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.
D
Deliverer15 Sep 2021 19:04driver55 schrieb:
If you want storage, make sure I can be mostly self-sufficient in winter too – otherwise it’s pointless for me.Sure, you can buy that. Quick calculation: A heat pump needs about 2 kW when it’s cold. Multiply by 16 hours of darkness = 32 kWh. To recharge that reasonably in winter, you need roughly 100–150 kWp solar panels on the roof.It’s possible if you have, in addition to the house, a very large outbuilding or shed. If not, it’s not doable.
halmi schrieb:
The main problem is that the storage tank simply can’t be emptied overnight from April to October.That can be solved. In winter, I heat water during the day, in summer at night.halmi schrieb:
But in summer, by 7:30 AM, it’s already recharged again.It would be smarter not to recharge the tank in the morning, but around midday. This way, you can effectively counteract the 70% regulation and use free electricity that otherwise would not have been generated.halmi schrieb:
You simply don’t manage the cycles needed to become at least somewhat cost-effective.This is not a sprint. If anything, the battery will last longer. Or the battery is too large / the photovoltaic system is too small. You always assume in the calculations that the battery has to be discarded after a certain number of cycles. Usually, only the storable capacity is reduced. Furthermore, many manufacturers now offer a 10-year warranty on the battery, and you are willing to scrap it after 10 years...
D
Deliverer15 Sep 2021 20:03You need to read these warranties very carefully. Recently, this became apparent with one of the major companies:
The warranty covers materials only. Labor and travel costs are charged separately. Some customers have already used the "warranty service" three times within two years, each time costing 500 euros.
The same manufacturer excludes the warranty if the electrical system is not checked "regularly" or if there are power outages. Quite a convenient clause.
So, make sure to read the fine print!
Ah, edit: When doing cost-effectiveness calculations, always calculate photovoltaic systems and photovoltaic systems with storage separately. The photovoltaic system usually covers the otherwise unprofitable storage system. That’s nice, but otherwise, you would have had the money in cash... Also, please factor in and add the 20% storage losses when calculating feed-in tariffs. (Yes, it’s 20%. For everyone who has done the math.)
The warranty covers materials only. Labor and travel costs are charged separately. Some customers have already used the "warranty service" three times within two years, each time costing 500 euros.
The same manufacturer excludes the warranty if the electrical system is not checked "regularly" or if there are power outages. Quite a convenient clause.
So, make sure to read the fine print!
Ah, edit: When doing cost-effectiveness calculations, always calculate photovoltaic systems and photovoltaic systems with storage separately. The photovoltaic system usually covers the otherwise unprofitable storage system. That’s nice, but otherwise, you would have had the money in cash... Also, please factor in and add the 20% storage losses when calculating feed-in tariffs. (Yes, it’s 20%. For everyone who has done the math.)
Deliverer schrieb:
Ah, you can just buy that. Quick calculation: A heat pump needs about 2 kW when it’s cold. Times 16 hours of darkness equals 32 kWh.I don’t have 350 sqm (3,767 sq ft). 😎 12 kWh is enough…
Deliverer schrieb:
To fill them reasonably well in winter, you need about 100 - 150 kWp of solar panels on the roof.
It’s possible. If you have a very large shed in addition to the house. If not, it’s not doable.Space is (initially) secondary; the main concern is the cost.D
Deliverer15 Sep 2021 22:47They don’t really matter for photovoltaics (currently), since you get more than your full investment back through the Renewable Energy Act.
driver55 schrieb:Actually, I took values from an older building. In a new build, the heat pump might only account for about a quarter of that. Still, when it comes to photovoltaics, bigger is usually better— and sorry, no offense, but 12 kWp is rather small. As soon as it rains, you’re left with barely around 1 kW. What do you expect to power with that?
I don’t have 350 sqm. 😎
12 kWh is enough…
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