Solar production between two services.

[scrumi]

I have a customer that would like to be able to switch his solar production between two seperate electrical services from the same utility. The first service is the residential rate schedule and the second is the irrigation rate schedule.

It is somewhat unique as the irrigation service is a 3 phase high leg delta I did get permission from the utility to backfeed two of the three legs because of the configuration and I don't have to phase balance. So I can use single phase inverters to connect to either service.

there will be 22.5kW of solar production at peak and my plan was to run it into a manual transfer switch so they can just switch production between services.

The local inspector is a little confused about this and isn't sure it is possible I'd like to be able to point him the right direction.

 

[GoldDigger]

There is nothing in the NEC that prohibits this, as long as POCO is OK with it.
The job of the inspector is to consider the two configurations (the two positions of the MTS) as if they were independent systems that each must satisfy the NEC rules.
It is likely that there will be an unavoidable five minute loss of production each time the switch is thrown since the grid characteristics must be requalified after any interruption.

Sent from my XT1585 using Tapatalk

 

[ggunn]

I have a customer that would like to be able to switch his solar production between two seperate electrical services from the same utility. The first service is the residential rate schedule and the second is the irrigation rate schedule.

It is somewhat unique as the irrigation service is a 3 phase high leg delta I did get permission from the utility to backfeed two of the three legs because of the configuration and I don't have to phase balance. So I can use single phase inverters to connect to either service.

there will be 22.5kW of solar production at peak and my plan was to run it into a manual transfer switch so they can just switch production between services.

The local inspector is a little confused about this and isn't sure it is possible I'd like to be able to point him the right direction.

It may not be a NEC violation but no AHJ I deal with would allow it.