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sgs

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  1. Thank you for the help - much appreciated! I tried lowering setting 29 last night by 0.5 volts, and sure thing, the inverter kicked to grid at 49v this time, not at 49.5 as before. So now will monitor SOC more closely and slowly lower the safe discharge voltage until a reasonable DOD is achieved.
  2. My apologies if this has been asked before, but I have trawled through this forum and read a lot about the Axpert and Pylontech combo, and haven't been able to find a difinitive answer. I'm hoping that someone can maybe throw some light on this funny problem? I have a Mecer SOL-I-AX-5M (Axpert 5kva/4kw) - as it came out of the box a few years ago - no firmware mods/hacks etc. The system has been running for years using a bank of lead-acid batteries, but the bank has deteriorated to the point where it needed replacement. So it was "upgraded" to a Pylontech UP5000 battery. Since there are warranty concerns when connecting these batteries to Axpert inverters, the installation parameters supplied by Pylontech were followed to the letter. However, the system isn't behaving as I expect it to behave, and barely uses any battery before failing over to the grid after sunset. The settings are as follows: Program 01 = SbU Program 02 = 50A Program 05 = USE Program 12 = 48V Program 13 = 51V Program 26 = 53.2V Program 27 = 53.2V (not specified by Pylontech) Program 29 = 47.5V The behaviour is that the battery charges nicely during the day, and then starts feeding power back at night. I expect that it should drain until the voltage drops under 48V, but it only runs down to 49.5V. The moment it drops to 49.4V, it falls back to grid, only to go back to solar the next day again. (The battery SOC leds still show between 4 and 5 lit at this stage, so there is still plenty of juice available, and I doubt if there was a chance that it could have dipped down to 48V because the power draw on the system is very linear.) I've read a thread here that suggested setting Program 29 to always be 2V lower than program 12, but I haven't seen this mentioned anywhere else - and also does not compute with the settings supplied by Pylontech. Could this be the reason for this? (And if so, is this a "bug" in older Axperts maybe fixed in newer models?) The plan is to get ICC or Solar Assistant installed to monitor and control the inverter according to battery SOC, but if the basics aren't working, then I'm not sure that any of those will just magically "make this work". Any suggestions would be very much appreciated! Thank you!
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