Interface / Life-Bit zum Nulleinspeise - Script mit automatischer Leistungsanpassung im Fehlerfall.

[SMGatAUXde]

Is your feature request related to a problem? Please describe.

Hallo,

I use the openDTU with the HoymilesZeroExport Scrip with battery.

So far it is not absolutly failproof. I am affraid that I have an problem whith the OpenDTU-Inverter connection, when pulling high power from the batteries.

Describe the solution you'd like

For this case it would be nice to hava the possibility that the openDTU sets the Inv. back to a predefined powerfactor. e.g. the base load. Maybe also dependent of the daytime if theire is power from the PV.

The OpenDTU and the system with the zeroExport control should verifie theire connection. kind of an life-bit.

Any suggestion how to realize that. Is there a way to implement that?

regards

SMGatAUXde

Describe alternatives you've considered

No response

Additional context

No response

[spcqike]

i'm not sure how but maybe have a look at https://github.com/helgeerbe/OpenDTU-OnBattery

[3DJupp]

Try to set a more restrictive power limit. Normally it shouldn't be an issue to ,donate‘ up to 600W (in 2024 800W) to the grid, if it's a small inverter (e.g. HM600/800)

I can't relate why we should overcomplicate things just for a few cents. Some people use water heaters or other appliances in order to increase the power consumption :D

My opinion is: Try to use as much as possible, but don't be afraid to add some regenerative energy to the grid. Optimizing the appliances to run whenever is a good way. Some were also using bigger inverters with some restrictive limits. Example: HM1200/1600 with 4*380Wp, limited to 600W. You will be limited to those smaller values, but you will be able to use more of the solar energy throughout the day

[stefan123t]

@SMGatAUXde please double check the Dynamic Power Limiter (DPL) function in the daughter project OpenDTU-OnBattery.

I have described a possible PM+DPL setup with a Shelly Pro3EM as Power Meter (PM) here in issue #272.

@3DJupp the example I have given sets the Export donation to -300W, i.e. half the allowed Export of -600 W (in 2024 -800W), as I agree that we should always strive to give something back to the community.

Actually I would love to setup a cooperative that we contribute our exports to and that invoices these exports as a virtual cooperative PV power plant. The proceedings from these donations can then be used to subsist our local maker spaces.