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Maybe this may have "killed" your battery on the long run, if you look at the manual you'll see that the setting US2 is more suitable for lithium-ion battery without coms and not USE, but then again I have no personal experience with how to correctly set this up . Anyway did you try to...

I noticed something odd in your video ... what is the little sign blinking to the right of the battery charge indicator ? .. you say it's lithium-ion battery what are the settings related to your battery (Li/US2 prog 5 ? / protocol prog 36 ?) (do you have any com cable intalled CAN or RS485) ...

Did you check the pannels connections ... I had a badly mounted MC4 connector (after instaling the cables I didn't "click" the metal part in the connector case) so while checking for continuity/voltage everything was OK but then when load applied it started going up and down like in your case. I...

First of all I see nobody answered this so I'll give it a try. You are talking about the 260 W Trina solar honey panels but you seem to be mixing some stuff. Your VOC calculations seem wright 10 panels x 38.2V Voc =382 V ... the 9 amps is the short circuit curent, your max current is 8.5A, SO...