October 16, 20232 yr Hi, I have an installation (on one of my customers' sites) of 2 X Axpert 5NB (Mecer) inverters. They are connected to two strings (344Voc and 258Voc) and 6 X US3000 Pylontechs. From time to time (random) the inverters trip (milliseconds), and loses their settings. So, they would go from 230VAC to 220VAC, 50Hz to 60Hz, but most problematic, the battery settings go from USE to FLD and the voltage from 53.0V to 58.4V. The latter is obviously deadly to the battery BMSs, and we have fried two of them already. Mustek shrugs their shoulders, and also sent me 71.92 firmware "to try and address the issue". The inverters show no error codes, simply flashes and restarts immediately. Has anyone else found similar random trips on their systems? Edited October 16, 20232 yr by BigDee Solar
October 17, 20232 yr 20 hours ago, BigDee Solar said: The inverters show no error codes, simply flashes and restarts immediately. It sounds very vaguely like a power supply issue. Recapping might fix it for a modest cost, but finding someone who knows how to do that might be tricky. I wonder if there is a batch or two out there with lower-spec capacitors (and possibly other parts), due to COVID era shortages.
November 8, 20232 yr Author Thanks - one site was installed in March of 2021. The other one, with similar issues, is from June 2021.
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