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ePOWER DC2DC+ 40A — 12V DC-DC Charger with MPPT Solar Input
EN3DC40+
Dual-input 12V DC-DC charger with built-in MPPT solar regulator. 40A output, lithium-ready, charges from alternator and solar together. Fits caravans, campers, 4WDs, boats and off-grid cabins.
$575.00
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A dual-input DC-DC charger that pulls charge off the alternator and off a solar array at the same time, routes it through a 3-stage MPPT regulator and feeds a 12V house battery. Fits caravans, camper trailers, 4WD tourers, motorhomes, boats and off-grid cabins where the house battery runs a fridge, lights, water pump and inverter and needs to keep charging whether the engine is running or the sun is up.
The 242 by 172 by 74mm aluminium chassis carries M6 output terminals, a thermo-controlled fan and a programmable LCD. The alternator input accepts 10.5 to 16V DC on 12V vehicles or 21 to 32V DC on 24V vehicles, auto-selects between sources and prioritises solar when both are active. The MPPT solar input accepts 14.5 to 45V open-circuit panels up to 800W, and battery profiles cover Gel, AGM, Flooded, Lithium and fully programmable.
Mount the charger inside the cabin, in a vented cupboard or under a protected canopy. The chassis isn't sealed, so engine-bay heat, grit and water will shorten its life. Fuse the alternator input and the battery output per the install guide, and run cable that handles a sustained 40A draw at the length you've got.
What sets it apart
Two inputs, one output — alternator and MPPT solar feed the same house battery, and the charger decides which one to use.
Solar priority — when both sources are active, it draws from solar first and tops up from the alternator only when it has to.
Big solar headroom — the MPPT accepts up to 800W of panel, so a full roof array goes straight in without a separate regulator.
Fully programmable profiles — Gel, AGM, Flooded, Lithium and a custom profile all sit on the front panel.
12V and 24V alternator ready — one unit covers single-cab utes, light trucks and buses on either system.
Thermo-controlled fan — stays quiet at idle and ramps up only when the chassis gets hot under full load.
Mounting and install
Mount flat on a bulkhead or shelf with the vents clear and at least 50mm of airspace around all sides. Keep it inside the cabin, in a sealed cupboard, under a dash or in a covered canopy, not in the engine bay. Run heavy cable on both the alternator and battery sides and fuse each side at its own end.
The unit works out of the box on default profiles, but hold the included battery temperature sensor against the side of the house battery for cold or hot environments. Set the chemistry on the LCD before first charge if the house battery is anything other than AGM.
- Dual-input charging — alternator and MPPT solar at the same time
- Up to 800W solar — large roof arrays go straight in
- Solar priority — uses sun first, saves alternator fuel
- Lithium-ready — Gel, AGM, Flooded and custom profiles
- 12V or 24V alternator — one unit fits most tow vehicles
- Programmable LCD — read charge state and set voltages live
- Thermo-controlled fan — quiet at idle, ramps only under load
- Temperature sensor included — compensates in cold or hot batteries
Electrical
Output voltage: 12V DC
Output current: 40–50A
Output power: 775W
Charger range: 13.8–15.5V
Float range: 13.0–13.8V
Efficiency: 95%
Alternator input
12V input: 10.5–16V DC
24V input: 21–32V DC
Solar input
Regulator: MPPT
Panel voltage: 14.5–45Voc
Max power: Up to 800W
Charging
Stages: 2 or 3
Chemistries: 5-profile
Temp sensor: Included
