A turnkey 10 kWp system typically costs CHF 20,000 to 27,000 in Switzerland before incentives. The one-off feed-in incentive of currently around CHF 3,600 and the tax deduction significantly reduce the net cost – often to under CHF 20,000. (Guideline values, as of: July 2026)
Key points in brief
- 10 kWp is the standard size for a single-family home with a heat pump or EV in mind.
- Space needed: roughly 45 to 55 m², so 22 to 24 modules of today's type.
- Annual production on the Swiss Plateau: roughly 9,000 to 10,500 kWh – more than most households consume.
- Calculated per kWp, the 10 kWp class is noticeably cheaper than small systems.
The example calculation
| Item | Guideline |
|---|---|
| 10 kWp system, turnkey (modules, inverter, installation, electrical work, scaffolding, registrations, VAT) | CHF 20,000–27,000 |
| One-off feed-in incentive (KLEIV, approx. CHF 360/kWp) | – approx. CHF 3,600 |
| Remaining investment before the tax deduction | approx. CHF 16,400–23,400 |
Guideline values, as of: July 2026. Pronovo's current rates and the individual quote are decisive. The tax deduction further reduces the effective cost – depending on income and municipality.
The CHF 7,000 spread between the lower and upper end is explained almost entirely by three factors: the roof (covering, steepness, accessibility), component choice (standard or premium), and the condition of the house's electrical system. What's behind this in detail is broken down in the full cost guide.
What does a 10 kWp system deliver over the year?
In the Swiss Plateau, roughly 900 to 1,050 kWh of annual yield per kWp is realistic – so for 10 kWp, around 9,000 to 10,500 kWh, depending on orientation, tilt and shading. This exceeds most households' consumption: a four-person household without a heat pump is often around 4,500 to 5,500 kWh, with a heat pump and EV quickly double that.
That's exactly why the question «what happens with the surplus?» is central at this system size. Two answers: feed it in (see feed-in tariffs) or deliberately increase self-consumption – with hot water, charge control or a battery (optimise self-consumption).
Why 10 kWp is so often the right size
When planning, we don't look at today's consumption but at the next 25 years. And a lot speaks in favour of a system this size:
- Heat pump: anyone replacing an oil or gas heating system in the coming years roughly doubles their electricity demand. The heating replacement guide shows the connections.
- EV: 10,000 km of driving means roughly 1,500 to 2,000 kWh of additional annual consumption.
- Cost logic: the fixed costs (scaffolding, electrical work, administration) are paid – every extra kWp is comparatively cheap.
Conversely: a roof that only allows 6 or 7 kWp is no disaster. What matters is using the available area sensibly, not hitting a round number.
Start with or without a battery?
At 10 kWp, substantial surplus arises on sunny days – so the battery question is a fair one to ask. Our short answer: the system works economically even without a battery, and retrofitting remains possible if the inverter is chosen with foresight (keyword: hybrid inverter). For those who want to see the numbers: What does a solar system with battery cost? and Is a battery storage system worth it?
The 10 kWp class is by far the most common in our projects in the Zurich region – and experience shows: what matters most for satisfaction is less the last decimal on the price than the planning of the electrical work. Where the meter box needs adjusting anyway, it's worth thinking ahead about capacity reserves for a wallbox and heat pump. This costs little within the project and saves a second building site later.
Frequently asked questions
How much roof area does 10 kWp need?
Around 45 to 55 m² with current 430–450 Wp modules – that's 22 to 24 modules. On east-west roofs, the layout is split across both sides.
What does the one-off feed-in incentive bring at 10 kWp?
Currently around CHF 3,600 (approx. CHF 360 per kWp, as of: July 2026). Pronovo's rates at the time of commissioning are decisive – details in the article One-off feed-in incentive.
Is 10 kWp enough for the house, a heat pump and an EV?
Calculated over the year, often yes – but production and consumption fall at different times (summer/winter, day/night). Part of the demand remains grid purchase; that's normal and accounted for in every sound calculation.
Is a bigger system automatically better?
Not automatically – but the extra cost per additional kWp is small as long as the roof area is well suited. We calculate variants side by side, then you decide with numbers instead of gut feeling.
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Your 10 kWp calculation – with real numbers
Roof, consumption, your municipality's tariffs: we put together the calculation for your situation. Free of charge and without obligation.
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Sources: Pronovo AG, EnergieSchweiz (sonnendach.ch), Swissolar, SFOE.
Last updated: 9 July 2026 · Author: ecoEn editorial team
