September 6, 20197 yr 8 hours ago, ProDave said: It is generally recognised that using burst firing of an immersion heater, you need to keep the flow of energy back and forth to under 1Wh so it does not get metered. I suspect just counting 1Wh pulses would be too coarse for that to work. Yes it would be, as the meter anti-creep threshold is usually about 1 Wh, so if you want to bounce energy back and forth when running water heating from excess PV generation then you need to meter to a fair bit finer resolution than 1 Wh.
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