Davy777

Hi @Jaxone So it turns out that the PMU/CMU was damaged by an overvoltage of 54.2V, even though my inverter charge voltage was set to 53.2V. Segen Solar ended up replacing the PM/CMU for around R2k and now it's working fine. Pylontech subsequently recommended that I set the charge voltage to 52.5V, which I have done. Another thing I found helped was to swap some of the battery packs around in the stack. A mixture of different internal impedances and high impedance battery lead connections could also affect the relative discharge rates of the packs. Hope that helps!

Thanks Coulomb, to be clear, the output source priority setting isn't changing at all. The other settings are changing after 5 or so minutes. Is the spikey output something that you've encountered before? Likely to be a firmware issue? Thanks for the tip on the firmware update. I'm assuming that updating it isn't too risky an adventure.. Could you perhaps point me to an article with instructions on how to go about the update itself? Cheers!

Really hoping that someone can assist me here because this is starting to drive me crazy! I have 2 x Axpert King 5Ks in parallel. Setting 28 shows PAL and when accessing them via either Solar Assistant or Watch Power I can see both inverters. So the comms and paralleling seem to be correctly configured. The main problem is that I'm getting hourly spikes caused by the inverters changing from one output mode (say SbU) to the other (SUb) for roughly ten minutes. I understand that this is the standard firmware time when switching to line mode. Interestingly, it's happening regularly at 2 minutes past the hour every hour: q I initially thought that this was being caused by Solar Assistant's Power Management function, but soon realised that it was also happening with SA disconnected and when I set the inverters manually. After some further testing, this is what I found: 1. When I manually adjust setting 01 on both Master and Slave inverters via the LCD screen, then it stays in the correct mode without these spikes. Both inverters operate normally in the defined mode. 2. When I adjust setting 01 on the Master inverter only (either via SA or manually) the corresponding setting 01 on the Slave inverter remains unchanged on its LCD screen. However, both inverters operate together in the same mode (i.e. either both in SbU or SUb) meaning that at any given time one of them is contradicting the LCD display. Additionally, they then seem to go into this intermittent output mode changing cycle for 10 minutes every hour. At times I also get both the battery and the grid LEDs illuminating at the same time on the inverter panel. 3. After reading further (https://forums.aeva.asn.au/viewtopic.php?p=75494#FAQ1) I thought it might be caused by my voltage settings (12, 13, 29) but even after adjusting setting 29 (44.9V) on both inverters to be more than 2V below 12 (47V) and more than 4V below 13 (50V) I'm still getting the same behaviour. 4. Changing other settings on the Master inverter only (i.e. setting 12 via either SA or manually via the LCD screen) it also changes on the Slave inverter, although it takes some time for the change to reflect on the LCD screen...around 5 or 10 minutes. Firmware version is 71.80

I'm having an issue where the setting 01 doesn't change from master to slave (or vice versa) on the LCD screen, however the operation does seem to show it changing. i.e. both set to SUb -> change master to SbU -> Master shows SbU on setting 01, Slave still shows SUb on setting 01 -> both inverters change to SbU operation for some time, and then seem to revert back to SUb. This is becoming a problem with my Solar Assistant as there really is no control over the output source priority and, consequently, the power management function doesn't work. Has anyone else encountered something similar to this, setting 01 not changing between master and slave inverters?

All batteries are operating in parallel, but I manged to get hold of Pylontech support and after a bit of back and forth, it seems that one of the current sensors on pack 2 is out of calibration. They suggested that I can reset it myself, but I need access to a variable DC charger: "If you still want to calibrate the current sensor, please use a DC charger, set 53.2V and 10A to charge the battery. Connect the battery in the batteryview, select 'option' then 'control panel', and check index 11 'current sensor reset'. When the current on the DC charger is displayed 10A, click the button and the problem should be fixed." I'm new to the Somerset West area. Could anyone assist me with a recommendation for where I could get hold of a DC charger (to buy or to use) as described above?

So the mystery deepens! I switched out packs 1 and 2. Same behaviour, pack 2 (previously pack 1) is still charging/discharging at around 20% of the other 2 packs. BUT...something else I didn't pick up before. The current pack 2 (the one operating at 20%) has a different serial number on its sticker than what is shown on the software. On the sticker, the serial number follows the same format as the other 2 packs (PPTAHXXXXX10) while on Solar Assistant it's still showing me the different format serial (PPTB2XXXX7).

Thanks P1000, They were procured at the same time. I'll double check the manufacturing date on the nameplate tomorrow, but I'm think that they are quite similar, so I'm not sure that it's date related. Will update tomorrow though

Thanks Nexuss, How do I go about this? Does is not void warranty, etc.?

Hi everyone, I inherited a system when I bought a house 4 months ago. 3 x Pylontech US3000A and 2 x Axpert 5kVAs. Originally the system had no controller, so the inverters were controlling the batteries on voltage only. I have recently bought Solar Assistant and can now see what's happening with the batteries. The master battery at the top of the stack is charging/discharging at around 10% to 20% the rate of the others. Eventually the whole stack is getting to 100% SOC, but when discharging, the master only gets down to ±70% while the other 2 are close to 21% and the system switches back to grid charging. From Solar Assistant I can see that the master battery has around 20% of the number of cycles that the other 2 have (±180 vs ±960). I can also see that it's serial number has a slightly different format, starting with PPTB2XXXX while the others are PPTAHXXXXX7 and PPTAHXXXXX8 respectively (i.e. sequentially directly after each other). Is there a chance that the batteries have different firmware which is causing the different charging rates? Any other thoughts or suggestions on how to remedy this? Many thanks!