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Connect in parallel two systems: inverter + battery over DC bus

Teslaidea

New Member
Joined
Dec 25, 2024
Messages
3
Location
France
Hi,
Il would like to explain my idea to connect in parallel two inverters and their battery.
The two systems are the same: inverter SUN2000 (SUN2000-6KTL-L1 monophase) and a battery LUNA2000 10 kWh. But they are connected to two different AC phases, so i cannot use the AC coupling.
My idea is to connect these two inverters using the DC bus / battery bus, which is after the MPPT block, as you can see in the image, so a DC coupling.

My scope is to create a macro-system where the two inverters are normally indipendent with their PV array, but if there is a surplus of energy from one side (not necessary stored in the battery but only by PV, in this phase of the project) can be used by the other inverter and the energy will be transported by the dc bus.

Obviously, I need to protect the connection of the dc buses by overpower with fuses, because for example the batteries can give up to 5 kW.

Have anyone test this electrical connection? In your opinion, Will this connection work or not?

Thank you so much

Happy holidays
 

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You have 3-phase power? Some inverters can be set up for 3-phase and share batteries, not sure about yours. What does the manual say?
 
Hi,
I have 2 single-phase power and they don't came from the same phase....
Obviously, my idea is not indicated in the manuals.... If you want to see the allowed connections search online the manual of LUNA2000, inside you can find the correct connections.

Thank you
 
You have 3-phase power? Some inverters can be set up for 3-phase and share batteries, not sure about yours. What does the manual say?
That’s a high-voltage battery, and while there are scenarios in the manual for 3-phase Wye, it’s not clear how the battery is shared.
 
Hi,
I have 2 single-phase power and they don't came from the same phase....
Obviously, my idea is not indicated in the manuals.... If you want to see the allowed connections search online the manual of LUNA2000, inside you can find the correct connections.

Thank you
You have 2 of three phases of a 3-phase system?

This DIY forum is going to require you to understand the system you are trying to implement.
 
Yes, I have two monophase contract, where for each is connected an inverter and a battery pack.

Sorry, but Huawei shows only this internal schematic....
 

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