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Old 09-01-14, 10:47 PM   #3
ICanHas
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That works nicely for loads that stay constant (when on) like most resistive loads, but not so well for heat pump type loads where the power draw can vary a lot with conditions.
It will work perfectly with heat pump. Read first, then post. I never advocated for kWh estimation of heat pump, but a duty cycle measurement in those applications.

It will accurately measure DUTY CYCLE in percent in any application
It is not susceptible to lock-up, surge glitch or reboot, or failure as common with the digital embedded system microcontroller design.

It will estimate kWh fairly well in constant load.

If you need a cumulative kWh, a decommissioned REVENUE GRADE kWh meter like this can be used, although the wiring complexity puts it out of casual DIY experiments as it presents additional safety concerns wiring up 240v through it.


Actually, the kWh used together with the AC clock will let you get average duty cycle as well as kWh.

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