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Question about Solar Lithium Ion/Polymer charger - v1.0
Moderators: adafruit_support_bill, adafruit

Re: Question about Solar Lithium Ion/Polymer charger - v1.0

by tablet on Sat Jan 19, 2013 6:37 am

Hello, thanks for reply. Then, How can I charge the battery?
Do I use a bigger solar panel, 12v 10W or 6V 10W?
If I use a 12V solar panel then I have to adjust the output voltage of solar panel to connect the charger.
Thanks,
Regards.
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Re: Question about Solar Lithium Ion/Polymer charger - v1.0

by adafruit_support_bill on Sat Jan 19, 2013 8:37 am

The battery will charge at the lower rate. Just slower.

You can use a larger panel. You can also connect multiple panels - but you should add blocking diodes to prevent reverse current through a shaded cell. Trying to regulate the voltage of a higher voltage cell would be inefficient.

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Re: Question about Solar Lithium Ion/Polymer charger - v1.0

by bridges_pdp on Tue Feb 05, 2013 10:28 pm

I've read the info about setting the charge current but I'm confused. The Prog1 has a SMD resistor already in place that sets the current at 500ma. Adding a 2.2k resistor will, according to the page, set the current to about 950ma. Can someone tell me what configuration would provide for the maximum safe charge current?

Thanks,

Scott

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Re: Question about Solar Lithium Ion/Polymer charger - v1.0

by adafruit_support_bill on Tue Feb 05, 2013 10:50 pm

2K in parallel with the existing 2K will give you 1k. Or you can remove the existing SMT resistor and solder in a 1k
Image

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