Hallo Everybody,
Have somebody experience with 3 Phase System as off-grid system? it is stable enough for a House with inductive cooking plates and other problematic loads?
I’m asking because my 3x MP2 3000 system is too weak and I’m thinking about upgrading. At the moment the system is running as ESS but off-grid would be conceivable. I would also like to put more solar cells on the roof and with the Multi RS Solar I would have 6 trackers with 3 KW each.
sorry for my english, google translator had to help.
My Multi RS on a single phase off-grid configuration is handling just well any of the followings.
The power specified in the parenthesis is the power reported by the Multi RS when the specified load is functioning.
- Inductive cooking plate (2kW)
- Microwave oven (1.5kW)
- Air conditioner unit (1.5kW)
I’ve mentioned above just the “problematic” loads as you’ve said, because pure resistive ones like the ones below are also no problem:
- Washing machine heating element (1.5kW)
- Clothes iron (2kW)
Any combinations of the above up to almost 5kW were a go.
So, you see, I can’t see any inconveniences for having a tri-phase system with Multi RSes.
Thanks for the information. Has the device ever been overloaded with 6 KW or more?
Has anyone actually operated the system as 3 phases?
No, no overload.
It seems that the “consumption education” given to my wife was successful. At least until now… 
My 3x mp2 3000 are sufficient for the house loads. It only becomes difficult if the car is to be charged as well and I then have to interrupt the charging of the vehicles or set it to 6A so that I don’t have to draw power from the mains.
Well… EV charging is a different story…
Maybe you should invest in some AC coupled, PV inverters like Fronius or so, for charging EVs.
Or, if you still want to use only Multi RS-es, then in a considerable battery bank, at least of a capacity like the car’s battery, so you can charge slowly during day and still continue to charge it during the night from the day accumulation.
The Loads are on AC-Out1 or AC-Out2?
AC-Out1, as I am using the system in an off-grid manner, even if I have grid. The input relay is kept disconnected.
AC-Out2 is just a direct connection to AC-In.
I keep forgetting that the RS works that way, different to multis and quattros.
AC2 output is not programmable or relay controlled
AC2 output is internally hard wired to the AC input. There is no internal relay contact switch that is able to disconnect, or reconnect it via programming. There is also no delay from when the AC input is connected to when it flows through to the AC2 output.
In three phase, it still has the limit of the power of a single unit on each phase.
The max power is related to two things
- Battery voltage (derating for lower voltages)
- How much solar is able to assist with loads. I have a customer who regularly runs higher than the 6kVa on loads. Not a problem unless it gets hot. See note 7.
Behaviour in overload is described here.
The power assist feature is also interesting.
I thought the Victron Multi RS Solar cannot be operated parallel to the grid. How can you ensure that it does not feed in electricity?
Firmware is not allowing it to do so…
Or, for making sure, you can program the input relay to stay disconnected.