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Thanks akatopaz, I'm afraid the I'm no good at the deep software stuff..hardware and updating firmware I'm fine. It's the code is a dark art to me. I contacted solax and their response is buy our batteries. As fox 123 says it looks like they are writing out third party batteries. Im running ARM...

So looks like its old firmware update time..

Hi Fox123, did you find any solution to the bat volt fault ie07. I have a solax x1 hybrid g4, hooked up a pylontech H2 ( 96 v) battery and it works no issue but when I stack a second battery I get the IE 07 fault. But each battery works fine. It like solax have limited upper voltage for lithium...

Ah cheers...solax x1 hybrid g4 5kwh. Pylontech H2 fc0500-40s ( control module) 2x 3.5kwh batteries.....everything works well on one battery.3.5kwh 96 volts, but you can stack batteries on the H2 so with two batteries I'm 7.1kwh and 199v. As soon as second battery installed , I get the error...

Cheers for the help akatopaz. But I will probably just change the inverter to accommodate the expanding pylontech H2 system. Down grade the solax to grid tie system running a few panels ( looks like another project). Solax was a good system until they cut themselves off from not allowing third...