2023-12-18 08:00:00
Question from Olivier: I have had photovoltaic panels for some time now. I would like to add more following January 1, 2024. Do I keep the same diet or not?
It is possible to install additional photovoltaic panels following January 2024 and keep your meter running backwards, under certain conditions, explains Jérémy Kroonen, at Enersol.
It depends on the power in electrical kilowatts (kWe). kWe are the unit of measurement in which the net developable electrical power of the installation is expressed. The net developable electrical power (Pend) is the electrical power generated by the electricity production installation before possible transformation to the network. The Pend is obtained by deducting the average power of the installation’s functional equipment from the maximum achievable power expressed in kWe.
How much increase is allowed?
“If the power in kWe does not increase by more than 1 – either at the level of the power of the inverter, or at the level of that of the panels (the smaller of the two) – we can keep the compensation regime. » explains Mr. Kroonen.
What does it mean? “We will be able to do an extension in 2024 if we currently have an inverter whose power is smaller than that of the panels. We can put an inverter of 1 kWe more.”
But in the opposite case, if we today have an inverter more powerful than the panels (which is rarely the case, because the optimal sizing is 80%), we can only increase the power of the panels by 1 kWe. “If it is the power of the panels that can be increased, that only represents one or two panels. But if we change the power of the inverter, as we can overload them much more currently, it happens that we can increase by 3000, 4000 peak watts. It’s really on a case-by-case basis.”
Jérémy Kroonen estimates that with current installations, in 8 out of 10 cases we can make extensions while maintaining the compensation regime, “sometimes by limiting the power”.
And he adds: “The interest, if we modify the inverter, is to install a hybrid inverter, which will be capable of working with batteries in 2030, when there will no longer be compensation.”
And the batteries? A Walloon battery
In short, if you plan to modify your photovoltaic installation in 2024, either at the panel level or at the inverter level, check carefully with a professional whether this has an impact on your meter or not.
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