Consumption Accuracy - apply offset?

wills106 / homeassistant-solax-modbus

SolaX Power Modbus custom_component for Home Assistant (Supports some Ginlong Solis, Growatt, Sofar Solar, TIGO TSI & Qcells Q.Volt Hyb)

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Consumption Accuracy - apply offset? #483

Open solarjones opened 1 year ago

solarjones commented 1 year ago

Not a bug but an observation.

I've been comparing the kWh import & export totals (Grid Import Today & Grid Export Today) read in from the inverter (Solis) against those from the utility provider (Octopus) smart meter data. There's a consistent under read in HA, almost accurate but not quite and I obviously know the Solis inverter isn't as accurate as the smart meter itself.

I'm wondering if there's a way of applying a multiplier (~1.05 in my instance), to raise the values being read in from the inverter into HA at a plugin level? Or am I missing something obvious? Thanks!

alienatedsec commented 1 year ago

@solarjones mine is the same as the inverter and the CT clamp may not be accurate enough. I am missing about 0.25 kWh usage a day which contributes to about 7.50 kWh import not registered by the inverter per month.

solarjones commented 1 year ago

Oddly the myenergi Harvi CT clamp is very accurate and positioned directly next to the Solis CT on the same wire. While the 'inaccurate' Solis readings aren't a big issue, it's a shame there isn't an offset applicable somewhere to tune it.

alienatedsec commented 1 year ago

Again, similar with my Zappi Grid CT clamp is much more accurate and shows those daily import closer to my Octopus one. Solis is more likely to show 0.0 import.