ata2k6

Aaaand the winner is @Coulomb The upgrade to 76.03 did the trick, the inverters are connected and works in parallel, no more voltage difference on the display. Thanks man, you saved the whole week, not just the day!

Well, I need to clarify this, sales person doesn't seems to be a technical person, hopefully they refer to to control board, not to the power electronics board, otherwise we did nothing... I'll need to disassembly one of the inverters probably to send a picture of the control board, otherwise they might send me something else and I will stay without inverters for some more time

I managed to discuss with the seller and they are sending me a spare main board, so I will have a backup. Unfortunately we don't know what version will have, only after installing it.

Oh, thanks a lot, that's a good starting point, I guess in FW the last two numbers are the actual FW version, the first two are versioning / batch number?

Hello, thanks for the suggestion, I'll try that first, once I receive the serial usb adapter cable, which hopefully works. Meanwhile I discussed with the seller and they are sending a new mainboard for test. My two inverters main CPU version in 07601 on the older inverter and 05606 on the new one in the app, on their display shows U176.01 respectively U156.06. The strange issue is that the old one reads about 0.1V more but not all the time, so I guess actually is less than 0.1V the difference but as it rounds the number up it jumps between the same value or 0.1 higher. Is such a voltage difference enought to throw F83 in parallel mode? The battery cables are the same cross section and lenght and they are connected both pairs in the same point.

Hello, I have a similar issue, want to connect in parallel two iGrid SV IV but they see different voltage for the same battery and firmware is different too... I was wondering maybe by upgrading the old one to the newer version might fix this issue, or at least I should try it