ᐅ Photovoltaic System: How Many kWp Are Sufficient for a House?
Created on: 19 Mar 2020 09:10
L
lin0r87
Hello everyone!
We are building a semi-detached house and want to install a photovoltaic system on the roof. The orientation would be south/west and north/east. We intend to use most of the electricity ourselves. A battery is not planned, as the cost is quite high for such a system and it probably doesn’t make financial sense.
We have received an offer that includes:
- 14x IBC MonoSol 360 (there is still space on the north/east side... does that make sense?)
- SMA SB 3.6-1AV-40 inverter
- DEHNcube YPV SCI 2MPP surge protection device
- Meter cabinet (+ accessories)
- Installation
The price is about 7,500€ gross.
The system will have a capacity of 5.04 kWp.
Currently, there are three people living in the house (2 adults, 1 child). Four are planned.
Our roof is quite simple but well oriented.
We are wondering if 5.04 kWp is sufficient?
Our electricity consumption in the apartment was always below 3,500 kWh per year, but we expect it to increase with the house. We estimate about 4,500 kWh.
Regarding the 24/7 electrical loads:
There will be an air-to-water heat pump from Novelan and a ventilation system with heat recovery.
I would really appreciate some advice.
We are building a semi-detached house and want to install a photovoltaic system on the roof. The orientation would be south/west and north/east. We intend to use most of the electricity ourselves. A battery is not planned, as the cost is quite high for such a system and it probably doesn’t make financial sense.
We have received an offer that includes:
- 14x IBC MonoSol 360 (there is still space on the north/east side... does that make sense?)
- SMA SB 3.6-1AV-40 inverter
- DEHNcube YPV SCI 2MPP surge protection device
- Meter cabinet (+ accessories)
- Installation
The price is about 7,500€ gross.
The system will have a capacity of 5.04 kWp.
Currently, there are three people living in the house (2 adults, 1 child). Four are planned.
Our roof is quite simple but well oriented.
We are wondering if 5.04 kWp is sufficient?
Our electricity consumption in the apartment was always below 3,500 kWh per year, but we expect it to increase with the house. We estimate about 4,500 kWh.
Regarding the 24/7 electrical loads:
There will be an air-to-water heat pump from Novelan and a ventilation system with heat recovery.
I would really appreciate some advice.
H
hampshire20 Mar 2020 11:39The initial question is similar to asking, "How much horsepower is enough for a vehicle?"
If you consider the system as a financial investment, you can currently build as large as possible—bearing in mind that the payment conditions change at 10 kWp, causing a small "jump" in the calculation.
If you view the system as a sustainability investment, you can size it so that it produces more energy in total than you consume.
If you see the system as a self-sufficiency tool, you will approach the calculations differently to determine what is "sufficient."
If you consider the system as a financial investment, you can currently build as large as possible—bearing in mind that the payment conditions change at 10 kWp, causing a small "jump" in the calculation.
If you view the system as a sustainability investment, you can size it so that it produces more energy in total than you consume.
If you see the system as a self-sufficiency tool, you will approach the calculations differently to determine what is "sufficient."
Yes, if a buffer tank is involved, then I'm not sure if it might actually result in a negative outcome.
I would have raised the supply temperature by 1 to 2°C (about 2 to 4°F) and used the screed as a buffer. But adding an extra buffer causes even more efficiency losses and the investment cost has to be recovered first... so is it still worth it?
I would have raised the supply temperature by 1 to 2°C (about 2 to 4°F) and used the screed as a buffer. But adding an extra buffer causes even more efficiency losses and the investment cost has to be recovered first... so is it still worth it?
We have 7.5 kWp on the roof, plus a 7.7 kW storage system. The heat pump heats the house during the day when there is surplus electricity (using the screed as a buffer) and also heats the domestic hot water to a higher temperature. The storage lasts until the next morning.
Everyone has a different opinion: go full capacity; install up to 9.9 kWp; install without storage; and so on...
Everyone has a different opinion: go full capacity; install up to 9.9 kWp; install without storage; and so on...
blackm88 schrieb:
We have 7.5 kWp on the roof, plus a 7.7 kW battery storage. The heat pump heats the house during the day when there is surplus electricity (using the screed as a buffer) and raises the hot water temperature. The storage usually lasts until the next morning.
Everyone has a different opinion: install as much as possible; keep it up to 9.9 kWp; go without storage; and so on...We have an offer for 19 modules at 360 W each.
More probably wouldn’t fit.
S
Stadtvilla1922 Mar 2020 11:173500 kW in the apartment? What are you all doing? We currently use just under 1600 kW with 2 adults and 2 children, and we also cook dinner every evening...
Similar topics