I have 2 of Powerwall 2 (I believe plus version) installed with an existing small solar array (3.3 kW). For the most part the Powerwalls were installed to have peace of mind if there was an outage. It seems that whatever settings are being completely ignored and if anything, the batteries are doing the opposite. I have it set to only use the upper 20% of the battery and the rest is set for reserve (should only use 80-100% range). I have it set to self-powered and not charging from the grid. My vehicle charging is set to only use battery to charge if it's above 80% but that should only matter during grid outage.
If the battery is at a higher state of charge say 90% and there is significant load from the house (say dryer going and wall connector going for a total of 17 kW) the system will work as normal pulling 10 kW from the battery and the rest from solar or grid. But after a few minutes it switches to do the reverse: the battery wants to charge from the grid at 11.5 kW even though the battery is above 80%. The expected behavior should be to use all the batteries can provide (10 kW) and grid/solar should provide any remaining kW until the batteries are depleted to the reserve percentage, then grid/solar should take over the load completely.
What is likely to be the issue?
If the battery is at a higher state of charge say 90% and there is significant load from the house (say dryer going and wall connector going for a total of 17 kW) the system will work as normal pulling 10 kW from the battery and the rest from solar or grid. But after a few minutes it switches to do the reverse: the battery wants to charge from the grid at 11.5 kW even though the battery is above 80%. The expected behavior should be to use all the batteries can provide (10 kW) and grid/solar should provide any remaining kW until the batteries are depleted to the reserve percentage, then grid/solar should take over the load completely.
What is likely to be the issue?
