January 28, 20215 yr Effectivement le problème semble être celui du BMS de l'onduleur. Suivons l'évolution ensemble
July 13, 20214 yr On 2020/09/17 at 4:53 AM, csmit said: I recently bought a Growatt SPF 5000TL HVM inverter and successfully connected it to 3 x Pylontech US3000 batteries through RS485 communication. Screen shows Li for Lithium battery. Everything seems to work OK except that MPPT charging current does to go higher than 32A no matter what I do: increasing the size of the solar array, discharging the battery bank to a low SOC, changing Program 14 (charger source priority), updating the firmware, etc. I then changed to 4 x Pylontech US2000s and same problem, but in this case the MPPT charging current does not go higher than 25A. Anyone else experiencing the same problem? Growatt advertises the maximum solar input for SPF 5000TL HVM as 4500W but with this limitation the maximum usable solar input is only 1600W (32x50) for US3000 and 1250W (25X50) for US2000. So, any PV more than 1600/1250W will essentially be wasted. I have the exact same issue. I'm talking to Growatt & they say the limit is from the batteries BMS . If you hook your system (just to test) in a standalone, your charge current will increase to 60A. (well mine did). Growatt's logic does not make any sense. Since they say that its too high for each inverter to charge at 60A when in parallel mode. I'm not sure why its safe in single/ standalone mode. Furthermore, they say if your load is not big enough then your PV will not provide more power... 🤔. I think I'm missing some dots... But I sincerely think & believe these are Growatt limitations & shortfalls... Just by the way we have upgraded all battery & inverter firmware which does sweet nothing...
July 13, 20214 yr You are absolutely right, I even changed inverters to the spf5000es version but it is the same problem in rs485 communication mode. In CAN communication mode, there is no load current problem but it is unstable (BMS error).
July 13, 20214 yr 49 minutes ago, Nishantr said: I have the exact same issue. I'm talking to Growatt & they say the limit is from the batteries BMS . If you hook your system (just to test) in a standalone, your charge current will increase to 60A. (well mine did). Growatt's logic does not make any sense. Since they say that its too high for each inverter to charge at 60A when in parallel mode. I'm not sure why its safe in single/ standalone mode. Furthermore, they say if your load is not big enough then your PV will not provide more power... 🤔. I think I'm missing some dots... But I sincerely think & believe these are Growatt limitations & shortfalls... Just by the way we have upgraded all battery & inverter firmware which does sweet nothing... Since your inverters can not export excess power produced to the grid, it will be limited to what the load demand is. For example, you have 10Kw of installed PV panels but your load is 700w and battery needs 1600w to charge. You will never generate more than 2300w because you will not be able to use the extra generated power. Where will the balance go? since you can not store it or use it. Only if you could export that balance to the grid, then it would make sense. Unfortunately the out put of SPF5000TL is not meant to be connected to the grid, therefore you can not export any power to the grid As for the 60A max current, you shouldn't worry about it if you have BMS connected. Your max current and voltage will be determined by your battery, I have seen this with my two inverters
November 1, 20214 yr Hi, I'm really battling to get the latest firmware for my growatt spf5000-es inverters and also not getting my setup correct for bms. I'm assuming it's because I don't have the rs485 can hub in place and trying to run off an old switch. Also battling to get my solar to charge beyond the 2540watt mark although I have a bank of solar that can output 5460watts but seems to limit on 18amps. Got two us3000 and two us30000c batteries hence I want to see if I can update my firmware. Not sure how yet but will figure it out once I got it via USB to pc. My email address is also [email protected] if anyone has personal experience with the growatt model and the battery types and some tips on getting bms working. Network cables might also be the factor as I tried many crimp styles as per forums.
November 1, 20214 yr Hi @Fred83 the 18 amps is unlikely to be the issue because with mine it's multipled by 300 volts. Please check your voltage when the amps are 18/max. Hopefully someone will have a fix for bms connections.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.