The Enerdrive | Dometic ePOWER DC2DC 40A+ Battery Charger is a fully automatic multistage, multi-input battery charger with the ability to charge from either an alternator linked to a battery; or via solar power with the in built Maximum Power Point Tracking (MPPT) Solar Controller. With two inputs available, the main/house battery will be charged from either the engine while underway, or via the solar panels when stationary. The process to choose either engine or solar is fully automatic and both functions are controlled from within the unit itself without the need for external relays. Downloads DC2DC+ User Manual Rev 1.2 DC2DC+ Appendix A1 DC2DC+ Appendix A2 DC2DC+ Appendix A3 ePOWER DC2DC In Vehicle/Marine Wiring Diagram ePOWER DC2DC Towed Vehicle Wiring Diagram ePOWER DC2DC Plus Brochure Smart Alternator/Relay Wiring setup for DC2DC Charger DC2DC Remote Panel Install/Operations Manual