repair turnaround is 3–10 business days once the product is received.
Exclusions
Coverage may be denied when a failure is caused by misuse, improper handling, installation or storage, or use outside the product's specifications. Examples include an unsecured battery; loose, corroded or improperly connected terminals; series or parallel connections beyond the manufacturer's recommendations; reverse polarity or short circuits; impact, fire or water submersion; storage above 140°F or below -40°F; prolonged storage fully discharged or batteries left uncharged for more than three months; poor crimps, undersized cables or damaged wiring; opened, modified or tampered products; and use in applications the battery was not designed for, including repeated engine starting on non-cranking models.
Obtaining Warranty Service
Start a claim through the Epoch Batteries Warranty Portal with your model and serial number, proof of purchase, a description of the issue and supporting photos or videos. If approved, Epoch provides an RMA number and packing instructions. Do not ship a product without a valid RMA. The customer arranges and pays for shipment to Epoch, packaged in compliance with lithium battery shipping rules. Epoch Batteries can be reached at 1-888-501-1846 or support@epochbatteries.com.
Visit Epoch's Warranty Page to review the full warranty terms.
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Shipping is typically through freight carriers and the actual shipping time is contingent on your location and the specific warehouse dispatching your order. Please allow for a 1-3 business day processing period before shipment, and an estimated delivery time of up to 7 business days. Your confirmation email will include delivery details and we will send you a tracking number as soon as one is available. If you ordered several separate items, you may receive multiple tracking numbers. Once the item has been shipped, the freight service will contact you to coordinate the date and time of delivery. If you require any special accommodations during delivery please let us know as soon as possible and let the delivery company know when arranging the appointment.
Typically, orders will be dropped off either curbside or outside your front door or garage. It is your responsibility to bring the order inside or to its final destination and to remove any existing items.
Depending on the item, parts may be shipped in multiple boxes, and assembly may be required. When your order is delivered, please check that you have all pieces of the item and that nothing is damaged. If your order is damaged during transit and external damage is visible, note the damage immediately, write it on the delivery documents, take photos and/or videos, and refuse shipment. If there is no visible external damage, accept the package but note “subject to concealed damage” on the delivery documents. Any damage upon delivery needs to be reported within 24 hours of delivery or you may not be eligible for a refund. For additional information on submitting claims, as well as incorrect item exchanges, and replacements, please see our Refund Policy.
For more information about shipping, please visit our complete Shipping Policy.
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