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Recharging (rechargeable) lithium-ion batteries is — unfortunately — not a straight-forward process. Unless you cap current you will damage severely-discharged batteries during the initial charging phase. They react very poorly to being overcharged. Even small amounts of undervolting will translate to large amounts of capacity loss. Added to that, there ...


Energy losses in a cable — due to resistance — are proportional to the current squared (I²). Thus if you double the current (by putting your panels in parallel) then you'll quadruple your losses ( (2I)² = 4I² ). When panels are connected in series, the voltages add up but the current remains constant. Thus to minimise line losses, connect panels in series....

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