Famas solar panel aa charger

[Famas]

basically im trying to make a solar panel charger i want it to have 2 aa inside the case too recieve the charge from the solar panels and to connect to a usb that i can use to charge anything that takes a usb so ive done my research and the solar panels give 1.5-2v each heres some pics ive struggling getting voltage when connecting the solar panels toghether

[frenulem - No.5417]

first thing is usb takes 5v and 2 AA's give out 3v

[Famas]

yes but the 2 aa give out 3v and the 2 solar panels give out 2v each so will this not work

[frenulem - No.5417]

well if the solar panels aren't charging the bats and have full light, i'd just shove another AA in there to be safe

[Famas]

could you show us a diagram or anything will i need diodes and resistors and could i make a led to show its charging

[frenulem - No.5417]

ok, you will need a diode, see what i can do about the diagram, just bout to jump in the shower

[Famas]

fren you done that diagram nothing im doing is working here constant 1.5v not double witch is 3

[frenulem - No.5417]

http://www.reuk.co.uk/Solar-Battery-Charging.htm use that, it's a good way of doing it

[crazy-modder]

Heres a really basic setup. I based it off of the above link.

[Famas]

thanks crazy here it is

[hyper999]

ah ok so you have a charger that runs off usb i see

so basically what you are trying to achieve is a solar powered usb port

so you need 5v, but you say that you have 2 solar panels and they only put out a max of 2v each, yes? well this means you are gonna need a boost regulator circuit like this
http://www.ladyada.net/make/mintyboost/
or more/different solar panels and a shunt regualtor

[Famas]

already works will charge 1 battery with led on or 2 with led off

solar panel usb charger


hopefully this has finished processing

[hyper999]

ok fair enough if its working off 4/3volts but you may want to consider the above improvements for better operation in the future

[Famas]

you will have to click the video link to watch it sorry guys

[geraldrubalcava]

first off, if you use anyother type of battery exept for lithium, then the solar panel i a good idea. beween each panel you should put a diode. because solar panels tend to drain electricity when not in full potential. your diagram is correct. but add a extra diode between panels, also what is your mA capacity of your batteries? how much mA does these panels produce? if you do exactly how your diagram shown then trickle charging will work.
Post Merge: February 14, 2011, 11:07:31 PMalso if charging 1.2v battery @ 200mA with a solar powered panes then i suggest having a inverter like how hyper999 discribed. a while ago i got a solar power car charger that plugs into the "accesory" outlet in a car. this panel has a surface  area about 8in x 12in. and gives off 18v @ 200mA but they are all connected in series. but if i were you i would prob connect them in parallel for trickle charging and if you are going to use a inverter or more than one battery at a time then wire it in series