A fully charged type-27 lead-acid battery typically provides a maximum of 12.8-volts. Some people assume that is the operating voltage of an RV. But if you connect to the Shore Power Pedestal and let your AC/DC converter charge your battery, the line voltage will rise to 13.8-volts. If you have a solar system, the controller may raise the line voltage to 14.7-volts. Battery equalization runs typically increase the line voltage to 16.6-volts for two hours or more.
Most of the early designers sefab producing LEDs for the RV environment assumed a 12.8-volt environment, and their products failed at a remarkable rate in today's RVs and boats. Some learned that if they did not provide some kind of voltage regulation or power regulation on their LED circuits, product failure rates went out of sight.
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