February 19, 20206 yr Hi. Thanks for this wonderful forum with a wealth of information. I have an Axpert VMIII 5KW with 2 X US3000 Pylontechs and 10 X 355W Canadian solar panels. I set the Max charging rate to 40A (2 X 20A per battery) as suggested by my supplier (and elsewhere) and after my solar panels were installed I changed the AC charging rate to 2A. However, the Max charging rate appears to be auto adjusting itself irrespective of whether I change it on the inverter or via Watchpower. I've seen the Charging current go as high as 53ish A at the 88% threshold late morning with the Max charging rate showing 70A even though I just changed it, then a little later with the battery at 100% the setting shows 20A or 10A even though I haven't changed it? Is this normal BMS behavior with the Battery type set to PYLON or is something weird going on here? Many thanks, Trevor.
February 19, 20206 yr 2 hours ago, TrevorD said: I set the Max charging rate to 40A (2 X 20A per battery) as suggested by my supplier (and elsewhere) ? The usual rule is 25 A per US2000, and 35 A per US3000. So 70 A max for 2 x US3000. Quote However, the Max charging rate appears to be auto adjusting itself ... Is this normal BMS behavior with the Battery type set to PYLON or is something weird going on here? Yes, I believe it's normal behaviour. The BMS is telling the inverter the maximum safe charge current at any point in time. It's watching the voltage of all the cells, so it's in the best position to know what is safe. If suddenly one cell can only take 24 A say, then the BMS will say so and the cell is protected without having to disconnect the load. That's the main advantage of the PYL battery type setting.
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