Hello
we are planning a new semi-detached house.
We want to install a photovoltaic system later on.
We will get the right half shown in the photo. Orientation is southwest.
The photovoltaic system will of course be installed on the southwest side facing the garden.
The black area is the 3x5 m (10x16 ft) terrace, which will later be covered with a fixed terrace roof measuring 4 m (13 ft) deep and 5.5 m (18 ft) wide.
My question is whether it will still be possible to install a photovoltaic system on the roof once the fixed terrace roof is there?
If the terrace roof is on the southwest side in the garden, it will no longer be possible to set up scaffolding.
For maintenance or in case of problems, access to the photovoltaic system will be necessary later on (is access without scaffolding not possible?)
Or can the photovoltaic system be installed without scaffolding?
The house will have a gable roof and 2.5 full stories.
we are planning a new semi-detached house.
We want to install a photovoltaic system later on.
We will get the right half shown in the photo. Orientation is southwest.
The photovoltaic system will of course be installed on the southwest side facing the garden.
The black area is the 3x5 m (10x16 ft) terrace, which will later be covered with a fixed terrace roof measuring 4 m (13 ft) deep and 5.5 m (18 ft) wide.
My question is whether it will still be possible to install a photovoltaic system on the roof once the fixed terrace roof is there?
If the terrace roof is on the southwest side in the garden, it will no longer be possible to set up scaffolding.
For maintenance or in case of problems, access to the photovoltaic system will be necessary later on (is access without scaffolding not possible?)
Or can the photovoltaic system be installed without scaffolding?
The house will have a gable roof and 2.5 full stories.
H
Hausbau 5515 Jan 2022 18:45Deliverer schrieb:
How much is that in €/kWh?400 Ah x 12.8 V = 5,120 Wh = 5.12 kWh ~1000 EUR / 5 kWh ~ 200 EUR/kWh
The profitability of a storage system can be easily calculated.
In my case, I would be able to use about 2000 kWh more that would otherwise be lost without storage. At a power purchase cost of 37 cents per kWh, this would result in annual savings of 740 euros. The storage system would then pay for itself after 7 years, assuming the electricity price does not increase further. With additional electricity price increases, the payback period would be shorter accordingly.
Aside from that, there is also a backup function available, providing emergency power supply in case of a blackout.
In my case, I would be able to use about 2000 kWh more that would otherwise be lost without storage. At a power purchase cost of 37 cents per kWh, this would result in annual savings of 740 euros. The storage system would then pay for itself after 7 years, assuming the electricity price does not increase further. With additional electricity price increases, the payback period would be shorter accordingly.
Aside from that, there is also a backup function available, providing emergency power supply in case of a blackout.
H
Hausbau 5516 Jan 2022 10:35Durran schrieb:
The profitability of an energy storage system can be easily calculated.
In my case, I could use about 2000 kWh more, which I would otherwise lose without storage. At a cost of 0.37 USD per kWh.
Here is a link where such scenarios can be nicely calculated. Statements like the 2000 kWh figure are meaningless without more information. You would need to provide your values such as total consumption, etc.
In our new house, we expect a total consumption of about 4,000 kWh, of which 2000–2200 kWh will be used for the heat pump. Where exactly would I be able to achieve the savings you mentioned with a storage system?
There are plenty of experts in the photovoltaic forum, and almost all of them advise against using storage from an economic standpoint.
It might be different if individual federal states offer subsidies for storage systems.
D
Deliverer16 Jan 2022 13:04@Durran, your calculation is missing the lost feed-in tariff, 20% storage losses, maintenance charging in winter, and (at least for most) VAT.
Besides, you need to manage pushing 5.5 kWh through the battery daily. With 7 kW on the roof, in my opinion, that’s not even remotely possible. I estimate a maximum of 3 kWh. With a heat pump and electric car, that leaves only one.
Besides, you need to manage pushing 5.5 kWh through the battery daily. With 7 kW on the roof, in my opinion, that’s not even remotely possible. I estimate a maximum of 3 kWh. With a heat pump and electric car, that leaves only one.
Nothing there is pointless. I can already tell you that 4000 kWh will not be enough for you. They assumed electricity prices with an annual increase of 6 percent, not 60 percent like many have experienced just this year. At prices above 40 cents per kWh, however, a storage system does become worthwhile.
So what happens now? Everyone is starting to add storage systems again. And very few understand my calculation.
With an electricity price of nearly 40 cents per kWh and an annual consumption of 5000 kWh, I pay 2000 euros per year for electricity. With a storage system, I have a self-sufficiency rate of 75 percent. This reduces my electricity purchase from the grid to only 25 percent, or effectively only 500 euros per year.
That leaves 1500 euros more in the household budget every year. Considering an investment of 11,000 euros, that’s not a bad return.
And whether I watch currency depreciation helplessly while my money sits uselessly in a non-interest-bearing account, or whether it is invested in my roof, ultimately makes no difference.
So what happens now? Everyone is starting to add storage systems again. And very few understand my calculation.
With an electricity price of nearly 40 cents per kWh and an annual consumption of 5000 kWh, I pay 2000 euros per year for electricity. With a storage system, I have a self-sufficiency rate of 75 percent. This reduces my electricity purchase from the grid to only 25 percent, or effectively only 500 euros per year.
That leaves 1500 euros more in the household budget every year. Considering an investment of 11,000 euros, that’s not a bad return.
And whether I watch currency depreciation helplessly while my money sits uselessly in a non-interest-bearing account, or whether it is invested in my roof, ultimately makes no difference.
D
Deliverer16 Jan 2022 13:11Durran schrieb:
Not 60 percent like many alone this year. You can make the numbers look better any way you want. Last year, electricity prices rose by about 1% on average. This year will be interesting; in the end, we will have to wait and see. For me, it was 3%.
But your last sentence is completely right: Better to have a roof fully covered than to worry about the bank account. And if you then have more than enough, you can always add something in the basement. But please do that only afterwards. Think of the children! ;-)
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