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I will confirm - I have had same problems as OP with power wall discharge during nonpeak and charging from grid during peak while using cost savings mode on 20.40.3. New system and figured there are still some “wires loose” with the system as a whole and tech planned to come out again...already has been out before for entire day trouble shooting stating some of my system was connected to a neighbors, some reverse grid direction from PV, need a new part for one of the inverters, etc.
Meanwhile, have been switching between backup and self powered mode manually which was “working” fine. Now today, powerwalls discharged below set reserve of self power mode (reserve 30, went down to 19 before switching back to grid) ..... go figure.
Shouldn't you be using Advanced Time based control if you are concerned about peak/part-peak/off-peak periods? If you only use Self-powered, it doesn't pay any attention to peak/part-peak/off-peak periods.Pics for above postView attachment 628833View attachment 628834
I just noticed your background has your solar roof. Mine has a solar panel because when I installed my PWs I had 3rd party solar. Now that I have a solar roof too I want my background changed.
OP (and I) were stating that advanced mode was not managing system appropriately for some reason when accounting for correct peak and no peak time periods.
I have been manually switching b/w self power ( during peak) and battery backup (during non peak) while waiting for more tech support to trouble shoot system. My point was that even then, there is a gremlin in the system when last night Powerwalls were discharging BELOW set reserve.