The NEM connection scheme takes the following into consideration
- Compliance to regulatory requirements
- Connection with minimum changes to the existing network
Types of Connection
For indirect Solar PV power generation system, following types are connection are required.
- Type A – required for LV customers
- Type B – required for MV/HV customers
Which type of connection be used is based on the output of the inverter at low voltage level.
Feeding methods to be used
The connection method that you can use for your Solar PV power generation can be categorized as:
- Direct Feed
This is a connection point at Distribution Licensee’s grid. Feed-in Tariff connections adopt this method. With this method, power generation and power consumption are separated and they are independently measured by different meters. Meter m1 for power consumption and m2 for power generation.
- Indirect Feed
This is a connection point at consumer’s end. While not directly connected to the Distribution Licensee’s system, this connection point exists within the consumer’s network. Self consumption and Net Energy Metering schemes adopt this method.
Like direct feed, two separate meters are used for this method as well. Meter m1 measures power consumption and export. For net metering, in order to register the export and import units, m1 will have bi-directional capability.
Meter m2 measures power generation. This dedicated PV meter records the power generated by the indirect PV generation system.
Please be mindful that as a consumer you have to bear all the costs related to the PV meter.
LV Customer Connections – Type A
This connection applies to Distribution Licensee’s consumer having a connection to LV network. At the consumer’s DB/MSB, PV connection point is established.
When a single phase inverter is used, it’s likely to not cause unbalance conditions for Distribution Licensee’s system. However, if the condition is violated, the three phase inverter requirement gets automatically enforced.
MV Customer Connections – Type B
This connection applies to Distribution Licensee’s consumer having a connection to MV network. At the consumer’s DB/MSB, PV connection point is established.
Normally, using a single phase inverter doesn’t create unbalance conditions for the Distribution Licensee’s system but if it does, then the three phase inverter’s requirement gets automatically enforced.
The consumer shall furnish the accumulated annual readings for M2 and M3 to Distribution Licensee.