Have Battery set to "Stop discharge set to 10%" and "Battery Start Discharge set to 50%".
When the battery gets to 10% Discharge it stiops and transfers to the Grid, when the PV starts generating a bit
it starts charging the battery and when it gets to 11% it turns Grid off and takes current from Battery.
As the PV increases this change between Grid and Battery goes on quite quickly.
I assume this is switching relays in the inverter and cannot do it any good.
Why does the inverter not wait until the 50% setting is reached?
How to stop it.

David

System:-
36 x JA 540w panels
9 on each MPPT on each inverter
5 x PylonTech 4.8Kw Batteries

2 x 8K SG01LP1-EU COMM:e424-MCU:5374

what are your time of use settings? please share a pic of your System Mode > Work Mode 1 and 2 screens as well as your battery shutdown screen

3 hours ago, mzezman said:

what are your time of use settings? please share a pic of your System Mode > Work Mode 1 and 2 screens as well as your battery shutdown screen

 

3 hours ago, mzezman said:

what are your time of use settings? please share a pic of your System Mode > Work Mode 1 and 2 screens as well as your battery shutdown screen

 

Change low batt to 15% and restart to 20% to give you a bit more buffer at shutdown

Your Time of use settings will always drain your battery to 10% before moving back to grid... at all time slots. Time of use values are used first then the shutdown values are used in terms of the logic. 

What is the point of a Restart setting 50% if it does not use it.

It seems strange to use a timer system when nothing is time dependant, it should be on amount of pv generation above load and Battery SOC.

 

1 hour ago, David-OLW said:

What is the point of a Restart setting 50% if it does not use it.

It seems strange to use a timer system when nothing is time dependant, it should be on amount of pv generation above load and Battery SOC.

 

@mzezman

Seems to have provided a good value at back to battery of 20% and to use a low battery of 15% and only shut down the inverter at 10%. This gives time to reduce load before the shut down takes place.

@David-OLW
I would use a higher value on System Mode 1 SOC/V than Shutdown, something like this:

This means the switch to grid happens at 20% SoC
You have 13% (20-7%) reserve for load shedding.
In my case that's about 3+ hours as our load shedding is ~2h long.

The above values is what I use.

EDIT: Not sure if "Low Batt" sounds an alarm or stops using battery for load.
The documentation says: "Inverter low battery warning" whereas Solar-Assistant says: "Stop battery discharge"

 

Edited November 13, 20223 yr by system32

1 minute ago, system32 said:

@David-OLW
I would use a higher value on System Mode 1 SOC/V than Shutdown, something like this:

This means the switch to grid happens at 20% SoC
You have 15% (20-5%) reserve for load shedding.
In my case that's about 3+ hours as our load shedding is ~2h long.

The above values is what I use.

This is good because OPs shutdown and switch to grid settings were the same which mightve caused a logic issue on the inverter... do i shutdown or do i switch to grid.  And since grid charge isn't ticked it would've exacerbated this. Try the new settings and see if it performs slightly better

29 minutes ago, mzezman said:

This is good because OPs shutdown and switch to grid settings were the same which mightve caused a logic issue on the inverter... do i shutdown or do i switch to grid.  And since grid charge isn't ticked it would've exacerbated this. Try the new settings and see if it performs slightly better

Thanks.
Also enable grid charge:

This will cause the inverter to charge the battery from grid after load shedding if the SoC dropped below 20%.

Also:

Edited November 13, 20223 yr by system32