It depends on your amp really. If you have a chart that came with the amp, it should have 13.8v to wattage chart, and a 14.4v to wattage chart to give you an idea of what power your seeing at whatever voltage.
It depends on your amp really. If you have a chart that came with the amp, it should have 13.8v to wattage chart, and a 14.4v to wattage chart to give you an idea of what power your seeing at whatever voltage.