Dual-Output 12V/36V Marine DC-DC Charger | Charge on the Run

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.