The Tank › water heater lockouts caused by power failures???? › Reply To: water heater lockouts caused by power failures????
Hello: About power usage; the Kill-a-Watt would accumulate a day’s usage, which you would multiply by the number of days (or partial days) power might be out. That would give you battery size. Load the device can handle (in watts) should be part of its specification. The Kill-a-Watt also can measure present use, so you know peak wattage. Tools are good 😎