Solar Charging Lipo Battery

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Solar Charging Lipo Battery

Postby Hayeonggeol » Fri Oct 20, 2017 5:22 pm

Hi,

I had bought a 6V 3W solar panel and 7.2V 900maH lipo battery from Cytron.

I wish to design a solar charging circuit to charge this lipo battery with the 3W solar panel.

Any advice?
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Re: Solar Charging Lipo Battery

Postby sich » Thu Oct 26, 2017 11:25 am

It's not advisable to charge 7.4V 2-cell lipo battery with a 6V 3W solar panel. Solar panel ratings are stated based on the optimum condition. The output voltage is already less than 2-cell lipo battery, you have to boost it up and expect energy loss to the already very limited power converted from solar energy. Besides we should always balance-charge lipo cells too. So you will need to design or add a balancer to your circuit to protect/preserve the lipo battery. Charging 1-cell lipo is more straightforward in this case. Assuming your circuit is working perfectly, you also need to consider the time needed to fully charge your 900mAh lipo battery with a solar panel.
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