This post tells us that to avoid overcharging batteries we must try to keep the solar panels output current at max 10% of the batteries max current e.g. to charge 1700mA batteries we should use max. 170mA solar panels.
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The 10% rule
This post tells us that to avoid overcharging batteries we must try to keep the solar panels output current at max 10% of the batteries max current e.g. to charge 1700mA batteries we should use max. 170mA solar panels.