12V 30A DC-DC On-Board Battery Charger with MPPT
Sold by Renogy UK
From £169.99across the range: £169.99 – £179.99
Renogy UK's price when we last checked, on 2 September 2026. They run promotions and price by variant, so confirm the current price on their page before you buy.
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Overview
12V 30A DC-DC On-Board Battery Charger with MPPT
30A of alternator charging and an MPPT solar controller in one box. Two charge sources, one unit, one set of cable runs to the battery — the reason this is the most popular shape of charger in van conversions.
- 30A maximum output, 400W
- Dual input, alternator and built-in MPPT solar
- Euro 6 smart alternators, 12–16V input; traditional 13.2–16V
- 94% charging efficiency
- RS485, Bluetooth module available
- 1.41kg, 244 × 146 × 77mm, −35°C to 65°C
One box instead of two
The alternative is a separate DC-DC charger and a separate solar controller, each with its own pair of heavy cables to the battery and its own fusing. Combining them saves a run, saves a fuse pair, and — more usefully — means one device is arbitrating between the two sources rather than two devices both trying to hold the bus voltage.
Where 30A lands
30A suits a 100–200Ah bank. Below that you are over-specified; much above it and a day's driving stops making a meaningful dent, at which point the 50A is the better buy. Terminals take 8AWG to 4AWG, which is the right range for a typical cab-to-habitation run.
Before you order
Fusing is specified at 75–100A on both input and output — heavier than the 20A unit, so plan the cable accordingly. The wide −35°C to 65°C operating range means it is happy in an unheated locker even if the battery it feeds is not.
Renogy's published figures
Taken from Renogy's own specification for this product, on the date shown by the price. Anything wired into 230V mains should be signed off by a qualified electrician.
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