October 2, 20214 yr You guys are getting me very worried, that is my model I purchased in 2019, managed to find the axact model in the week, will I also have issues with firmware, I am running the PI with SMH, running the Pykontech BMS.
March 12, 20233 yr Hi, i have two inverters and when i have put paralells in it comes up error 71.... how can i update CPU version.... one CPU is 74.10 and other CPU is 72.10, what would be best ?? Thanks in advance
March 13, 20233 yr 19 hours ago, Samantha said: Hi, i have two inverters and when i have put paralells in it comes up error 71.... how can i update CPU version.... one CPU is 74.10 and other CPU is 72.10, what would be best ?? Thanks in advance It looks like you have inverters of different types. Basically you can only parallel inverters of exactly same type and with same firmware.
March 13, 20233 yr Yes, you have a 64 V model (72.10) and a 58.4 V model (74.10). Those have different transformer turns ratios, requiring different firmwares, so you'll never be able to parallel them. Sorry. Your choices are to exchange one of them for the other type (but it's sometimes hard to find out vital information like this before you buy), or you can split your loads and simply don't parallel them at all. This is not ideal, but with the supply constraints at present, it might be all you can do for a while.
March 13, 20233 yr 1 hour ago, Coulomb said: find out vital information like this before you buy), or you can split your loads and simply don't parallel them at all This of course is viable if we can share a common battery bus with the two disparate inverters. Will this work if we have both inverter chargers on same voltage profile?
March 14, 20233 yr 10 hours ago, BritishRacingGreen said: Will this work if we have both inverter chargers on same voltage profile? Yes, I can't see why not. It would be like having a separate MPPT direct to the battery. It might be prudent to have one (with the best solar, if there is such) have the battery charging voltages slightly (usually 0.1 V) higher than the other, so that they don't interfere with each other when trying to finish a charge. But at other times, they would pretty much worth together.
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