System without net metering

[melvinkoshy]

Sir,

We have installed 100 kWp of SPP in different locations in our organisation in India. The configuration is as follows
Each module is 250 Wp. The strings are connected to form and array which in turn feeds 20 kW and 10 kW inverter of Delta make. From the ACDB, the cable is connected to the main LT panel at the substation. There is no battery backup for the SPP and there is no net metering as well.
I want to know the scenario when the SPP generates power more than the requirement of the facility building. Whether the power is fed back to the grid?
Whether the system can be called as a “grid-tie”system? Please help on this aspect.

Regards,
Melvin Koshy

[inetdog]

If the inverters only operate while connected to grid power, it is a grid tie system. The term grid interactive system is also used in some electrical codes.
There are several interpretations of "not having net metering" and you will have to identify in detail just what your situation is.

1. The utility does not allow any power backfeed, under penalty of disconnecting your electrical service.
2. The utility allows backfeed but does not pay you anything for that returned power,
3. The utility meter does not distinguish the direction of power flow and bills you for both amounts as if both were consumption.
4. Probably other variations on that theme.

It is possible, for a cost, to build a system which limits its output so that it only supplied power to your local loads and does not try to send any power back into the grid. It is also possible to build a system which turns on additional local loads to prevent backfeed to the grid.