DC-DC Chargers

Charge the House Bank While You Drive

A simple isolator dumps raw alternator voltage into your auxiliary battery bank and hopes for the best. These DC to DC battery chargers from Rich Solar and Victron Energy do the job correctly. They take power from the starter system, shape it into a proper multi-stage charge, and keep the house bank—lithium or lead-acid—healthy while you roll. RVs, vans, overland rigs, and boats arrive with more usable power, and an alternator that didn't get overworked.

Shop 12V and 24V models from 15A to 60A, plus a 50A charger that also harvests solar. Pair the current to your alternator size, then charge on every trip instead of waiting for shore power or a generator.

Charge Lithium and Lead-Acid the Right Way

House batteries fail early when they see wild voltage from a modern smart alternator. A DC-DC charger isolates that chaos and applies the profile your chemistry actually needs.

• True multi-stage charging — Bulk, absorption, and float bring AGM, gel, flooded, and LiFePO4 banks to a full, stable charge instead of a partial top-off.
• Starter-battery protection — Current is drawn only when the vehicle electrical system can spare it, so you do not walk back to a dead chassis battery.
• Lithium-ready profiles — Dedicated LiFePO4 and lithium-ion modes, plus automatic lithium activation on Rich Solar units to wake a pack that has dropped into protection.
• Alternator-friendly current control — Rich Solar current-limit mode cuts output in half when you want less strain. Victron Orion-Tr Smart units can run in parallel when one 30A charger is not enough.
• Solar and driving power in one box — The Rich Solar 50A DC-DC + MPPT controller charges from the alternator and from the roof at the same time, with priority settings you control.

Pick the Charger That Fits the Rig

Voltage and amperage have to match the vehicle and the house bank. This category covers the common dual-battery layouts:

• Rich Solar 12V DC-DC chargers — 20A, 40A, and 60A models for 12V vans, campers, and boats. Chemistry presets, power-supply mode, and a rugged metal enclosure with cooling fans.
• Rich Solar 50A DC-DC + MPPT — 12V or 24V vehicle input, 12V house output, and up to 800W of solar on a second input. LCD, Bluetooth, and wired monitoring keep the whole system visible.
• Victron Orion-Tr Smart chargers — 12V-to-12V 30A, 12V-to-24V 15A, 24V-to-24V 17A, and 24V-to-12V 30A. Built-in Bluetooth connects to VictronConnect so you can set profiles, watch current, and update firmware from your phone.

Use a 12-to-12 charger when both batteries share the same voltage. Choose 12-to-24 or 24-to-12 when the house bank and the chassis do not match.

Arrive With Power Instead of a Dead Bank

Weekend campers stop running the generator just to recover from the drive. Full-time van builders keep lithium packs inside a safe charge window mile after mile. Marine crews top the service bank underway without cooking gel or AGM cells. Pair the charger with the battery chemistry you already run, set the profile once, and let every trip do the charging work.

Browse Rich Solar and Victron DC to DC battery chargers, match 12V or 24V to your dual-battery system, and start filling the house bank the moment the engine fires. Shop the collection now and turn drive time into stored energy.