ᐅ Heat pump combined with photovoltaic system, with or without energy storage
Created on: 4 Apr 2020 23:29
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Heidi1965
We are planning a new build with an air source heat pump. The electricity will come from our own photovoltaic system. Now the question arises whether a storage battery makes sense or not. The house is 10 meters (33 feet) wide and 14.5 meters (48 feet) long. The main apartment is on the ground floor. The attic will be partially converted into a one-person apartment. Later, we plan to have an electric car.
The installer gave us the following offer:
Heat pump Novelan 9-HSDV 12
Storage BYD Battery-Box Premium HVS 5.1 with Fronius Symo Hybrid 5.0-3-S
15 Trina Solar 340 TSM-DE06M.08 modules; some of the modules on the east side, some on the west side (house faces north-south)
Does this all make sense? Are these components compatible? Does anyone have experience with these brands?
The installer gave us the following offer:
Heat pump Novelan 9-HSDV 12
Storage BYD Battery-Box Premium HVS 5.1 with Fronius Symo Hybrid 5.0-3-S
15 Trina Solar 340 TSM-DE06M.08 modules; some of the modules on the east side, some on the west side (house faces north-south)
Does this all make sense? Are these components compatible? Does anyone have experience with these brands?
Fuchur schrieb:
I used to be against batteries as well – but we ended up ordering our photovoltaic system with a battery. You really have to calculate everything carefully. The solar system especially needs to be large enough to fully recharge the battery, otherwise, it won’t generate anything during winter. No one knows what will happen with the Renewable Energy Act. During the COVID pandemic, it’s not a priority, and it’s increasingly likely that no successor regulation will come into effect before the cap is lifted, meaning there would no longer be guaranteed compensation. Then, only self-consumption (with a battery) remains.
The note about retrofitting is correct. However, you can only reclaim the VAT on the battery when you purchase the system initially. Retrofitting later does not qualify.
What convinced us were the dropped prices, the tax refund, and a regional funding program. This means the 11.2 kWh battery now costs us effectively only 4,300€ (euros). And we will soon have almost 29 kWp on the roof. That way, the heat pump can still draw some energy in winter. Could you share the calculation here?
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Heidi19657 May 2020 20:58So. We have now made our decision. We will install a heat pump and initially a small photovoltaic system with 5.1 kWp, but without a battery storage for the time being. Then we will monitor our heating and electricity consumption behavior for at least one year. After that, we may add a battery storage and possibly expand the photovoltaic system. This solution feels right for us.
The small poplar system will help you cover a portion of your electricity consumption during the summer (estimate: 40-60%). In winter, it will not come close to meeting your electricity needs (estimate: 20-30%), and it will hardly provide any benefit for the heat pump (estimate: less than 10%).
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