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Growatt SPF 5000TL HVM BMS does not support parallel connection of Pylontech batteries


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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.

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I hope you find a solution, but if you don’t, my advice would be: It sounds like you’ve invested heavily in batteries and panels as well. It might be worthwhile considering that the cheapest next step is to scrap that inverter and get a good one.

I had a Growatt inverter for maybe a day or two before I initiated a return. Not the installer nor technician of the supplier could get it working properly with the battery that they also supplied me. The technician tried to convince me that all my troubles will go away if I just installed panels and not just use it as a backup. I don’t even want to imagine the trouble I was going to have, had I gone ahead and installed panels on the Growatt. If they cannot implement a proper charging and discharging of lithium batteries, why would panels fix that problem?

I paid extra, got a Victron, and have been happy since. No worries. Everything just works. Yes, it does cost much more than a Growatt. But it doesn’t cost as much as 3xUS3000B batteries. And also works better, as it is a proper hybrid inverter. I’m extremely glad I came across this forum when I did...

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  • 2 weeks later...
On 2020/09/17 at 9:11 PM, csmit said:

Thanks, good advice!

spoke to growatt and they mentioned the inverter needs an upgrade and the battery system . im keen to know the results and would like you to follow through with speaking to the suppliers for both upgrades to be done so you have a working system ? Please post the result .

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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 a long running attempt to understand the relationship between my Pylontech BMS and the inverter settings. I have 2 x Pylontech US3000, the HVM inverter and 3.2 kW of panels. 

In the morning, particularly here in CT in winter, batteries get to to 22% DOD and from that point on, regardless of available panel charge, the BMS/Inverter will draw only 1650W until my lowest possible SOC of 60% is reached. At this point, suddenly the panels are then able to contribute to domestic load (see attached graphic). No attempt at changing settings is possible, beyond no. 12 being 22% and 13 being 60%. 

This particular event makes me circumspect about getting a third battery, as the charging time will become even longer should the DOD be reached. 

I am always able to get to full charge somewhere in the day (except on the darkest rainy day in the Cape) so this 'panel hijack' is deeply frustrating.

Thoughts much appreciated.

Richards_LI (3) (1).jpg

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  • 2 weeks later...

I have updated both the Pylontech and inverter firmware - nothing helps. There is a fundamental problem with RS485 comms between Growatt and Pylontech.  Both companies accuses the other of being uncooperative.  Growatt's strategy is to keep BS-ing users, telling them to try this and then that - like updating firmware to buy time, well knowing that there is a fundamental technical flaw.  Until the user is so exhausted that they just give up.  Worst technical support of any Chinese company. 

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And what makes just a little bit worse is that Manie from ICC software is not able support Growatt which would be a backdoor route to changing the inverter-BMS behaviour. Irritation value high, not sure if it warrants a new inverter or one of the more expensive versions. 

What is your way forward?

Mark

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2 hours ago, csmit said:

I have updated both the Pylontech and inverter firmware - nothing helps. There is a fundamental problem with RS485 comms between Growatt and Pylontech.  Both companies accuses the other of being uncooperative.  Growatt's strategy is to keep BS-ing users, telling them to try this and then that - like updating firmware to buy time, well knowing that there is a fundamental technical flaw.  Until the user is so exhausted that they just give up.  Worst technical support of any Chinese company. 

I was crossing my fingers that you get a solution that works. Planning to add more panels and few more batteries to my system in the near future but if this will be a waste, then i might have to look at getting two new inverters and selling my Growatt ones 

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On 2020/10/15 at 7:26 AM, csmit said:

I have updated both the Pylontech and inverter firmware - nothing helps. There is a fundamental problem with RS485 comms between Growatt and Pylontech.  Both companies accuses the other of being uncooperative.  Growatt's strategy is to keep BS-ing users, telling them to try this and then that - like updating firmware to buy time, well knowing that there is a fundamental technical flaw.  Until the user is so exhausted that they just give up.  Worst technical support of any Chinese company. 

Have manage to update the Inverter firmware from Mahone, and can now drop the SOC to allow the panels to be 'released' by the BMS at a lower SOC. However still max 32A and what's worse is that SOC is read as 100% all the time. Inevitably total shutdown yesterday when batteries were truly emptied as they were never charged. 

Mahone in China says I need to update the BMS as well. Could you advise on how to do this? Do I update via the inverter or by plugging in directly to the battery Master?

Thanks

WhatsApp Image 2020-10-16 at 6.48.26 AM (1).jpeg

WhatsApp Image 2020-10-16 at 6.48.26 AM.jpeg

WhatsApp Image 2020-10-17 at 6.58.05 AM.jpeg

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Wow, so there appears to be a big problem with Growatt HPM. I have 2 in parallel 5000TL HPM-WPV.

12x340w panels each, 8x3600kwh Dyness batteries. ( I’ve also been playing around with panel configuration for a totally off-grid installation at our rural guesthouse.)

In any case, everything was working great ( a few hiccups) until suddenly each inverter will not put out more than 17A charge current. This is a major problem since on overcast days I’m forced to reconnect to Eskom which is my goal to divorce due to their outrageous connection fees for rural installations.

I'm working with Growatt and Dyness but no resolutions yet.

I'm getting impatient and my initial favorable impression of Growatt and their inverter features is beginning to fade.

A few more details. While I was bench testing with different PV panel configurations the system worked fine. Charging current was fine (~>30A) and I was able to charge my battery bank in a few hours (full by noon).The problem arose after I expanded my batteries from 3x3600 to 8x3600 coupled with a weekend of overcast. My system went into SoC @20% shutdown and after that when the sun returned my max charging current would not go over 17A. To add insult to injury, at 82% SOC charge current drops to 14A and at 92% SoC it drops to 7A!! At this rate it takes three days to recharge my batteries. I may have to return my inverters and start over looking for a replacement.

if anyone knows more about this problem please speak up.

Edited by DavidRx
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Sorry Gents i have been hectic will revert when i can digest all of what is written here but long story short . Soc meaning Lithium battery mode is a mess . Go back to using USE setting and maintain a lowish float and a good bulk like 52v . 
This will allow balancing etc . But other then that i have had no joy from Growatt . I was developing the rs485 protocol for my own batteries and countless hours and effort to no avail their protocol sucks badly . Needless to say i will not touch another 5000TL HVM !

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