How to Limit Battery Charging Based on Total Grid Import and AC Load

Q&A and troubleshooting
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1

Hello,

Is there a way to configure the ESS so that it treats the grid setpoint as a maximum import limit?
The goal is to keep total grid import within this limit: when the AC load is low, the system can use the remaining capacity to charge the battery, and when the AC load is high, the battery charging should reduce or stop to avoid exceeding the grid import limit.

2

Have a look at this:

in particular, peak shaving which is the technical description of what you are trying to achieve.

3

Mike, Thanks for the tip.

Do you have some experience with this setting ?
I’m having some trouble configuring it.

I have a 3-phase net, but a single-phase battery inverter.
I have set the Multiphase regulation to “Total of all Phases”
The peak-shaving setting, is per phase. does this mean I need to take in account the singlephase from the inverter or the 3 phase from my net.

I would like to limit the total grid import to 6 kW,
Is this then 26A x 230V = 6K
or **9A ** x 3 x 230 V = 6K

Thanks
Frank

4

I use Node-Red for that.

5

Diederik,

Can you share the flow you are using for that ?

6

I guess there are several ways to achieve that but when all conditions are met I change the ESS state to “Keep Batteries Charged” and use “DVCC system max. charge current” to control it.

Setting this to zero will keep my SoC level and use the grid only for AC loads.

The whole flow is a more than that of course but this is just to give you an idea.