ᐅ Limitation of photovoltaic system output due to subsidy conditions
Created on: 19 Jan 2021 21:45
W
WilderSueden
Here in Baden-Württemberg, the funding program for "grid-supportive storage" is being relaunched. I have just been reading through the funding conditions for the previous program and have a question about them. I had already started a thread in the subforum for construction costs/funding, but no one responded, and the question is more technical in nature.
The funding conditions state the following:
The maximum power output of the photovoltaic system at the grid connection point is a) for photovoltaic systems with up to 30 kWp capacity, 50 percent, and b) for photovoltaic systems with more than 30 kWp capacity, 60 percent of the installed capacity of the photovoltaic system. The obligation to limit the power output applies permanently for the entire lifetime of the photovoltaic system, but at least for 20 years [...]
If photovoltaic systems [...] are equipped with technical devices that fulfill the requirement according to § 9 para. 1 sentence 1 no. 1 or § 9 para. 1 sentence 2 no. 1 of the Renewable Energy Act (remote-controlled reduction of feed-in power in case of grid overload by the grid operator), the active power limitation does not apply [...]
This does not seem very economical to me. For a one-time payment of around 1000€ or so, I am only allowed to feed in half of the nominal capacity permanently. Especially in summer, the yield is quite high, and the base load in the house is unlikely to be several kilowatts without air conditioning. The battery is probably already full from mid-morning onwards.
The way out would be for the grid operator to curtail power. How often does this happen, and is the curtailment function a standard feature in inverters?
The funding conditions state the following:
The maximum power output of the photovoltaic system at the grid connection point is a) for photovoltaic systems with up to 30 kWp capacity, 50 percent, and b) for photovoltaic systems with more than 30 kWp capacity, 60 percent of the installed capacity of the photovoltaic system. The obligation to limit the power output applies permanently for the entire lifetime of the photovoltaic system, but at least for 20 years [...]
If photovoltaic systems [...] are equipped with technical devices that fulfill the requirement according to § 9 para. 1 sentence 1 no. 1 or § 9 para. 1 sentence 2 no. 1 of the Renewable Energy Act (remote-controlled reduction of feed-in power in case of grid overload by the grid operator), the active power limitation does not apply [...]
This does not seem very economical to me. For a one-time payment of around 1000€ or so, I am only allowed to feed in half of the nominal capacity permanently. Especially in summer, the yield is quite high, and the base load in the house is unlikely to be several kilowatts without air conditioning. The battery is probably already full from mid-morning onwards.
The way out would be for the grid operator to curtail power. How often does this happen, and is the curtailment function a standard feature in inverters?
In our case, the feed-in limitation applies only for 5 years, and the subsidy is three times higher. I did a rough calculation, and it really makes sense to actively counteract this with consumption optimization and charging forecasts. Twenty years is actually unreasonable, especially since no one can predict whether the storage system will still be functional after 10-plus years. Then you would have no storage left but still be subject to the limitation. I would definitely opt out of the subsidy in that situation.
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