T o d d P a t t i s t wrote:
snip

One option, if you want to keep your current 12 volt solar
cell system would be to buy a 12 volt DC to 120 volt AC
inverter and plug in a regular 12 volt charger. It's not
elegant or efficient, but it should work.

It depends very much on the particular inverter and charger, because
they are often marginally compatible; for example, I have a 300 watt
inverter that powers my 1 amp charger to about half output. So, test
before you buy an inverter, if you can.

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Eric Greenwell
Washington State
USA