leifhain

Dear Coulomb, please apologize for not replying to your reply. Apparently I do not receive email when someone replies to me. You were right, there was something very wrong with my inverter. I connected the Pylontechs to two parallel MPPsolar inverters without communication cable (USE settings) and everything went fine. For a while. See previous post. Thanks for your diagnosis.

After two months of seemingly flawless operation (without communication cable between masterbattery and inverter, but with communication cable between batteries), one day, I saw that the master battery showed full soc permanently, as if it was idling. Other batteries still charging/discharging as normal. My supplier (WCCsolar, Sevilla, Spain) said the battery BMS probably is damaged because I had all pins on 0001 (upside down) in stead of all batteries on 0000 (??). I decided to take the master out and run the system on the two remaining batteries. When I switched them on, they both went into alarm status (without buzzer, just the red light) and I can not get them started anymore. It looks like my supplier is not eager to help me out or, on the contrary. In my case, the master never should have disconnected itself from the series while the remaining two still go on. The load is calculated on 3 batteries, not on 2. My opinion is that the Pylontech US3000C on-board BMS is not OK, at least in the series I bought. However carefully connected, apparenty there must have been no or at least bad communication between the batteries.

I bought 32 pc B-grade BYD 320AH cells from ROWEN in China, through Alibaba. They offer DDP price (includes transport, fees and customs). My set costed 2650USD all in. I received them three weeks ago well packed (8 boxes) and perfectly balanced (voltage and internal resistance). I installed them straight away in 16S (48V) with a JBD BMS and Xiaoxiang bluetooth monitoring app (admin version). They promised 260 to 270AH real capacity. It looks like they have at least 270AH. All cells seem to be in good health. I will keep you posted on further experiences. Hartelijke groeten uit Portugal.

Hi everyone, I have exactly the same problem with the exactly the same hardware. The Axpert Max does not 'see' the PV generator. Voltage on the PV INPUT terminals is 37V (inverter ON) while PV voltage after the breaker is +/- 400V. My supplier advises to run the inverter on program USE (not PYL) with the following parameters. 02 = 60A 05 = USE 11 = 60A 26 = 53.2V 27 = 53.2V 29 = 45V I presume the aim is to bypass the Pylontech BMS; inverter does not notice when I unplug the com cable. In the first place, it does not solve the problem. And secondly, I think Pylontech BMS takes better care over loading and charging than the Axpert. Please help. We are off-grid. Kind regards from Portugal.