I know this has been talked about before, I just do not remember where and when. From what I have seen, brands have their wattage based on 14.4 volts. I believe someone stated that a boat will never run at 14.4 volts, but rather closer to 12 volts, thus causing a lower wattage than expected. Was/is this true. If so, what brands have their wattage based on 12 volts?

Thanks