Shut-down multiplus based on SOC ?

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lucas asked Jan 14, '20

Shut-down multiplus based on SOC ?

Hello everyone,

I am currently running a system with the ESS assistant, and the start/stop generator.

I want the following :

1) When SOC >70% : Ignore grid input and use the PV/battey.

2) When grid failure : Use PV/battery until SOC drops down to 50%

The first point is working that to the Start/stop generator assistant.

However, in case of grid failure, I would like to run the batteries until a SOC of 50% before shutting down the system. How can I configure that in the Venus GX or in the VEConfigure.

I've only find a way to shut-down based on voltage...

Thanks you very much for your answer !

I have a system composed of the following elements :

- 1x multiplus 2000/48V
- 1x Venus GX

- 12 batteries ultracell 12V/200Ah

- 2x MPPT 150V/60A

- Communication cables Venus - MPPTs, and venus - Multplus

SOC

2 |3000

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Modifications Space

Node Red Space

Answer 1 · 2020-01-14T16:58:01Z

Riaan Barkhuizen answered · Jan 14, 2020 at 04:58 PM

Hi @lucas

You can configure the relay output on the color control or venus to provide a control signal to your generator.

First you need to setup this function under the relay menu

Once you have selected the function you can now configure the required logic. Below is the menu.

The SoC conditions are located as follows.

Generator start/stop settings -> Settings -> Conditions->Battery SoC

Let me know if this is what you are looking for.

Best Regards

Riaan

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2 |3000

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lucas commented · Jan 15, 2020 at 07:10 AM

Hi @Riaan Barkhuizen,

Thank you for you answer, however it does not solve my problem. Maybe I was not clear enough ;)

I have only PV, Battery and the grid connected to the multiplus (no generator).
I use the generator assistant in order to ignore the grid input for a SOC from 100% to 70%.

Now when the grid fails, I would like the battery to discharge to 50% but not less !

Is there a possibility to configure that, so that the whole system shutdown when battery are at 50% SOC and maybe start again when they are at 70% SOC.

thank you in advance !

Lucas

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stratanet lucas commented · Jul 21, 2020 at 04:52 AM

Hi Lucas,

Have a look at my post here: https://community.victronenergy.com/questions/13680/using-multiplus-soc-low-shutdown-with-bmv-soc-valu.html

It sounds like you're trying to achieve the same thing I am.

Cheers!

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ejrossouw lucas commented · Jul 21, 2020 at 06:21 AM

If you set the min SOC (unless grid fails) in the ESS settings it should work. My system is configured as optimized with battery life and if enough PV is available the battery will charge and the house coumes the battery. If the SOC drops below the set value it turns off the inverter and the mains supply the house. My timer is also set to then charge the battery off peak.

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