Loadpoint: use measured power for calculation if available #13427
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Instead of assuming the loadpoint is charging with
lp.effectiveCurrent
uselp.chargeMeter.CurrentPower()
to calculate the actual charging current. If no power measurement is available, fall back to the old method.This fixes #13322 where loads with long reaction times cause evcc to allow more current than available which results in oscillation.
Tested it on my installation without problems but may need some testing in other configurations.