2 Different Hybrid Solar Inverters

Hi Everyone,

I have two different 48v hybrid solar inverters, they both output 120v AC. Can I connect them both to the same 48v battery bank, while connecting to a subpanel? Each inverter connection to the subpanel will be on a separate pole, would I be able to get 240v out of the panel without any issues? Hope what I am asking makes sense.
Thanks in advance.

-RB

riotbob said:

Each inverter connection to the subpanel will be on a separate pole, would I be able to get 240v out of the panel without any issues?

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No! It takes a special coordination between inverters that are specifically made to create such a split phase 240VAC output.

Definitely not. The two lines need to be in sync (same frequency and phase locked) and that requires a special communications cable between the inverters

MisterSandals said:

No! It takes a special coordination between inverters that are specifically made to create such a split phase 240VAC output.

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LOL, got it! Thank you!

What if one of my hybrid solar inverter can output 240vac, can I connect it to one of the sub panel pole while the other pole is being fed by a 120v hybrid solar inverter? Curious and seeing my options. Thanks!

zanydroid said:

Definitely not. The two lines need to be in sync (same frequency and phase locked) and that requires a special communications cable between the inverters

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Thanks, Zanydroid

riotbob3 said:

LOL, got it! Thank you!

What if one of my hybrid solar inverter can output 240vac, can I connect it to one of the sub panel pole while the other pole is being fed by a 120v hybrid solar inverter? Curious and seeing my options. Thanks!

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No, I would suggest sketching out the return current flow and visualizing how the AC voltage synchronization might interact. You'll get in trouble with one or both of those.

Also outputing 240vac instead of 120/240 is itself a red flag. That indicates either using grid tie equipment (and having to form neutral when operating off grid with EG an autotransformer interlocked to a transfer switch). Or using a overseas 230V hardware which nobody in 2023 should consider using with all the native 120/240 hardware readily available domestically these days. And that 230V hardware also needs some tricky bonding and transformer conversion to make work, which DIYers shouldn't force themselves to deal with in 2023

On grid may work (inverter syncs to grid). Grid down is a problem.

DIYrich said:

On grid may work (inverter syncs to grid). Grid down is a problem.

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Pretty unlikely to have a 120V grid tie inverter in the US. (Vast majority case is to have a 240V only one)

zanydroid said:

Pretty unlikely to have a 120V grid tie inverter in the US. (Vast majority case is to have a 240V only one)

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You can use a 120v off-grid inverter and put the Grid into the AC Input. It will sync to the grid like it syncs to the generator. You can put a separate inverter to the other leg of 120/240v split phase. The problem comes in with grid down. Without the grid, there is nothing for the inverters to sync to (maybe a 240v split phase generator).

Might be able to use an auto transformer between the two. Output of Inverter A to Line 1 of Auto Transformer. Line 2 of Auto Transformer to AC Input of Inverter b.