Parallel inverters for only two phases

Hello to all forum members

I am interested in purchasing the Chinese PowMr 5KVa inverter with parallel support (https://aliexpress.com/item/1005003504543048.html).

I have three phases at home, but I want to use ONLY TWO. Is it possible to connect ONLY TWO such inverters ON TWO DIFFERENT PHASES in parallel?

This is what my connection would look like:


Planned configuration:




Here is the manual for the parallel connection module: https://www.mppsolar.com/v3/catalogs/PIP-HS_MS Parallel Guide.pdf

Will it work?

It's not possible to give a complete answer to your question of "Will it work?" because there is no information regarding the voltages & frequency for the incoming and outgoing power in relation to the model number of the Inverter. Also its not clear how the utility neutral is intended to be used if at all.

It looks like you are confusing terminology. There is technically no such thing as "2 phase". There is either single phase, which consists of 2 "hot" wires because the current has to go around in a loop or there is 3 phase, which consists of 3 "hot" wires. In both cases there CAN be a neutral but its not required depending the equipment needs.
The factory supplied diagrams do refer to one of the Inverter 'legs" as N but that is misleading since it would actually be tied to one of the hot legs in your proposed use case.
The fact that you have 3 phase available is irrelevant since your diagram indicates L3 will not be used at all, your system simply becomes single phase. Lastly, there should always be a Ground that ties all the system chassis & exposed metal parts to earth ground.

Assuming you are not using L3 or the Utility Neutral, Menu item #28 would be set to PAL on Both Inverters and you would need to connect the power share wires (green dotted lines) as per the top diagram on page 5 for Two Inverters in Parallel:

Perhaps a more definite answer could be provided if we know what appliances or equipment you were going to operate on the Inverters.

INPUT VOLTAGE 230V (50Hz)
OUTPUT VOLTAGE 230V (50Hz)
(EUROPE/POLAND)

The mains utility neutral wire is only used to connect the inverters (not connected in the house distribution box).
I will use utility neutral N wire (the same for first and second inverter), so I think Menu item #28 would be set 3P1 and 3P2.

My utility network work in TNC type.



Are you sure that inverter P1 and P2 works in parallel with the same phase?
I think voltage between PEN <-> L1 and between PEN <-> L2 are NOT THE SAME (this is not the same phase).

Apologies, I didn't do a good job of explaining my train of thought. You are correct in your diagram, you would basically be trying to do a set up that is 2/3 of a 3 phase system. What I was attempting to do was suggest a more conventional way of setting up the system. Either just use L1 & N for both inverters (if L1 has enough capacity) and run them in parallel to double the output power. The other way would be to use L1 & N for one inverter and L2 & N for the other inverter and then #28 would be set to SIG and each inverter would be independent.
The downside of course is that the outputs would not be sychronized at 120 degrees out of phase and you wouldn't necessarily have the 400V for a 2 pole breaker (not sure what your Line to Line voltage is) available.

Perhaps it would be worth your time to ask the manufacturer if their engineers could answer your question. What you are attempting is a bit unusual and the equipment warranty may become an issue.

I know the topic is problematic.

Assuming that I would connect three inverters to three phases (without the current sharing wires), could I connect the PV panels only to ONE inverter, and the rest could use this power? Apart from the shared use of batteries (I know it works).

Does each inverter require a separate connection of PV panels?