I have a multiplus II with a couple of mppts, a battery and is connected to grid. (ESS)
(Grid setpoint -20W)
All is working fine but I want to connect a micro inverter (Hoymiles) to the system on L2/L3.
Today my Victron system is connected to L1.
In a perfect world I would connect the micro inverter to L2/L3 and my Victron system would see the extra production and not get confused with a gridpoint set to -20W.
Use an “OpenDTU” to read out the Hoymiles using the properietery Nordic radio protocol.
Forwqard the values from OpenDTU via MQTT to Venus OS / Cerbo GX.
Integrate the data via “dbus-opendtu” with appropiate configuration naming which hoymiles is on which phase.
I have this running wiht 4 HMS-2000/1000 and one HH-600 on different phases. Works like charm.
If the hoymiles are connected to AC_in, they will stich of in case of grid falues.
If you connect them/some on AC_out_1 of the MP2, you need to obey the "factor 1 rule! and confifure PV assistant to increase network frequnency in case of SOC becomes 100%. Latests at 53Hz the Hoymiles will shut down, but there is a power derating curve according AR-N-4105.
Thanks.
I am thinking of connecting the Hoymiles to L2/L3 and integrate it with
In that way I will get the solar production in to my VRM.
@BjoernK Are you running your system with ESS? How are you handling the “grid set point” ?
If my house is using less power than the hoymiles produces do I sell the surplus or will my Multiplus charge the batteries?
Yes, ESS. GridSetPoint=0W.
If HMs produce more than current consumption, the MP2 load the diff into battery.
That’s exactly the purpose of an ESS.
Depending on your country, a MP2 on L1 can load from L2/L3 (net metering, like in DE).
Just a remark:
Assuming your system ist grid connected and the
Battery is full:
Sun is shining->hoymiles is producing more than you can consume.
In that scenario it is NOT possible for the victron system to hold the grid setpoint (-20W in your case).
The access power is fed into the grid.
Reason:
Due to the fixed frequency which is provided by the grid the victron system cannot increase the frequency. Therefore an AC-out connected hoymiles (any AC-coupled Inverter (Exception: may be a modbus controlled device)) does not reduce the power.
AC-in connected: there is no way to controll the micro-inverter.
REMARK to the remark:
If you use hoymiles with openDTU or ahoyDTU you can set the output power of the hoymiles and controll it that way. But further programming is needed.
Have fun
Marc
P.S. this was ment for @kent2ben . Sorry I always mess up with the reply function.
