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Just before I email tesla, this is how my PW has been working quite happy in the UK on go.
My power wall has always starting charging at offpeak time and once charge goes to standby until peak time when it’s starts discharging.
Due to updated export amounts
Offpeak
7.5p kw im 15pkw ex
Peak...
FYI, with update to 22.36.6 a few weeks ago (12/03/23) noticed a change to grid charging.
Jumped from 3.68kw (ish)per pw to 5kw per powerwall. Will see if .9 is the same. (PW2 dec22 build)