Because its an inductive clamp probe its truly Volt Amps, which is how watts are calculate. However because it doesn't really measure volts, you select it, there might be an opening for error. That being said, my reading is 90 VA per hour overnight. If each inverter uses .0625 amps at 240volts it will use 15 watts in standby. I'm not sure it it really is but thats my math. I will build a adapter for my killawatt meter to install between my pv and breaker panel when I get the chance and settle this. The panels more than mike up for this during the day, but 90 watts an hour all night can add up.
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