Anyone ever figures this out? We have 2 x12kw 3 phase inverters in parallel with 5 sunsynk batteries and 9x 545w panels on each inverter with a 405v average on both. But some days we will get about 15 of the f55 errors. I have also notes when i swtich off the panels breakers and it restarts i still get the same error. Batteries are usually @50% and 53v