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.
miho schrieb:
Well, you could also consider a Tesla Model 3. Definitely not.
I think Tesla is great, no question about that. But it’s a car for people who have enough money or really want it.
I need a car that is affordable and meets my criteria. The Tesla is far, far above that.
Specki schrieb:
I can check tomorrow, but I think we might even be above that. Glad to hear it. What will be interesting is the level of self-sufficiency averaged over 12 months and the self-consumption rate. My solar technician only installed the energy meter three days ago, so now I can monitor consumption live. I hadn’t realized that we consume between 12–15 kWh (14–18 kWh) and 25 kWh (28 kWh) per day. I find that quite high already outside the heating season—12–15 kWh (14–18 kWh) per day without charging the electric vehicle. That’s not something you’re aware of without photovoltaics and monitoring. For example, the hairdryer uses 2 kWh (2.4 kWh), the stove 2.5 kWh (3 kWh), the oven 4.5 kWh (5.4 kWh), TV 150 Wh (170 Wh), hot water 3 kWh (3.6 kWh), and so on.
That’s why I’m now even more of an advocate for photovoltaic systems. Storage isn’t strictly necessary unless you don’t know where else to invest the money.
H
hampshire8 May 2020 11:06The trailer discussion is one-dimensional. Many households have two cars. One is an electric vehicle that drives most trips efficiently, while the other tows the trailer when needed.
Electric cars are also cheaper to operate if the electricity is not sourced from rooftop solar panels. At 15 kWh per 100 km, and a price of 30 cents per kWh, the cost is just about €4.50 (about $4.50), plus savings on consumables, wear parts (especially brakes), and maintenance costs.
Electric cars are also cheaper to operate if the electricity is not sourced from rooftop solar panels. At 15 kWh per 100 km, and a price of 30 cents per kWh, the cost is just about €4.50 (about $4.50), plus savings on consumables, wear parts (especially brakes), and maintenance costs.
hampshire schrieb:
The trailer discussion is one-sided. Many households have two cars. One drives most trips efficiently on electric power, while the other is used to tow a trailer when needed.
Electric cars are also cheaper to operate if you don’t use solar power from the roof. At 15 kWh per 100 km (62 miles) and 30 cents per kWh, the cost is just €4.50, plus you save on consumables, wear parts (especially brakes), and inspection costs.We use exactly the same setup. The person who drives the longest distance that day takes the electric car (usually me). Anything over 120 km (75 miles) or when extra storage space is needed, we use the gasoline car.For towing, the Outlander as a hybrid would be a solution. Fully electric doesn’t make sense if you only have one vehicle.
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