@simonmj1000
With OpenDTU you can adjust the inverter Limit on Hoymiles. I am not aware of any integration into the Victron eco system providing dynamic limiting based on AC feedin=no. And I do not know if OpenDTU can accept setting the limit via MPTT or other interfaces.
If you are to program, maybe you can adjust dbus-OpenDTU to obey the feed-in restriction.
Thanks have ordered the OpenDTU HW if that works then i will use an MP2(s)
BTW if your are interested here the link for 0 export using MP2 GitHub - reserve85/HoymilesZeroExport: Zero Export Script for Hoymiles Inverters using AhoyDTU / OpenDTU and Tasmota Smart Meter inferface / Shelly 3EM / SHRDZM / Emlog / ioBroker
Thanks for the Reply’s. In my setup which is ground based near the house. The options I have are:
1, MP2 + Hoymiles if this can be made to work with 0 feed in
2, MP2 + Fronius ok but Fronius is more expensive than 1
3, MP2 + MPPT DC
1 and 2 have the advantages of PV-AC at Source (near the panels in my case is an advantage as its reduces the length of solar cables) compared to 3 and also allows more flexible placement of the MP2(s)
Next steps are I will buy the MP2 (5K) and see if I can get the 0 feed in to work with Hoymiles openDTU with the current panels. If that fails I will probably buy the Fronius.
For the majority of PV usw. a Victron MPPT.
Optionally use a Fronius (can be throttled natevely via Modbus over IP). Use max 4 panels one one HMS-1600/1800/2000-4t for AC-PV.
One MP2 5K can load 3,5kW from AC-PV into battery.
Thanks, I have ordered 2 MP2 5000 and separate GX. Will keep the Hoymiles which I have authorisation for upto 3Kw grid injection. I will then add MPPTs for the rest.
All the best Simon
Also sounds like a very good solution, Would love to do something similar but we can not get any extra dc wires from the roof to the place where the Batteries are. Would love to have some dc to dc mppts in the future:) or 3 fase multirs’s:) But on a one fase grid connection it is somewhat difficult.