I am interested in building solar panels for my own use. I think an output of around 20 watts will be sufficient for my purpose if I can tie them together and charge deep cycle batteries. Need the plans for dummies as I know nothing about these things.Thanks for any help you can provide me!

I am looking into buying a portable solar charger for my laptop, but can’t find any information on how long these products are supposed to last. I know thin film panels usually only have warranties for 5-10 years in normal solar panels (versus longer lifespans with the crystalline panels). I don’t know how to translate that information into making a purchase, though.

Does anyone know of a clearinghouse of information on portable solar chargers?

Any information you could provide would be greatly appreciated.

Or where to find the cheapest. I am building an outside toilet are to be encased in a porch. I want the water to be totally solar heated and might want use underfloor heating from the same source.
Forgot to say I am UK based