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.
Daniel-Sp schrieb:
My consumption:
150 sqm (1615 sq ft) without a basement, no electric car, air-to-water heat pump installed indoors, 4 people. Window ventilation. Building envelope meets KfW 40 standard, no controlled mechanical ventilation.
Moved in on 08/08/19.
Meter reading yesterday was 2619 kWh for everything.
You can see that electricity consumption is very individual. I don’t dispute that electricity consumption varies individually, but assuming a consumption of an apartment plus a 1000 kWh buffer to estimate usage for a detached house, semi-detached, or end-terrace house might be incorrect.
For example, in our previous apartment (ground floor), the annual electricity consumption was consistently around 2500 kWh without an electric car (about 3 years ago). Now, however, we have more continuous loads, which simply were not present in the apartment before.
Roger folks.
I will visit the forum.
150 m² (1600 sq ft)
KfW 55 standard
No electric car.
Working during the day
No basement
Of course, this needs to be assessed differently, but these are the values we have now.
I will visit the forum.
Zaba12 schrieb:
Whether it is sufficient cannot be answered without more detailed information, which you have not provided.
- House size?
- Basement yes or no?
- Electric car planned in the next few years?
- Main energy consumers?
- When are you at home?
- Your specific requirements for the system?
You can forget about the 4500 kWh per year with over 140 m² (1500 sq ft) of living space without a basement, especially if you already use 3500 kWh in an apartment.
150 m² (1600 sq ft)
KfW 55 standard
No electric car.
Working during the day
No basement
Of course, this needs to be assessed differently, but these are the values we have now.
G
Grantlhaua20 Mar 2020 06:38I have 19.4 kW installed on the roof, covering all four cardinal directions. Even on overcast winter days, I get 3-5 kW output, which should be enough during the day to power the heat pump and the house. The problem is only at night, but storage systems are definitely still too expensive.
@Grantlhaua have you ever considered raising the heat pump's supply temperature by 1 to 2 degrees and then only running it during the day?
It would be interesting to see how well that works, and it should be cost-effective since it would then run almost exclusively on solar power.
It would be interesting to see how well that works, and it should be cost-effective since it would then run almost exclusively on solar power.
G
Grantlhaua20 Mar 2020 09:37Specki schrieb:
@Grantlhaua Have you ever considered raising the heat pump’s supply temperature by 1 to 2 degrees and then running it only during the daytime?
It would be interesting to see how well that works, and it should be cost-effective if it’s mainly powered by photovoltaic electricity.Yeah, I’ll try that at some point too, but I just haven’t had time for experiments like that so far.
G
Grantlhaua20 Mar 2020 11:09@Specki
to get back to the topic again.
I specifically installed a 1000-liter (264-gallon) stratified buffer tank in my house, which I like to heat during the day and then use for heating at night. But as I said, I currently lack experience with it since I have many other projects ongoing...
to get back to the topic again.
I specifically installed a 1000-liter (264-gallon) stratified buffer tank in my house, which I like to heat during the day and then use for heating at night. But as I said, I currently lack experience with it since I have many other projects ongoing...
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