SOC Recalibration Event

DIY
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1

I am “Gog” - Going off Grid and am monitoring my upgraded battery - Freedom Won 40/32 800Ah

My Solar Solution:

1 x Victron Energy Quattro 48/8000 (Grid Tied – Single Phase)

1 x Cerbo GX with ESS for Self-Consumption

1 x Victron Energy RS450/100 Solar Charge Controller / MPPT

1 x 48V Freedom Won 40/32 Lithium-Ion battery

1 x Yamaha EF6600 Generator with 2 x 16A Out lets - not in use at the moment.

8 x 345W Sunpower CPV Panels, S -25.88, Azimuth: North, Tilt Angle: 30°

The ESS Assistant will be removed when I disconnect from the grid. Right now I am running in inverter mode.

On Thursday 14/05/2026 06:15, the SOC was 76%. I then created several loads baking some Panini, running a pressure cooker, vacuum cleaner and induction stove. At 14/05/2026 17:48, the SOC was 68%.

15/05/2026 06:15 - SOC = 49% MPPT Active for the first time on this day.
15/05/2026 17:47 - SOC = 58% MPPT - Off

16/05/2026 06:17 which the MPPT State became active, the SOC was 39%.

By 12:54, the SOC was 51%. By 13:06, the SOC was 100%.

Below is an extract from the logs: 51 - 100% SOC from 12:54 to 13:06.

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Can anyone allude to what has happened here?

How often will this occur?

2

Where is the SOC coming from?
From the battery or a BMV/SmartShunt?
What device is selected as battery monitor in the settings of the GX device?

3

SOC comes from the battery BMS.

4

Its pretty typical for the way Freedom wons behave and they way they trigger 100%. It is something i have seen a few times. And the firmware version it is on.

If you go the vrm advanced, check the voltage ther eis a trigger leve and the way the current drops off - that is the trigger for the 100% jump. Kind of how a badly set up victron bmv or shunt works.
The ccl and cvl limit and voltage graph are useful.

5

Make sure it is configured in both system settings and DVCC.
If it is correct, open a support call with them.

They have had issues in the past with current meters and firmware.
They can easily adjust the BMS parameters if it is synchronising incorrectly.
I have not see it leap that much before, typically from the 90’s particularly if it has been charged slowly or not fully charged with any regularity.

Hopefully this is a lite 2 which has remote access built in.

6

Is this what you are looking for?

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7

I do not believe it is a Lite 2 as the only port avialable is the printer port which I can use for Orion JR 2.