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Solar Torch Electronic Design Problems

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uksnowman

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Hi Everybody

My knowledge of electronics is quite limited and was wondering if anybody can help me out.

I want to build a Solar Torch, however have been banging my head against the wall with respect to the electronics deisgn.

The solar cells will charge a Lithium Ion battery and the battery will power my LED array (5 LED's).

Very simple idea but have had complications with the charging circuits for Lithium Ion batteries.

I need a 6V supply for my LED array which draws 240mA and therfore the obvious choice would be a 7.2V Li Ion battery, however, I appreciate I need a protection PCB to prevent over charging and discharging.

The batteries I have looked at which have protection PCB's/IC's have overdischarge limits set in the region of 4V which leaves me 2V short of my required supply voltage.

Am I correct in thinking that I need to utilise a 11.1V Lithium Ion battery which has a protection PCB which limits over discharge voltage to 9V and then regulate this there after to my 6V?

Can anybody recomend an electronics outlet where I can by small solar cells and Lithium Ion Batteries with integrated protection circuits? I have spent alot of time on Battery Space but is quite expensive with respect to shipping.

Any help with the above would be very much appreciated.

Kind regards

Matt
 
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