The Thunder 20A DC/DC Charger is an easy to install smart charger that can quickly charge your batteries from your vehicle battery connections or solar panel.

The charger has the intelligence to determine the best charge rate for your batteries (excluding lithium) and automatically switch to solar input (if connected) in the event the vehicle battery is turned off or voltage drops below 11.9V, protecting you against battery damage or even worse, a dead battery when you least need it.