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Can I mix different inverters in parallel

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marneth

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G'day all, I have recently upgraded my system from a 3 phase solar string inverter to a hybrid 3 phase inverter with battery storage. Both inverters are 10kw. I would like to expand my array from 13.4kw to 20kw. Can I use the original inverter in parallel, non hybrid, with my new hybrid system? Currently my battery capacity is 18kwh but is expandable to 32kwh. I am connected to the grid and can feed in 15kwh per day max. I assume any extra feed in above this will just go unpaid for if that happens.
Cheers marneth
 
Yes, if the new hybrid inverter is capable of AC coupling. And if the original inverter is also compatible with the standards of the hybrid model.
 
timselectric said:
Yes, if the new hybrid inverter is capable of AC coupling. And if the original inverter is also compatible with the standards of the hybrid model.
Click to expand...
The new hybrid inverter is DC coupled so I'm guessing it won't be compatible as the old one will be AC coupled.
 
Some are capable of both AC and DC coupling.
The owners manual will have that information.
 
Hybrid inverters will not acquire sync from AC output port. Initial synchronization sensing is on AC input port, prior to pass-through relay closing.

You cannot use AC coupling to couple two independent hybrid inverters outputs. Both units will assume they are phase masters causing a clash between the two inverters.

On a hybrid inverter, when AC pass-through relay is closed, it follows the leader (AC input), when AC pass-through relay is open, it is its own phase master. (unless it has paralleling control link interface to assign control sync)

Inverter-generators do not have an AC input and use a different mechanism to sync two parallel inverter-generators. On inverter-generators, IF there is AC voltage present on its output when inverter-generator is started it will take its synchronization from the applied AC source to output port. You must start one inverter-generator first before starting the second. The second inverter-generator will continue to be a slave, maintaining sync with the first started unit.
 
Last edited:
RCinFLA said:
Hybrid inverters will not acquire sync from AC output port. Initial synchronization sensing is on AC input port, prior to pass-through relay closing.

You cannot use AC coupling to couple two independent hybrid inverters outputs. Both units will assume they are phase masters causing a clash between the two inverters.

On a hybrid inverter, when AC pass-through relay is closed, it follows the leader (AC input), when AC pass-through relay is open, it is its own phase master. (unless it has paralleling control link interface to assign control sync)

Inverter-generators do not have an AC input and use a different mechanism to sync two parallel inverter-generators. On inverter-generators, IF there is AC voltage present on its output when inverter-generator is started it will take its synchronization from the applied AC source to output port. You must start one inverter-generator first before starting the second. The second inverter-generator will continue to be a slave, maintaining sync with the first started unit.
Click to expand...
It's not two hybrid inverters.
It's one hybrid inverter and a grid-tied string inverter.
 
I got a similar installation but my on grid is 300KW, and i want to install a 12kwh hybrid inverter with storage battery. but it seems not working. I know that Victron can work with Fronius like this, but why other brands cannot? the diagram is as below:
1677221293617.jpeg
 
robot a said:
please did you eventually achieve this?
Click to expand...
Put a CT on the Grid line between the Deye and Fronius, and set the Deye to Limit to Home. But, it won't use the PV from the Fronius in the calculation.

Put a CT on the Grid Line between incoming Grid and Fronius:
1) Put the Grid Line into the Load Port of the Deye
2) Tell the Deye that AC PV on Load

In both instances, I would not recommend running off-grid (grid down).

What will work off grid:
1) Put AC Load on Load line of Deye
2) Put Grid into the Grid line of the Deye
3) Put the Fronious into the Smart Load (Gen Port) of the Deye
4) Tell Deye there is AC PV on the Smart Load port
 
RCinFLA said:
Hybrid inverters will not acquire sync from AC output port. Initial synchronization sensing is on AC input port, prior to pass-through relay closing.

You cannot use AC coupling to couple two independent hybrid inverters outputs. Both units will assume they are phase masters causing a clash between the two inverters.

On a hybrid inverter, when AC pass-through relay is closed, it follows the leader (AC input), when AC pass-through relay is open, it is its own phase master. (unless it has paralleling control link interface to assign control sync)

Inverter-generators do not have an AC input and use a different mechanism to sync two parallel inverter-generators. On inverter-generators, IF there is AC voltage present on its output when inverter-generator is started it will take its synchronization from the applied AC source to output port. You must start one inverter-generator first before starting the second. The second inverter-generator will continue to be a slave, maintaining sync with the first started unit.
Click to expand...
That's not always true. It depends on the style of the hybrid inverter. Many do have separate AC input and output connections. But there is a 2nd style that only has a single AC connection. The second style often can be connected in parallel. They also always work along with an automatic grid disconnect switch. Then the grid disconnect switch is open, at least one of the hybrid inverters generates the AC waveform. When the grid disconnect switch is closed, they sync to the grid waveform. Examples of the 2nd style: Tesla Power, SMA Sunny Boy Storage, GoodWE ES-US series. The main advantages of the 2nd style is you don't need separate grid and backup breaker panels and the ability to run multiple inverters in parallel to expand capacity as needed.
 
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