ᐅ Photovoltaic System: Costs and Savings Potential – Experiences?

Richooo schrieb:

Hi!
I keep reading that everything is unprofitable. But what about a new build, where the question is:
Gas heating + solar = €17,500 KfW subsidy
Or
Air-to-water heat pump + photovoltaic + storage = €37,500 KfW subsidy (with €27,500 additional costs in my offer)

So in the end, the total extra cost from KfW55 to KfW40 plus €7,500 more... is it profitable with storage then?

You need to consider which storage and photovoltaic system are used. Construction companies usually offer small solutions that meet KfW 40 standards. However, these tend to be unprofitable. If at all, I would:
a) install a photovoltaic system with at least 10 kWp (if the roof allows)
b) install storage only if there are subsidies or more financial benefits from KfW upgrades. These must also be properly matched to the photovoltaic system and storage.

Tom1978 schrieb:

You need to consider the type of battery storage and photovoltaic system. Construction companies usually offer small systems that lead to KfW 40 standard. However, this is generally not cost-effective. If I were to do it, I would:
a) Install a photovoltaic system with at least 10 kWp (if the roof allows)
b) Install battery storage only if there are subsidies or additional funding available through KfW improvements. The storage system must also be properly matched to the photovoltaic system.

I would need to calculate it first. The development plan allows a maximum of 50% of one roof side.
It’s a hip roof with a 45-degree pitch on a 140 m² (1,507 ft²) house.

I can definitely recommend the xxPVxx forum for this topic. You’ll find a lot of helpful information there. Make sure to educate yourself and avoid becoming a typical "storage victim," like 90% of current homeowners planning a photovoltaic system.

The basic rule is: optimize for the largest possible size, cover all sides and surfaces fully, don’t install a battery, and you're done. But as I said, you’ll get more information in the forums, where people are always happy to help and plan 🙂

exto1791 schrieb:

I can definitely recommend the xxPVxx forum for this. It’s very helpful. Make sure to gather information and avoid becoming the typical "battery sacrifice," like 90% of current homeowners planning a photovoltaic system.

Basically, the rule is: optimize as large as possible, cover all sides and surfaces completely, install without a battery, and you’re done. But as I said, you’ll find more information in the forums where people are always happy to help and plan 🙂

Thanks for the info!

As I said, the development plan allows only half of one roof side to be used. So, not much can fit there.

Richooo schrieb:

Thanks for the info!

As mentioned, the development plan only allows building on half of one roof side. So not much can fit up there.

Oh, so you’re only allowed to install the photovoltaic system on half of the roof? I thought from next year there would even be a requirement to install a photovoltaic system on every single-family house… That doesn’t seem to add up for me either 😀

What kind of beginner created the zoning plan...