I just want to know if I am the only one with this “issue” Since a few weeks I noticed that the target SOC is already reached approx. 15 minutes before the full hour. It happens when charging and discharging the battery and every hour… I can’t remember if this was always the case. For example DES…

Same here. I’m not shore if it should help to change settings in DESS max discharge and charge. Dess used that values for calculating, but I had no luck so far.

@Maxs Thanks for your feedback I also tried to change some ESS/DESS parameters but for now no luck… I maintain two DESS systems and both have this behavior since let’s say a month

I have the same happening. Doesn’t seem to prioritise the battery usage once the Target SOC is met with the consequences of higher grid costs.

Few things: If SoC is being reached before the end of the hour then it is possible your actual battery size is smaller than configured battery size or there is an issue with the reported SoC from battery or shunt. You could try configuring slightly smaller battery capacity in DESS to mitigate thi…

@dfeist Thanks for your suggestions. Target SOC is also reached to soon when charging. It is always approx 10 minutes before the hour and I noticed that also that the DESS schedule0 is updated approx 5~10 minutes after the full hour… so sometimes “nothing happens” (DESS system is idle) for more th…

I made that observation too but while charging, i.e. target SoC being reached 5…10min earlier than planned. And one possible explanation is the the calculation of the charging power vs. system losses (which depend on the charging power) vs. SoC calculation errors (which are natural because of the f…

FYI. You can see what the calculated charge rate is by looking at the dbus path com.victronenergy.system/DynamicEss/ChargeRate using dbus-spy if you ssh in (or via modbus tcp register 5403). You can see the calculation used here: dbus-systemcalc-py/delegates/dynamicess.py at master · victronenergy/d…

Huh what is this 1.1 factor… [image]

To account for efficiency I beleive. It should really use paramatized value for this though.

DESS: Target SOC reached to soon

Q&A and troubleshooting DESS

cotje 3 March 2025 16:58 11

Same here: DESS: strange behavior 10 minutes before the hour

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DESS: Target SOC reached to soon

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