Hi, sorry for necroposting but I have exactly the same issue and I don't know why.
I have an Infinisolar V II wp 5kw inverter, since I mounted the battery I got this issue. I have a uhome lfp 5000. bulk and float voltage set to 55.2V.
Every time batteries are at 100% (at the float voltage i guess) the inverter raises a "08 Fault(Inverter Bus Voltage too high)"and immediately disconnects the load.
Could someone give me the last firmware for my Inverter? I tried ti contact Voltronic but they did not answer me, i May also try to mod It buy I Guess i Need the last One as a starting point. Thanks you so much