since yesterday (01.11.2024) I added to my off-grid 3 phase (230V europe) system:
3 multiplus II (48/5000/70-50)
11.4kW (peak) panels connected to Victron SmartSolar MPPT RS 450/200
14.4 kWh battery (JK-BMS connected via serialbattery to the victron system)
a hoymiles hms-2000 with 1.23kW (peak) panels. One phase micro inverter connected to L1.
The multis have NO grid code.
All loads are connected to AC-OUT 1. The micro inverter too.
The assistant (PV inverter support) is installed on ALL the multis. The presets are NOT addopted to the hoymiles micro inverter.
The Situation:
Battery at 28%.
The moment I plug in the microinverter the frequency jumps from 50Hz to 52.7Hz. So the hoymiles disconnects and that’s it.
Today (02.11.2024) first light: The frequency jumps to 52.7Hz…
Expected behavior:
The system uses the AC coupled PV power to load the battery.
(This was tested with a Hoymiles HMS-400 without the assistants installed and worke perfektly (low light conditions DC coupled PV switched off, normal loads therefor no danger to the szstem to be operated without the assistan)
Do I habe the wrong expectations?
Can someone point me to the right direction (A RTFM with a link would be sufficient:-))?
Any help appriciated.
Best regards
Marc
P.S. Please ignore my typos:-)
P.P.S. Sorry the keywords tool is a pain in the …
You need to adjust the frequency for the hoymiles. Almost every post i have ever read about hoymiles shows them disconnecting at 51.5hz.
The defaults work for fronius
Usually DC based MPPTs are more efficient at battery charging.
This is the hint I needed. Please correct me if the following is wrong:
The system starts with the elevated frequency and reduces the frequency to see how much is AC coupled power is available. Decreasing from 52.7V doesen’t work for the hoymiles because it’'s just to high and the hoymiles never starts up.
Knowing that I will adjust the frequencies in the assistant.
Thank you!
So, new adopted frequency values
a) 50.2V
b) 51.2V
b) 52V
Observation:
Frequency rises to 51.2V. Hoymiles delivers nothing. (Due to weather conditions it should be around 35W. At least this was the case with another 50Hz source minutes before the actual test.
I leave the system now as it is until tomorrow. Let’s hope for more sun;-)
Changes:
The setup in the multis was not adjusted to my battery.
Up to now everything was DC coupled and therfore the charger settings in the multis was not adopted to the LiFePO4 batteries (Fun fact: Victron calls the battery a “LiFePo4” battery. (I wrote my profile BEFORE I saw that )
I adjusted to LiFePO4 decreased the absorption voltage to 55.2V.
After theese changes the system started to work as expected.
)