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.
S
Stadtvilla1922 Mar 2020 13:55No, we have everything—both the refrigerator and the large freezer are energy class A appliances. We also have a dishwasher that runs every two days, and the TV is always on in the evenings. Apart from an instantaneous water heater, we only have a gas boiler, which also consumes some electricity. In summer, the refrigerator and freezer work extra hard because we live in an attic apartment that can reach over 30°C (86°F) on some days.
At the moment, our consumption is increasing slightly since my wife is on parental leave, but here is the analysis from February 2018 to January 2019.
At the moment, our consumption is increasing slightly since my wife is on parental leave, but here is the analysis from February 2018 to January 2019.
G
Grantlhaua23 Mar 2020 06:50guckuck2 schrieb:
Have you calculated whether this is actually worthwhile? Self-consumption is definitely not free. Plus, you accept efficiency killers like large hot water storage and buffer tanks.I am actually quite satisfied with my consumption, despite the buffer tank. The question is, where exactly is it stated that the buffer tank is an efficiency killer? Of course, it has losses, but so does an electrical storage battery. When you search online, you only find forum posts but not a single proper article about it.
Stadtvilla19 schrieb:
3500 kWh in the apartment? What are you using? We currently have just under 1600 kWh with 2 adults and 2 children, and we cook every evening.... That’s actually quite low... as heavy users, we run the washing machine, dryer, and dishwasher.
Otherwise, just the small appliances like the coffee machine... TV (rarely on).
lin0r87 schrieb:
1kWp = €1345. If I did everything correctly.Is that gross or net?Similar topics