A DC-to-DC charger uses excess engine-alternator current, typically redirected from the starting battery bank, to charge the house battery bank. This can also be performed by an automatic charging ...

The $599 Alternator Charger sits between the starter battery on your RV, van, or truck and the giant EcoFlow battery you use to power your work and play when off the grid. It charges at a rate of 1kWh ...