Originally Posted by starnetman2001
I fitted a solar panel. It's about 500x800mm so not small but can charge an empty to full battery in about a week.
That may sound slow but it keeps the battery charged and electrics working when engine off.
Battery is changed every 2 years and I've never had a flat
I use one of those (smaller though) in the missus' car, which goes flat every 3 weeks without it! they are pretty cheap if you google them, and work well.
We have the same arrangement on our rescue boats on board the ship, and it keeps the batteries topped up so they do not need charging at all. A regular replacement (every 2 years) is all we do.
They are monted on top of the righting chamber (on top of the a frame)