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A rule of thumb is to divide the total battery capacity by the total energy consumption of running appliances. This will be applicable to the calculation of all types of appliances. With one or two aPower batteries, a homeowner with an average consumption pattern can expect to run their appliances for 12 hours using battery power during the night. The FranklinWH system also includes a Smart Circuit Module, where it allows the homeowner to pre-set operating schedules for large appliances. This will help them extend the battery backup and run their large appliances more efficiently.