Re: Solar Powered Li-Ion Battery Charger


"Ray D."

I'm going to be building a solar powered Li-Ion battery charger for a
class project, and I just wanted to ask a few questions that I hope
some of you may be able to help me out with.

First off, here are the specs for the battery:
Camera: Minolta DiIMAGE G500
Battery: Lithium Ion NP-500, 3.7V, 820 mAh

I think I found a good match for a solar cell and IC - the links are
below:

http://www.sparkfun.com/commerce/product_info.php?products_id=7840#

** The link was incomplete:

http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1037,P9551


** That charger IC is probably *quite unsuitable* for use with a small
solar panel - due to the total unpredictability of available voltage and
current.

Quote:

" I don't necessarily need the battery to fully charge in one shot, but
merely keep the battery from dying over the course of a week or so. "

Since you only require to perform top ups on the battery - simple, direct
connection is all you need. That solar panel will likely never deliver
more than 200 mA anyhow.

Rest of your tortured, over-analysing deleted.




...... Phil




.

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