The ONT has a back up battery that is 12V at 7.2Ah. Any UPS you use should have at least that capacity. No need to calculate the draw from the ONT, Engineers already did that and put in the proper back-up battery for that unit.
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The ONT has a back up battery that is 12V at 7.2Ah. Any UPS you use should have at least that capacity. No need to calculate the draw from the ONT, Engineers already did that and put in the proper back-up battery for that unit.