swenk

Hi all. So I have just added 2of pylontech us5000 to my stack of 3 us2000, connected to a parallel pair of axpert king 5k As per the instructions I have made the newest battery the master and linked the us2000 from it I'm getting error 61 when connecting the bms cable to the new battery. I originally made my own cable and I've just made a new one 3-8 5-7 to confirm. The old batteries were happily working for several years and still work when I revert to just them. Any suggestions? Many thanks

Is the slave showing SL somewhere? It's almost as if the slave isn't actually a slave. Hi Yes clearly showing SL. Agreed, that is the behavior I am seeing, although the fans always rev up in unison and loads are RELATIVELY evenly spread etc. Right at this moment is is really sunny, the batteries are full and it is showing fault 04 (low batteries) whereas the master with the bms cable attached is working just fine. Both of them agree that the battery voltage is 50.5V. I'll update the firmware and report back

Hi Thanks both for confirming. Yes I appreciate the diagram in the manual, it wasn't clear whether is was 'suggested' or mandatory. Thanks, I am now updating the firmware to see if I can improve the parallel functionality, to try to stop the 2nd inverter going into bypass when the batteries go below 50%. The master inverter is performing perfectly. I'll post back any additional info I learn.

Hi Coulomb Thanks for your reply. The issue I am facing is that the 2nd unit (not bms connected to the batteries) goes into bypass believing the batteries to be empty... Even though the pair are in parallel and set up accordingly. Hence my question about a 2nd battery stack... One per inverter, bms both individually bms connected. Many thanks Swen

Hi all Since this is a cross technology battery and inverter question I thought I'd place it in this section, hope that's right? So I have a parallel pair of 5KW Voltacon branded Axpert King inverters. Each have their own solar array, both feed a common stackof pylintech us2000 batteries and one has bms control of the stack. I have observed I can pull data between them in Watchpower, but that is as far as the 'parallel' function appears to go. The two inverter control panels are totally independent, I can set completely different settings on each and those settings are applied individually. Further the 2nd inverter doesn't realise it is bms connected to the batteries and must be put into 'user' battery mode so as not to go into fault. This causes the pair to not work very well together and to declare the batteries full/empty at differing times. Is this normal? Secondly, I have just bought some of the new voltacon branded 100Ah batteries, which they assure me are not compatible with the stack function of pylontech's own models (I believe this to be false information) despite being identical to the new pylontech 100Ah unit. Is there any reason, why I can't have two separate battery stacks for the two inverters (since the inverters appear to be so independent anyway), each with bms control from it's respective inverter? New voltacon batteries here https://voltaconsolar.com/lithium-battery-100ah-5120wh-48v.html Many thanks Swen

Hi, I just thought I'd update this for future ref. About a week after my post the inverter totally died one night. There was a strong burning smell and upon investigation I found that the plastic terminal box I had installed beneath the unit had melted. Turns out the issue was mine, during installation I had not terminated the battery DC cable properly, the arcing noise was the inverter not getting consistent current delivery. I am a professional engineer, so I am well aware of the dangers and slightly embarrassed by my mistake. As usual my home installation was done in a rush at night in bad light. Thanks for all the tips though

Hi all I installed a parallel pair of these inverters in May. One was virtually silent (apart from the fans), the other had always had a crackle/buzz/arc sound and when powered up it makes the lights flicker. Sadly I purchased the units 6months before I installed them, so they are now out of warranty (by 1 month) and the crunchy one has just failed. Very bad flickering, arcing sound and the smell of burnt transistors. Any idea where I can buy replacement boards? I am capable of testing and replacing the mosfets etc, but would quite like to have a spare on the shelf. Many thanks in advance