Photovoltaic panel metering rules

PV Interconnection: Load-Side vs. Line-Side

a) The power exported to the grid is measurable and compliant with the grid''s standards regarding voltage, frequency, and power quality. b) The AC side of the PV system (between the inverter and the utility meter) meets the utility''s safety

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About Photovoltaic panel metering rules

Under net metering, the energy produced by your solar panels that you don’t use is credited back to you. On a cloudy or rainy day when your panels aren't producing enough energy, the utility grid will feed your home energy and count that energy against the credits you've banked over time.

There are two basic approaches to connecting a grid-tied solar panel system, as shown in the wiring diagrams below. The most common is a "LOAD SIDE" connection, made AFTER the main breaker. The alternative is a "LINE OR SUPPLY-SIDE" connection made BEFORE the main breaker.

You're a supplier when your PV system is generating more power than you need and the excess flows into the electric system. Measuring the flow of electricity in two directions requires a “net meter.” Your meter has two registers, both going forward but one at a time.

FPL works closely with customers and contractors to ensure safe, efficient grid interconnections for renewable generation, such as solar panels. Customers with grid-interconnected renewable generation can participate in FPL’s net-metering program. The goal of net metering is to offset all or part of the customer's energy use at the customer's .

The National Electric Code allows for a few different ways to interconnect PV systems to utility systems. In two editions of Code Corner, Ryan Mayfield with Mayfield Renewables, explains busbar, load side interconnections in 705.12 (B) (3) (1) and (2), and then supply side connections in 705.11 (C) and (D). Mayfield Renewables Code Corner .

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6 FAQs about [Photovoltaic panel metering rules]

Which side of a PV system meets the utility metering requirements?

b) The AC side of the PV system (between the inverter and the utility meter) meets the utility's safety requirements (labeling, location of equipment, connection to electric panel). c) The power and energy generated meet net metering program requirements.

Does net metering apply to solar?

Net metering doesn't just apply to solar, either. Solar net metering is by far the most common type, but depending on the net metering rules in your state, you may be able to net meter with other types of distributed generation systems, like wind turbines. Do net metering credits expire? How do electricity bills work with net metering?

Are solar customers grandfathered into their net metering policy?

This is a big one: existing solar customers – and people who went solar before NEM 3.0 went into effect (through April 14) – were grandfathered into their original net metering policy. Solar shoppers who submitted interconnection applications after April 14, 2023, fall under NEM 3.0.

Can a solar meter be connected to a utility meter?

The customer’s system must adhere to National Electric Code (NEC) Article 690 - Solar Photovoltaic (PV) Systems. Interconnections with the utility transformer or in the meter can are not permitted. Customer generation is limited to 90 percent of the FPL service capacity. FPL will upsize facilities for customer generation at the customer’s expense.

How does a utility verify a photovoltaic system?

The utility will only permit the photovoltaic system to interact with the power grid after issuing a formal approval. The process through which a utility verifies a solar system's compliance with its technical and administrative requirements is commonly referred to as the interconnection process.

How did California's Net metering policy affect PG&E & SCE customers?

The changes to California's net metering policy cut the value of solar energy credits by about 75 percent for PG&E, SCE, and SDG&E customers. This is a big one: existing solar customers – and people who went solar before NEM 3.0 went into effect (through April 14) – were grandfathered into their original net metering policy.