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Reading the manual for Multiplus 2 and the appendix for three phase connection, it seems that it describes a 3-phase 400V grid (L1, L2, L3, N and PE). In a 3-phase 230V grid (L1, L2, L3, PE), what am I doing with N? And do I still need three Multiplus 2 to feed back to grid in 3-phase?
you have to have 3 phase and Neutral for incoming power and you get 3 phase and Neutral out from the inverters
If you want full 3 phase control then you need 3 x multi/Quattro inverters
you can connect PV to a single phase, but the outputs from the pv would only go to that one phase's electrical loads. There are a few diferant ways to do this Grid Tie or MPPT direct to the battery
for that matter you could just put one inverter in on one phase and run all the single phase stuff off that one inverter. and the PV only to that phase as well
ONE battery bank is used for all the inverters and the MPPT regs that charge the batteries from the solar are the most efficient way to go. usually they are around 15% more efficient then Grid Tie inverters. as these convert DC to AC then you convert AC to DC to charge the Batteries then convert DC to AC again. lots of overhead in the type of situation
using direct battery charging is DC directly to the batteries (with small MPPT loss) and then DC to AC only one step to the loads
Most inverter and Solar configurations can be setup and catered for,
The agent you are buying the gear from would be able to advise the best setup to suit your situation
Thank you for answer! First: I have one battery bank and MPPT regs to charge it directly from PV. Good to see that you recommend that! But what you say about 3-phase, does it mean that we can not establish a 3-phase system here in Norway? We have a 230V IT grid which supplies the house with 3-phase L1, L2, L3 and PE. Taking out current between L1-L2, L1-L3, L2-L3 for the different loads in the house. Or is it possible to divide PE to create both PE and N from PE?
As far as I know this is not supported, but let's call in the man who knows for a Victron answer:
@Johannes Boonstra (Victron Energy Staff) help!
Is it possible to connect like this in principle? (Will not connect double wire in MP, but use separate cables (3 x 2) all the way from the grid to MP)
No you don't want to do that.
When the unit's go into inverter mode the Neutral will be connected to earth.
Every Manual will tell you the units are not suitable for Delta connection. I don't know what will happen in practice, but I wouldn't want to try it...
https://www.victronenergy.nl/upload/documents/Manual-MultiPlus-II-48V-3k-and-5k-230V-EN-NL-FR-DE-ES-SE.pdf
I don't know if other brands support this wiring, is it possible to change the house wiring to 1 phase? or would that overload the grid connection? this way you could work with one (bigger?) inverter.
It is maybe possible to use a transformator 230v-400v and in that way create a 3-phase 400V grid in the house. But will the Multiplus then be able to feed back to the main grid through the transformator?
Any Victron staff that can answer this question? Three Phase 230V-IT (Delta) (230p-p) systems are common in Norway, only new installations use 400V TN-S (400p-p, 230p-n).
I see many gridtied inverter have the IT options on three-phase systems, why dont hybrid inverters have the same options? If it is for voltage measurement, can't PE be used for a common 0V reference?
It is already answered in the manual: not possible.
so the only way is to use one or more single phase systems, or use a transformer to create a real 3x230V+N system.
there is a reason why these systems are not longer installed, and in many places they are replaced already. (In the Netherlands some regions had this also).
As far as I know 3-phase delta grids exist in 4 countries :
- the Netherlands although only a small part of Amsterdam
- Norway
- Taiwan
- Belgium
The only inverter company which supports Delta-grids as far as I know is Solaredge. You can even switch their inverter from Delta(3L-P) to Y-grid (3L-N-P) if at one point your grid provider decides to convert from Delta to Y-grid.
Then again, they only support Delta in their range of normal solar inverters, not in their range of StoreEdge inverters which you can DC-couple to a battery system.
I'm very sad to read that Multiplus-II-inverters don't support delta-grids as this makes using Victron for my ESS-installation impossible.
@jeibre @lassestu @Carl Dewever
On the Where to Buy page, there are listed Dealerships and Suppliers for almost everywhere.
There are quite a few in Norway, Belgium. Since they exist I imagine the product still has its uses. People who live/ work with these types of systems would be more qualified to answer how they manage to install Victron 3 Phase systems under these conditions. Most of the world uses Neutral Ground connections even in backward Africa.
And parts of Belgium have them this star-grid but a large part of Belgium still has a 3-phase delta-grid
@jeibre Hei :=) hvordan ble enden på visa - 230IT / Victron? jeg jobber med det samme problemet og kobler opp min MP 5KVA på en av fasene og setter ESS limit grid retur på 10 eller 16A.
Takk for svar hvis du har tid.
(Gid jeg hadde 400TN...)
