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marv21 avatar image
marv21 asked

ESS / Victron ignoring BMS Parameters Overcurrent / Not feeding in all

Hello,

as Iam new but did all the Trainingslessions, iam not 100% sure if i did everything correctly.

Iam currently just using one Battery (yes more to come, for 1:1 Rule and Offgrid situations).

The Battery is connected via CAN-BMS and the Parameters are shown correctly in the Console:

parameters.jpg


As you can see, CCL and DCL are around 90A.


But, if I start a big Load, ESS tries to discharge with over 190A, sending my Battery in Overcurrent Alarm (Battery BMS is shutting down).

overcurrent.jpg

The other way around, if there is a decent load (2000Watt), the Battery is only discharged with around 1000W (20A) - letting me pay for 1000W from the Grid...

Also the Battery is max Charge with 20A, even there is more PV Power (feeding into the Grid 4000W)


I dont know whats wrong, could someone check my setting please:systemsetup.jpgess.jpgdvcc1.jpgConsole-Pictures are taken in the Moment the SOC Limit was reached. But the Bug/missconfiguration that iam encountering is with Full Battery, 75% SOC and so on.

Multiplus-IIcerbo gxESS
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dvcc1.jpg (49.6 KiB)
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parameters.jpg (32.9 KiB)
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ess.jpg (62.1 KiB)
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1 Answer
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @Marv21,

Which battery are you trying to use? What does the Victron battery compatibility guide say about your current sizing?

The Victron system runs a load priority, what that means is that it will attempt to power the load that you demand first.

The discharge current limit is not a strict limit that is able to always and immediately be enforced by the system, once the immediate load is provided for, then it will attempt to balance out the demand to match those parameters, but this will happen after the load is provided, so it can result it overload situations.

The remedy is to increase the capacity of the system to provide for the loads that you're trying to run (or reduce the peak loads).

If that isn't possible, another remedy is to place the large loads on the AC-input side of the inverter - that way the grid provides those loads first, and then the Victron system will attempt to fill in for them over time, so the balancing delay is working in your favour (instead of against it).

The downside of that approach is those loads will not be able to run during a blackout, but it sounds like they wouldn't be able to run anyway given the system sizing.

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marv21 avatar image marv21 commented ·

Thanks for your answer.

Its not easy to rewiring the high loads to another Input.

Right in the Moment my sizing is way to small. I dont get why the Victrons starts with "giving all in" and then trys to reach die Overcurrent Setting and not start small and then ramps up slowly to reach the Overcurrent Setting... (In On-Grid ofc.)


But even with this, i dont get why the Battery isnt charging more then 20A (Grid Set 50W and Grid is -2000W)


And why it dont Balance my Importing to 50W (no Inverter is fully use - i know Victron dont support symmetrical ESS feed in)


vrm-nichtausgleichend.jpg


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