When is a bidirectional green power meter mandatory with a home battery?
A bidirectional green power meter is mandatory when you have solar panels that are still eligible for green power certificates, use a hybrid inverter, and have a home battery connected to the DC side of the installation. In this situation, Fluvius must be able to determine exactly which electricity actually comes from the solar panels and which energy might come from the grid.
A traditional green power meter records all energy flowing towards the indoor installation or the grid, without distinguishing between green power from the solar panels and gray power from the grid. This can lead to an overestimation of the installation’s production, which may result in incorrect allocation of green power certificates or even reclaims during a Fluvius inspection.
A bidirectional green power meter solves this problem by recording both injection and withdrawal separately:
• Injection: green power from the solar panels
• Withdrawal: electricity from the grid
This ensures that actual solar production is correctly calculated and recorded.
The meter records two separate energy flows:
• Green power from the solar panels to the battery, the home, or the grid
• Gray power from the grid to the battery or the home
Fluvius then calculates the net green power based on this data. The meter automatically processes the injection and withdrawal registers, eliminating the need for manual corrections. This ensures accurate production recording and the correct allocation of green power certificates.
Permitted
An analog green power meter that can run backward and has no backstop.
Not recommended
Installing an additional kWh meter and manually correcting the production. This is prone to error, administratively cumbersome, and legally less robust.
Recommended
Installing a bidirectional green power meter. This is the simplest, most reliable solution and is recommended by Fluvius.
A bidirectional green power meter must:
• Be able to measure in both directions (injection and withdrawal)
• Have at least accuracy class 2
• Be equipped with a valid MID calibration
• Be officially accepted for the registration of green power certificates
The replacement of the green power meter must always be reported via My Fluvius.
When applying, you must include the following documents, among others:
• Photo of the starting reading of the new meter
• Photo of the final reading of the old meter
• Photo of both serial numbers
• Home battery details
• Any inspection documents
Not always.
A new inspection is generally required when:
• The inverter is replaced
• The electrical safeguards are modified
A new inspection is usually not necessary when only the green power meter is replaced.
Even when no new inspection is required, reporting the change to Fluvius remains mandatory.
Do you still have green power certificates, a hybrid inverter, and a DC-coupled home battery? Then a bidirectional green power meter is generally necessary to correctly record your production and avoid issues with green power certificates. The meter ensures that only the solar energy actually generated is counted, keeping your installation fully compliant with Fluvius guidelines.
