solar powered lights
Usually cheap crap from a hardware stores, they never do last.
I've been living off solar for 11 years and haven't seen a spec of mould yet. I built an entire motorhome (well 98% of it), welding, power tools the lot using just solar.
it takes time to charge batteries so if you don't want them to get hot then don't charge them in the sun.
Eh? You don't put the batteries in the sun, just the panels.
Batteries need to be replaced every three to five years
That's the conventional wisdom but I have friends still on their first set after 12 years.
Solar isn't perfect and we have a backup generator, but it does work and should do for 20 years or more.