240v 3ph delta high leg

[nateb81]

what is the proper. way to design a solaredge system to ty to a 240v 3ph delta high leg system? Thanks

 

[jaggedben]

The proper way would be to inquire to the utility how much backfeed they'll allow and on which phases, before buying inverters.

The utility may only want you to backfeed the split-phase with neutral and leave the high-leg alone. (This is likely on an open delta.)

Or if the service is a true closed delta, they may want you to backfeed all three phases in balance. In this case, I believe since Solaredge does not make 240V 3-phase inverters you would need to use single-phase inverters on each phase. See this recent thread for more on that.

 

[ggunn]

The proper way would be to inquire to the utility how much backfeed they'll allow and on which phases, before buying inverters.

The utility may only want you to backfeed the split-phase with neutral and leave the high-leg alone. (This is likely on an open delta.)

Or if the service is a true closed delta, they may want you to backfeed all three phases in balance. In this case, I believe since Solaredge does not make 240V 3-phase inverters you would need to use single-phase inverters on each phase. See this recent thread for more on that.

Or a transformer.

 

[BackCountry]

what is the proper. way to design a solaredge system to ty to a 240v 3ph delta high leg system? Thanks

You’d only backfeed the single phase L-N 120v legs, not the stinger leg.

Remember, on a high leg delta the tx’s are usually different sizes. Your utility will set the stage.

 

[electrofelon]

Or a transformer.

Can you elaborate gunny?

 

[ggunn]

Can you elaborate gunny?

With a three phase transformer you can connect a 480/277V or 208/120V inverter to a 240/120V high leg service. Of course, you will have to verify that the 208V to neutral line is driven by a large enough utility transformer to handle the PV output and that the utility is OK with it.

 

[electrofelon]

With a three phase transformer you can connect a 480/277V or 208/120V inverter to a 240/120V high leg service. Of course, you will have to verify that the 208V to neutral line is driven by a large enough utility transformer to handle the PV output and that the utility is OK with it.

Oh okay I missed the "solar edge doesn't make 240 volt three phase inverters part", so thought you were saying a transformer could make connection of single phase inverters better for some reason.