Yes and no. The AUTOTHERM ERS system is powered from the vehicle battery. However, the pump takes about ¾ of an amp to pump 3 gallons a minute. Most of the power is used by the fan. This varies from vehicle to vehicle from a low of 2-3 amps at low speed to 5-6 amps … Continue reading If the system runs such a long time, won’t this run the battery down?