Growatt SPF6000 es+ & Dyness BX51100 not charging after drained below 20%

[jestermaroc]

We have two installations where a Growatt/Dyness system gets drained to below 20% and the system does not automatically start charging the battery the next morning even though there is good solar power available. The systems are as follows:

System #1
Growatt SPF5000es
Dyness A41100
8x Jinko Solar 580w panels

System #2
Growatt SPF6000es+
Dyness BX51100
10x Canadian Solar 550w

On both systems we have run into the issue, and a full system reset (ie switching off the solar, inverter, then battery) is needed for the inverter to charge the battery.

Both systems are on SUb priority and Li 52-36 program which has full communication to the Dyness BMS. System #1 exhibited this behaviour even though utility and solar was available. System #2 is was installed last week and had the same issue this morning although only solar was available..

Any suggestions welcome.

 

[AshleyL]

Because Dyness BMS will perform a hard disconnection at SOC of 20% and will not accept any charge/discharge unless if you do a BMS reset.

Solution, ensure the "Back to grid" at 25% to be safe and double ensure you have grid or generator?

Note: you can actually find the shut off SOC% at the Dyness manual/user guide, you know.....

 

[jestermaroc]

Because Dyness BMS will perform a hard disconnection at SOC of 20% and will not accept any charge/discharge unless if you do a BMS reset.

Solution, ensure the "Back to grid" at 25% to be safe and double ensure you have grid or generator?

Note: you can actually find the shut off SOC% at the Dyness manual/user guide, you know.....

Thanks. However, this solution is likely to only work if there is grid available. It seems there isn't a setting on Growatt to cut-off at 25% in order to retain charge in the battery to allow automatic recharge once solar or grid returns. Grid power is only available for a few hours per day at most, some days there is no grid power available for extended periods.

 

[AshleyL]

Thanks. However, this solution is likely to only work if there is grid available. It seems there isn't a setting on Growatt to cut-off at 25% in order to retain charge in the battery to allow automatic recharge once solar or grid returns. Grid power is only available for a few hours per day at most, some days there is no grid power available for extended periods.

There is a setting in Growatt to disconnect the load which is Prog 21. Remember, there is a spread of 5% between Prog 12, 13 and 21.

If you set Prog 21 Low DC cut-off SOC to 25%, then automatically Prog 12 back to utility will be 30% and Prog 13 back to battery will be 35%.

However, you do realize the inverter get its "operating power" from the battery. The inverter needs power .......to produce power. Even if you disable the ac output/load at 25%, the inverter will still consume 50 - 60watts from the battery until it is depleted.

 

[jestermaroc]

There is a setting in Growatt to disconnect the load which is Prog 21. Remember, there is a spread of 5% between Prog 12, 13 and 21.

If you set Prog 21 Low DC cut-off SOC to 25%, then automatically Prog 12 back to utility will be 30% and Prog 13 back to battery will be 35%.

However, you do realize the inverter get its "operating power" from the battery. The inverter needs power .......to produce power. Even if you disable the ac output/load at 25%, the inverter will still consume 50 - 60watts from the battery until it is depleted.

Thank you. I was unaware this could be set to % rather than voltage. Will have a look tomorrow.

 

[AshleyL]

Thank you. I was unaware this could be set to % rather than voltage. Will have a look tomorrow.

Voltage? You sure the BMS - Inverter comm is working? In BMS - Inverter comm mode, those Prog 12,13 and 21 will be shown in percentage instead of voltage.

Those are Growatt inverter settings, not Dyness BMS setting.............that 20% shut off SOC is hardcoded into Dyness BMS which you have no control over.

 

[jestermaroc]

Voltage? You sure the BMS - Inverter comm is working? In BMS - Inverter comm mode, those Prog 12,13 and 21 will be shown in percentage instead of voltage.

Those are Growatt inverter settings, not Dyness BMS setting.............that 20% shut off SOC is hardcoded into Dyness BMS which you have no control over.

Yes, its working fine. I didn't touch Prog 12, 13, 21 as I wasn't aware one could adjust these when the BMS comms is working.

 

[Denis_Tsarev]

Hello. I have such a problem. Growatt SPF 6000 ES plus inverter and 4 HOPE 4.8 kWhr batteries are installed, there is no network, but there is a 5 kW generator. The batteries are very discharged and the inverter writes error 19. I can't charge them, neither from the generator nor from the solar panels.