hi every body !
On my ESS setup with a Multiplus1 5000 and 5Kw pylontech battery.
In the morning, after reaching my low SOC limit overnight, the solar panels recharge my batteries.
From what re-achieved SOC percentage or what available PV power is the grid no longer utilized ?
Can I have control on this parameter and how ?
Thanks very much
Dominique
If you want to use all you have set optimized without battery life and min SOC to 0%. These settings ensure you use all the battery.
Ok thank you for answer
but ti’s was not my question.
i have a answer:
There is no single fixed value, because this threshold is configurable in the hybrid inverter/charge controller of your system.
The point where the grid is no longer used depends on two interdependent factors:
The grid stops being used when the battery reaches a minimum safety SOC percentage that has been configured.
System logic:
Most hybrid systems are programmed to avoid drawing from the grid as long as the sun can recharge the batteries for free.
Typical behavior:
After reaching the low limit (e.g. 20% or 10%) during the night, the system will often wait for the solar charge to raise the SOC above a small buffer, for example:
This percentage is the point where the system considers it has enough “safety margin” to run again using only solar (PV) or the battery.
The grid is no longer used when the instantaneous solar production becomes sufficient to cover the entire house load (the consumption).
System logic:
At sunrise, PV production is low. If the house load is higher than the PV production, the deficit is taken from the grid (because the battery is still at its low SOC and in “priority charging” mode).
As the sun rises, PV production increases.
The grid stops being used when:
PPV≥PLoad+PBattery_Recharge (!!! the P Battery recharge is not a fix value and depend of the Pw Pv just now and the Gluttony of the batteries)
(PV power is equal to or greater than the power consumed by the house plus the power used to recharge the battery.)
In practice:
It is often reaching the reconfigured SOC threshold that marks the end of the grid-dependency period in the morning, provided the PV power is sufficient to at least maintain the load.
You need to check the settings of your hybrid inverter or your BMS (Battery Management System), often under entries such as:
“Minimum SOC for Discharge” – the minimum SOC allowed for discharging.
“Grid Charge Enable SOC” – this is the low limit you reach at night, where grid charging is enabled.
“SOC Restart Threshold” – this is the point you are looking for. (ok ! but where is this parameter !)
