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Note that production on Deye PV port will be shaved to the rated power of Deye inverter (e.g. to 12kW for 12K inverter). So, PV+Gen port should be less than Deye rated power.

I would say yes to the 15 kW pump as a smart load regarding the Deye 12K specs with passthrough of 45A per phase from grid to load or gen port in on-grid mode. Momentarily, in off-grid mode, for pump startup Deye can withstand enough to get it started. Gen port can be used for stupid air...

Parallel batteries needs to be the same , connected with BMS 485 internally and one master needs to connect to the inverter. DC needs to be on busbars with a fuse at least for main, better for each battery separated.

I guess you tried all, even undocumented modes with no luck? In a similar situation with Teže parallel batteries using Pylon protocol with RS485 did not work and at I have asked Deye support to upgrade the inverter. After that CAN protocol (mode 00) started to work. I would say luckily. If you...

I believe there is no upper limit possible to be set to stop charge at 80%. If you enable Time of use (TOU) then it can stop at 80% for grid charge at the desired power only. It will still charge towards 100% if you have more solar than load. What you can do is to change charging power in TOU...

In a similar setup with Deye+Solaredge I was able to increase Deye max sell power to my 19200 W limit by sending Customized write command over deye loud.com interface by changing mod is register 143. The command sent is 0110008F0001024B008F9F where 4B00 is hexadecimal of 19200W and last two...