Thursday, Nov 22, 2012 at 09:22
.
Mark, you can charge both batteries from the solar panel, but as I said, it complicates your electrical system, and for little gain.
In any case, despite some idealistic proponents of the idea, there is little real savings in fuel to be had. Provided that you are not placing significant accessory loads on the cranking battery, the only consumption from the cranking battery requiring recharge is from the starter motor. The actual ampere hours consumed during a normal start of a healthy engine is actually quite small and this is replaced within a short time of driving following the start. So when the vehicle is parked after driving for a while the cranking battery is fully charged and therefore will not be seeking any significant charge from the solar panel.
FollowupID:
774979