Small Solar Maintenance Charger Advice Pretty Please [emoji120]
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A shunt regulator is another option in this type of application. It simply clamps the voltage at the set level thus preventing to going above that limit. It would be placed at the panel, before the blocking diode so should be set to about 13.9V (the ideal 12.9V plus the 0.6V drop across the diode). Probably not readily available to buy off the shelf, but anyone into electronics could knock one up for the cost of a beer or two.
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