Hi,
I am hoping someone has experience with this issue as I am new to Growatt.
SETUP
I have set up pre-prod system to augment my existing solar setup (Victron MP2 + Pylontech ESS + 6.5kW panels).
I have 12kW of 16s (51.6V) batteries attached to Growatt SPF5000ES with no grid input and no battery-inverter comms.
I have setup the following settings:
01: SBU (solar & battery priority)
02: 80a
03: APL
05: US2 (User settings 2)
12: 48v (back to grid)
13: 51v (back to battery)
14: 050 (solar only charge)
19: 55.6v (CV charge voltage) -- setting this higher did not help
20: 54.4v (float voltage)
21: 46v (low voltage cut off)
Firmare is 040-05-70 (CPU1) 041-05-701 (SPU2)
The aim is to be gridless and use solar to charge batteries and supply loads.
THE PROBLEM
There are circumstances that I do not understand where the batteries refuse to charge off the solar panels. I have read a lot of posts that relate to this but none lead me to an answer, so I hope that someone reads this and goes "aha ..."
I have drawn down the batteries using a clothes dryer drawing 1.8kW for about an hour ...
The panels have Voc of about 160v and MPP of about 120v and we can see that they are helping to supply the load. I had the load running for an hour or so and then removed the load.
No matter how long I stared at the screen, the solar charger refused to now recharge the batteries. Yes, I see that the CHG LED is on but the panels remain at Voc.
Just to ensure that the start voltage of 150v+/-10 was not the problem, I added another panel...
Again, the batteries refused to recharge.
In much of my testing, the solar WAS charging the batteries, but now it isn't.
I tried switching to from US2 -> USE but this did not help. I turned the batteries off and then back on and charging started. Power cycling the inverter also restarts charging.
I have seen comments that it could be a firmware issue or a faulty unit. Is there something else that I can try?
Note: I have used the unit with and without the communications between the battery and inverter - in both cases it WAS charging. I don't want to use it in mode 5 (LI).
Thank you for you attention.
Ron
I am hoping someone has experience with this issue as I am new to Growatt.
SETUP
I have set up pre-prod system to augment my existing solar setup (Victron MP2 + Pylontech ESS + 6.5kW panels).
I have 12kW of 16s (51.6V) batteries attached to Growatt SPF5000ES with no grid input and no battery-inverter comms.
I have setup the following settings:
01: SBU (solar & battery priority)
02: 80a
03: APL
05: US2 (User settings 2)
12: 48v (back to grid)
13: 51v (back to battery)
14: 050 (solar only charge)
19: 55.6v (CV charge voltage) -- setting this higher did not help
20: 54.4v (float voltage)
21: 46v (low voltage cut off)
Firmare is 040-05-70 (CPU1) 041-05-701 (SPU2)
The aim is to be gridless and use solar to charge batteries and supply loads.
THE PROBLEM
There are circumstances that I do not understand where the batteries refuse to charge off the solar panels. I have read a lot of posts that relate to this but none lead me to an answer, so I hope that someone reads this and goes "aha ..."
I have drawn down the batteries using a clothes dryer drawing 1.8kW for about an hour ...
The panels have Voc of about 160v and MPP of about 120v and we can see that they are helping to supply the load. I had the load running for an hour or so and then removed the load.
No matter how long I stared at the screen, the solar charger refused to now recharge the batteries. Yes, I see that the CHG LED is on but the panels remain at Voc.
Just to ensure that the start voltage of 150v+/-10 was not the problem, I added another panel...
Again, the batteries refused to recharge.
In much of my testing, the solar WAS charging the batteries, but now it isn't.
I tried switching to from US2 -> USE but this did not help. I turned the batteries off and then back on and charging started. Power cycling the inverter also restarts charging.
I have seen comments that it could be a firmware issue or a faulty unit. Is there something else that I can try?
Note: I have used the unit with and without the communications between the battery and inverter - in both cases it WAS charging. I don't want to use it in mode 5 (LI).
Thank you for you attention.
Ron