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.
Specki schrieb:
Here is my system from today. 24.48 kWp east/west. Best day of the year so far.
Unfortunately, the solar installer hasn’t managed to include my consumption data on the data logger yet.I just had 59.4 kWh with 8.68 kWp. Self-consumption was 43% and 100% energy independence. You have a nice system there.
Thank you. I followed the motto in this other forum: roof fully covered, no battery storage.
I would have gone for significantly more if I hadn’t had to reasonably skip a few panels because of the two chimneys.
I can’t achieve 100% energy self-sufficiency. It has been connected to the grid since mid-March. But I think we are currently at about 70% self-sufficiency. That’s the advantage of the large east/west system. The self-sufficiency rate is really good even without battery storage.
If there were a tow hitch available for my preferred electric car, I probably would have got one soon. The incentives are very attractive. The car is technically really good for me. But unfortunately, without a tow hitch, it’s not feasible. That really annoys me... but there’s nothing you can do about it.
I would have gone for significantly more if I hadn’t had to reasonably skip a few panels because of the two chimneys.
I can’t achieve 100% energy self-sufficiency. It has been connected to the grid since mid-March. But I think we are currently at about 70% self-sufficiency. That’s the advantage of the large east/west system. The self-sufficiency rate is really good even without battery storage.
If there were a tow hitch available for my preferred electric car, I probably would have got one soon. The incentives are very attractive. The car is technically really good for me. But unfortunately, without a tow hitch, it’s not feasible. That really annoys me... but there’s nothing you can do about it.
What did you do with 0.43*59.4 kWh? I don't use that much in 3 days... An electric car?
Zaba12 schrieb:
For me, it was exactly 59.4 kWh at 8.68 kWp. Self-consumption 43% and 100% self-sufficiency.
You have a nice system there .
Tego12 schrieb:
What did you do with 0.43*59.4 kWh? I don’t consume that much in 3 days… Electric car? Yes
@Specki: I would have liked to do that too, but covering a purely north-facing side with the satellite dish on it didn’t seem worthwhile to me given the efficiency and the same price per module.
70% seems quite high without a battery storage system.
Zaba12 schrieb:
YesI need that too, but unfortunately also a towing capacity of at least 1800 kg (about 4000 lbs) because of horses.... :/
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