Join Date: Oct 2006
Thanked 0 Times in 0 Posts
Rep Power: 0
I have 2 batteries 12 volt that are sperated by a standard switch on every boat. You know the one it's red and reads battery one, battery two, both, and off.
I have a 30 watt solar panel and bought the cheapest charge controller on the market, I think it was $26. I ran the solar panel to the controller and the controller to my biggest battery of the two, which happens to be battery 2. during the day or when I think about it, I switch the battery switch to both and let the charger charge both batteries.
I only recommend this technique if you have one battery that is sort of old and the one you use as the sacrificial battery. Like when your sailing at night and running lights, you use it, when the lights go dead you go opps, and switch to the 2nd battery start the engine to charge things up.
However I will soon invest several hundred dollars in an expensive 48v system and then I will be using a much better charge controller and doing all the things that the nice sales man recommends.
But for now this has served me very well and both batteries hold a charge and work great... used them all summer, I was a live aboard. Never actually turned the engine on till this fall. 30 watt panel sitting in the sun all day gave me plenty for lights at night, and chargeing the gadgets. Great investment! would have spent more in gasoline.