Nimitz

Thank, but I do not have solar, only battery and inverter.

No, I do not have any limitations set on when to use or charge the battery.

I have also been looking for answers regarding the soc 100 -> 90 drop and have the following feedback to add. My setup: Deye 5kw, CFE 5100s, no pv's My installation is one week old, the first 4 days my soc dropped from 100 to 90, three cycles per day. See the charts that I collected from the Deye iCloud dashboard. The past 3 days the behavior has changed from 100 to 95 in short intervals. This was without any firmware updates. Im starting to think this is the normal maintenance behavior of the CFE bms. Everything else is working exactly as expected without any issues or errors. Also for the guys struggling with the Battery wifi, this vid helped alot.

Hi @selenium, so glad I found your post. Ive been looking at the 12V lithium options for quite a while, but I changed my mind. What battery did you go with and what was your experience? I stiil need to get a 24V inverter, i'm considering the MUST 3KW or the Synapse 3KW. The Must has great solar and battery charge specs for the price. Any advice will be appreciated. Great work on the spreadsheet, clear and easy to understand.