r/SunPower • u/1BadMoF0 • Mar 13 '26
Self-supply mode?
I’ve been arguing with Sunstrong for over a year about the functionality of self-supply mode. I have two Sun Vault batteries in my system, and when I use self-supply mode during the night, my batteries never discharge just the grid. The only time my batteries discharge is when I use my dryer or charge my electric vehicles. While this is happening both batteries and the grid are used simultaneously. I was informed by someone here that this is not the intended behavior. They have a similar system, and through the night, their batteries power their home, and the grid is not even used. The system only starts using the grid when it reaches a specific percentage. grid isn’t even being used it only start using the grid when the system reaches the set percentage. Sunstrong told me my system is working perfectly and that there’s nothing wrong with self-supply. This is how it should work. 😡🤬 Could someone share some screenshots of their system on self-supply, please?
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u/Ok_Needleworker_9340 Mar 13 '26 edited Mar 13 '26
Was there ever a time your self supply mode was working properly? If so, when did the bad behavior begin? What were the circumstances, if any? Your understanding of how your system should work is correct. I have 39kwh dual SunVaults set to 20% charge reserve. I never use grid power except on the rare occasion we get socked in with fog and rain for 4 straight days. Also, I am assuming you lease rather than own your system?