Re: Request comments on simple solar charger

Hi,

> days have sun, and you need 1.5W (ie, one day will charge enough for 3
> usages, on average.) If you use the cheapo 500mA panels you posted, that
> means you need 3V to supply this. Since a switcher isn't going to run

? The cells I was looking at are the 6000mA ones further down the page.

> SLA batteries like CCCV charging, which simply means that you don't want
> to dump a bunch of current into them initially. I've heard 1/10 C as a
> reasonable figure, so assume 700mA is the max charge they'll take.

These particular batteries are specified for 2100mA charge current.
When I'm testing them on my bench, I generally set my PSU for 1A
current-limit and set the open-circuit voltage to 13.7V, then let the
battery work it all out. When fully charged, the battery continues to
pull about 30-40mA depending on temperature.

Thanks for the advice. I'm going to do some experiments now and see how
it works out. (Luckily I have a large box of sacrificial batteries that
I picked up cheap!).

.

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