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will this work for a cell phone solar charge? Answered


i came up with this idea after looking at a lot of instructables on solar cell phone chargers all using a usb port and thought that having a 12v port would be a more flexible charging device for more than just a usb type device.I got the idea after looking at this schematic http://i27.tinypic.com/n4xq4x.jpg and thought  that lithium ion battery would be a better idea (lighter weight and more powerful)than AA batteries I'm planning on using three 3.7 Li-ion Nokia cell phone batteries wired in series in conjunction with a 12v solar cell ,a blocking diode, battery pack  then a cigarette lighter receptacle  to plug a car phone charger into see attached illustration 

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frollard

7 years ago

it'll work, but you REALLY want to be careful about over/under charging. Look up lithium protection circuit, and you should be golden -- when lithiums fail they fail spectacularly.

My only other concern would be that 3series lithiums will be poorly balanced -- if they start with one having more charge, by the time the others catch up, that one is overcharged. It can cause quite the problem with firey explosions.

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ARJOONfrollard

Answer 7 years ago

you got the point but if we charge them seperately and adding regulatotr and diodes diodes for paralell and series connection

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frollardARJOON

Answer 7 years ago

but if you charge them separately, you waste most of the 12v from the panel.