When the solar charger is not able to recharge the battery to its full capacity within one day, the result is often that the battery will continually cycle between a "partially charged" state and the "end of discharge" state. This mode of operation (no regular full recharge) will destroy a lead-acid battery within weeks or months.

The charger algorithm will monitor the state of charge of the battery and, if needed, day by day slightly increase the load disconnect level (i.e., disconnect the load earlier) until the harvested solar energy is sufficient to recharge the battery to nearly the full 100%.

From that point onward, the load disconnect level will be modulated so that a nearly 100% recharge is achieved about once every week.