Device inverter instead of pvinverter possible?

[TheGrumpyBadger]

My HM-350 is connected to a LFP battery, which is charged by a Victron MPPT.
Is it possible to show the HM-350 as an inverter, as it is using DC power instead of PV ?

[henne49]

as long as you have a DTU like ahoy or opendtu, that we can read data from, it can be displayed in venus OS

[ude6]

Hi,
I agree. I am currently using your code to display the inverter (connected to the battery) as
a PV-Inverter. It runs very well. BUT it assumes the energy comes from PV where in reality it comes from the battery.

So when the inverter runs I see for example:

Battery (via dbus-serialbattery) -600w
PV-Inverter ( via your dbus-opendtu) +600w
DC-Power (calculated by victron) +600w

The problem is that the cerbo is not netting the DC-Power (which is the input to the inverter)
with the PV-Inverter.

So the question is: Can the Opendtu (or Ahoy) be used as an inverter that is powered by DC load?

Thanks

Andreas

[henne49]

We create a PV inverter in DBUS https://github.com/victronenergy/venus/wiki/dbus#pv-inverters

I guess you would need another service to make that correct

[ude6]

Yes, I would assume that something like this would be through the com.victronenergy.vebus.
It would need to look like a Multiplus to the Cerbo (I guess)....

Maybe also com.victronenergy.multi would work..

[henne49]

I planned something for shelly #32, but it was not working. This requires some rework, give it a try and you can submit a PR to include into the code. But wait until we Merged #43

[ude6]

Sounds great!

[ude6]

This looks close: https://github.com/Telekatz/venus.dbus-hoymiles

[henne49]

we did a merge, your link is a different use case. Maybe that project is a better bit for your use case

[ude6]

I will try to ask the autor there for a possible update to disble the steering of the HM input.

[Head]

Was just reading the code and then found this issue.
This project simulates the opendtu as a pvinverter: https://github.com/victronenergy/venus/wiki/dbus#pv-inverters
We would need an inverter: https://github.com/victronenergy/venus/wiki/dbus#inverter

It shouldn't be that hard to take this code and change com.victronenergy.pvinverter to com.victronenergy.inverter and also change the paths in the update funtion https://github.com/henne49/dbus-opendtu/blob/main/dbus-opendtu.py#L423 to match the ones required by the inverter interface. But maybe that should ne another project/fork of this one... Or maybe a config flag?

[henne49]

I think it needs to be a config flag, which allows for different mode. If you are interested, please create a fork and test, we can help with the code and Pull Request. We would include this into code for sure, just have no time yet to do it myself.

[dsteinkopf]

Maybe, the change #53 (based on feature request #52) will also help in this case. I will be able to configure servicename com.victronenergy.inverter.

[dsteinkopf]

Closing this because of #53. Please reopen or create a new issue if necessary.