Collection: Charge While You Drive — DC-DC Kit

A tow vehicle's 7-pin will trickle a few amps into the house battery and no more, and on a modern smart alternator it may put in nothing at all. A DC-DC charger takes the alternator's output and charges the house bank at a real rate on the right profile — 50A here, which is roughly 600W of charging for every hour you drive. The shunt tells you whether it is working.

This collection holds every part in the kit so you can swap a size before you buy. The whole kit, priced and loaded in one click, is on the RV power bundles page.