Roof Top Solar Power Net Metering Solution

Rooftop spaces and small areas around residential, commercial and Industrial buildings are high potential areas for Renewable power generation like Solar and Wind energy. Small quantities of power generated by each  buildings or any other type of building can be used to partly fulfill the requirement of the building occupants and surplus, if any, can be fed into the grid. The distribution companies will allow power to feed into the grid and extending net metering facility to the consumers.

1. Net Metering arrangement is permitted for 3 Phase connections only. The interconnection schematic is enclosed in Appendix A to these guidelines.

2. Consumers can avail Government of AP subsidy and MNRE subsidy, as applicable, in installation of solar power net metering solutions through NREDCAP.

3. Entire circuitry (Appendix A), including panels, inverter, bidirectional meters, cabling, manual switch, safety circuit breaker etc., should be installed by the vendor under a turnkey approach.

4. Mandatory safety precautions/features which have to be installed as part of SPV system are:
i. Certified Inverter controlled relays which can trip on grid failure and thus prevent any solar power injection to Grid when there is no power in Grid.
ii. Solar Circuit should be separately grounded/ earthed.
iii. Additional switchgear/relay (sensing phase-angle shift) required as a second rung of safety. It shall be positioned between interconnection point and the bi-directional meter
iv. Harmonics suppression/Filtering feature in the inverter for local network’s safety and for accurate measurement of energy.

• Utilization of vacant rooftop for power generation.
• Can generate power for self-consumption and feed excess power to the Grid.
• Provision for settlement of registered surplus energy fed to the grid on a half yearly basis.
• Surplus energy injected shall be considered for payment by the DISCOM at pooled cost

Source: Nedcap & adnpcl

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