I just bought a 12V solar trickle charger:http://www.amazon.co.uk/Solar-Briefcase ... sim_auto_8
I took it outside, it's a sunny day today, and measured the voltage.
It's a steady 19.8V
Although I'm starting to get a feel for battery tech after learning about LiPo for my ebike, I don't understand why the voltage output from this unit is so high.
Can someone explain why its OK to charge a '12V' battery at 19.8V ?
I realise that 12V is nominal and reality will be higher, maybe 13-14V.
Presumably it's to do with inefficiencies in the trickle charging process?