Hawk, I know it’s a bit of a tangent - but it is the campfire. Are there any solar systems which you are familiar with which would reasonably provide a trickle charge to maintain marine deep cycle batteries over periods of non-use?
Most of them will, the problem is the sun! But you did say the magic words of "periods of non-use".
Even the simple systems will work decently in that application, just make sure they are fully charged before and you should be fine,
Wet, fully charged batteries will sit stationary from 3-8 months stationary, depending on storage temp. Agm's 8 months beyond a year.
