Grid usage during force discharge

[eggy]

Hi,

I have a KH 10kW inverter. Using the mode scheduler, I have configured a force discharge rate of 3kW during a nighttime period so that there is some feed into the grid, but it is low enough that the battery isn’t entirely used up.

However, it seems that the system still uses the grid during this force discharge period if the house load goes over 3kW. For example, if the house load spikes up to 4kW it will use 3kW from the battery and 1kW from the grid which is not what I want because this costs extra on the electricity bill. What I really want is to export 3kW but increase the battery draw if the house load demands it.

How can I configure my system to behave this way?

Thanks.

[Will]

Sadly, you can't have your cake and eat it. The force discharge simply tells the inverter to output X kW.
This is then used to meet home loads first and any spare is exported. If you demand more house load than the force discharge setting, you will cause the grid to be used.

There isn't really a good solution aside from creating some complex automation logic to continuously monitor the grid usage and increase or decrease the discharge setting dynamically.

[eggy]

Thanks. I did some reading of some other forum posts, and it seems like there is actually a kind-of solution. If you set the export limit of the inverter to 3kW and then set the force discharge to the maximum (10kW), it will only export 3kW but still use the remaining inverter capacity on the house.

Haven’t tested it yet but will give it a go tomorrow. It would be nice if foxess could add a mode like this to the system, I can see it has been mentioned a number of times in different forum posts.

[MaterialBarracuda48]

Thanks. I did some reading of some other forum posts, and it seems like there is actually a kind-of solution. If you set the export limit of the inverter to 3kW and then set the force discharge to the maximum (10kW), it will only export 3kW but still use the remaining inverter capacity on the house.

Haven’t tested it yet but will give it a go tomorrow. It would be nice if foxess could add a mode like this to the system, I can see it has been mentioned a number of times in different forum posts.

That will work, just that you have to keep going back and forth to adjust it.

Say you have a 5kW export limit set by energy distrubuter, you have to set to 3kW overnight, and adjust in the morning to 5kW to allow the PV full limits, assuming you have PV of course.

[eggy]

I tried this tonight and it worked great!

[Wah]

I tried this tonight and it worked great!

Hi eggy

Do you mind telling me where did you set the export limit of the inverter? I am in a similar situation but can only see the 'Discharge Power' setting under Mode Scheduler. A screen shot would be even better!

Thanks in advance.

[MaterialBarracuda48]

Hi eggy

Do you mind telling me where did you set the export limit of the inverter? I am in a similar situation but can only see the 'Discharge Power' setting under Mode Scheduler. A screen shot would be even better!

Thanks in advance.

Check this post to see if the 'bug' is still active.
viewtopic.php?p=16433#p16433

[Wah]

Hi eggy

Do you mind telling me where did you set the export limit of the inverter? I am in a similar situation but can only see the 'Discharge Power' setting under Mode Scheduler. A screen shot would be even better!

Thanks in advance.

Check this post to see if the 'bug' is still active.
viewtopic.php?p=16433#p16433

Thanks for sharing.
Those setting are greyed out and not adjustable. I think it has been setup as installer configuration only. I am on H3-15.0-Smart inverter, firmware Master 1.39. An update to 1.44 is available but not sure it's worth risking as the system is working smoothly.

[MaterialBarracuda48]

Thanks for sharing.
Those setting are greyed out and not adjustable. I think it has been setup as installer configuration only. I am on H3-15.0-Smart inverter, firmware Master 1.39. An update to 1.44 is available but not sure it's worth risking as the system is working smoothly.

You can try also on the Inverter screen directly.


Check here to see if there have been any release notes https://fox-ess.tech/firmware-release-notes/

[eggy]

The only way I have been able to do this is by:

1. Physical interface (using the PIN)
2. Contact FoxESS to change it for you and tell them what you want
3. Modbus

Not via the app.

[Wah]

Thanks! Much appreciated.