I have made quite the research but i can’t find anything solid.
I am having a Huawei SUN2000-5KTL-L1 grid-tie inverter with 10Kwh of Luna2000 batteries, working on zero-export mode.
Due to constant grid failures on my region, i want to add a MP-II 5000VA with 4Kwh of lithium batteries and connect the Huawei inverter at the AC-OUT of the MP-II.
My question: Is there a way to actively control the export of the Huawei inverter so that i can charge the MP-II batteries when i have the Lunas full charged?
At my reaseach i found that only a few of Huawei inverters have huawei’s overfrequency derating option (frequency swift) and my inverter is not one of them.
Have any member manage to make those two inverters work together, and if how so?
Possibly. Does it have modbus or rs485. Do you know how to integrate with it that way and use node red?
Another feature that is being worked on is virtual devices in Beta on the GXS where these types of devices can be integrated. Not too well clues uo here with it with your application though, so is an idea for you to explore further.
Other rather crude way is to use ac out 2 and switch it on and off like a generator. I do know of some guys who have done this fairly successfully.
I managed to set frequency shifting on my SUN2000-4KTL. So I am wondering why on the 5-KTL it would not be possible. Documentation from Huawei is not very clear and refers only to higher series for frequency shifting. If you log into the invertor with the app you will see options to set it up, working with 3 frequency’s 50.2, 51.48 and 51.5 ( Europe settings).
Between 50.2 and 51.48 hz it will decrease power, 51.5 hz will cause zero power.
I will check the settings and share screendumps of sun2000 app.
The frequencies 50.2, 51.48 and 51.5hz are default settings, which means that in the ESS assistant the values have to be the same.
The offgrid mode for the pv inverter is not allowed , at least not in the Netherlands. This is something completely different then the settings for reducing power, even to zero.
If the pv inverter is located on ac out of multiplus the pv inverter still “thinks” there is an on grid situation.
This is in Dutch, you can find settings in current adjustment, reducing at over frequency should be on. So system should start reducing at 50.2hz and go to zero at 51.5hz. Maybe you can post your settings on the current adjustment (might be other name).
We are using gridcode for the Netherlands for Huawei. For Victron I used European grid code, NL was not available. Most of the settings match, so no problems there.
Apparently IEC61727 doesn’t allow frequency derating. I changed the grid code to one other European that meets the my grid characteristics and the frequency derating settings showed up.
Next step is to finish the installation of the victron system and see if it works optimally.
Thanks everyone for the shared Intel that lead to solution.
I am now working on an extra failsafe if frequency shifting should fail for whatever reason. I found the option to trigger rapid shutdown of Huawei pv by triggering a relais which switches pinning on comms input (pin 13 and 15) This works via my alarm system with dedicated automation option on the app. The relais can also be triggered via the Cerbo relais on Victron which will be set via Node red, depending on both AC-in absence and 100% charge level of battery.
