Best 40 A and Up DC-DC Chargers Ranked

The best all-round alternator charger for most vans and RVs with a 12 V lithium bank. It is small, very efficient and fully configurable from a phone.

For mixed voltage setups, such as a 24 V truck charging a 12 V camper bank or a 12 V van with a 24 V house system.

For boats, trucks and engine bay installs that need a sealed charger with solar and Bluetooth.

For an RV owner building a REGO system who wants Bluetooth and RV-C built in. Otherwise the plain 60 A model is far cheaper.

For a large lithium bank charged from a conventional high output alternator, at a low price.

For big lithium banks on a budget, where raw current matters more than features. The short warranty and thin spec sheet are the trade-off.

For boats and big RV banks that need lots of alternator current and fine control over charge voltages. Van builders short on space will find the Orion XS smaller and easier.

The value pick for vans and campers that want alternator and solar charging in one box. It costs well under half as much as a Redarc dual-input unit for more current.

For boats and large RVs with a big lithium bank and an alternator rated well above 140 A.

For a budget build where price matters most and the vehicle has a conventional alternator.

A low cost dual input charger for a small van with a couple of 12 V panels and a lithium battery.

A cheap dual input charger for a van with a 200 Ah lithium bank and a modest solar array.

For budget van and trailer builds that want alternator and solar charging in one cheap box. Specs are thin, so pick it on price rather than features.

A cheap, quiet way to add alternator charging to a van or camper with a lithium house battery. Pay more for Victron if you want built-in Bluetooth.

For boats and large RVs with a big lithium bank and an alternator rated well above 90 A.

A bare-bones, low-cost alternator charger for a lithium house battery in an RV or van. Spend more for smart-alternator details, monitoring or a solar input.

For RV owners who want 50 A and a wired remote display without paying Victron or Redarc prices. The short warranty and one-source-at-a-time design hold it back.

A very cheap way to try alternator charging on an older vehicle, if the third party listing holds up.

For 4x4 and truck builds that need the toughest sealed charger with Bluetooth. Buyers on a budget get more amps per dollar elsewhere.

For a big lithium bank in a 4x4 or truck where the charger must sit in the engine bay. Expensive for what it does.

For boats and vans where keeping the start battery charged matters as much as the house bank.

For overlanders who want a tough, potted charger that can live in the engine bay and take solar too. Buyers mounting inside the cabin can get similar charging for much less.