There's no universally valid payback period. Depending on consumption, roof, electricity price and tariff developments, it typically sits in a range of around ten to fifteen years for single-family home systems – with a system lifetime of 25 to 30 years. Four variables are decisive: the investment after incentives, the self-consumption share, your electricity price, and the feed-in tariff. (As of: July 2026)
Key points in brief
- The calculation is simple: investment divided by the annual benefit from saved electricity purchases and feed-in remuneration.
- Self-consumption is the biggest lever – self-consumed solar power is worth roughly two to four times as much as fed-in power.
- The one-off feed-in incentive and the tax deduction lower the investment and shorten the calculation from the start.
- Anyone who gives you an exact payback period without looking at your roof and consumption is dressing up the numbers.
- After payback, the system delivers electricity for many more years whose costs are essentially paid off.
How is a payback period even calculated?
Behind the clunky word lies a simple question: after how many years has the system earned back its own costs? That takes two figures. First, the investment – the system price minus incentives and the tax effect. Second, the annual benefit, and that consists of two cash flows: the electricity you no longer have to buy from the utility, and the remuneration for the fed-in surplus.
A deliberately simplified example calculation, not a forecast: a 10 kWp system costs, after deducting the one-off feed-in incentive, in the order of CHF 20,000. If it produces around 10,000 kWh a year and part of it is self-consumed, the rest fed in, an annual benefit of roughly CHF 1,500 to 2,000 results, depending on the tariff area. Divided, that gives a payback range that matches the guideline value mentioned at the start. Shift a single input figure – more self-consumption, a more expensive utility area, a lower feed-in tariff – and the result moves by years.
That's exactly why the payback period isn't a property of the system, but the result of your situation. The four variables in detail.
Factor 1: the investment – and what lowers it immediately
The starting point of the calculation is the price of the turnkey system. The guideline values for this are in the cost overview Switzerland: currently CHF 2,000 to 2,800 per kWp for single-family home systems, small systems above that, large ones below. A lot is already decided here: because fixed costs like scaffolding and electrical work are spread over more output, a well-sized, rather larger system has the better starting value per kilowatt.
You're allowed to deduct two items from that. The federal one-off feed-in incentive currently covers around CHF 360 per kWp for small systems (as of: July 2026, Pronovo's current rates are authoritative). On top of that, in most cantons there's the tax deduction for maintenance costs, which has a noticeable effect depending on income and canton. Both shorten the payback before the system has produced its first kilowatt-hour.
Factor 2: self-consumption – the biggest lever
If you remember only one figure from this article: every kilowatt-hour you consume yourself saves you the full grid purchase price of typically 25 to 35 Rp., while feed-in brings only 6 to 14 Rp. depending on the utility. Self-consumed solar power is therefore worth roughly two to four times as much as fed-in power. Two houses with an identical system and identical annual consumption can therefore have completely different payback times – just because in one somebody is home during the day, a heat pump is running, or an electric car charges at midday.
Self-consumption is also the only factor you can still actively improve after construction. Shifting consumers into the sunlight hours, controlling the water heater and heat pump, charging the electric car with surplus – the levers at a glance. You can't turn the dial on the electricity price and feed-in tariff; on your consumption profile, you can.
Factor 3: electricity price and feed-in tariff – the two unknowns
Both figures change every year, and nobody knows either of them for the next 25 years – not us either. Only the mechanics are certain: if your electricity price rises, every self-consumed kilowatt-hour becomes more valuable and the payback shorter. If the feed-in tariff falls, the surplus loses value and the calculation gets longer. The past shows considerable fluctuations in feed-in tariffs – anyone who builds their profitability solely on a high feed-in tariff is building on sand.
This leads to a planning rule we repeat in every consultation: calculate the system so that it works through self-consumption, and treat feed-in as a bonus. Then your utility's tariff decisions can shift the calculation, but not overturn it.
Factor 4: yield, operating costs and lifetime
Your roof's yield sets the frame: in Switzerland, around 950 to 1,100 kWh per kWp per year is a common guideline value, depending on orientation and location. Heavy shading pushes this value down – and lengthens the payback more directly than any other property of the house.
On the cost side, little happens, but not nothing: meter rental, possibly an insurance surcharge, and the reserve for the inverter, which is typically replaced once during the system's lifetime. These items belong in an honest calculation – they shift the result by months, not years. What adds up here is shown in the cost overview for the single-family home.
And the flip side of payback: modules last 25 to 30 years and more. Even at the upper end of the payback range, a good decade remains afterward in which the system delivers practically paid-off electricity.
How strongly does each factor act?
| Factor | Effect on payback | Can you influence it? |
|---|---|---|
| Investment per kWp | direct – lower starting value, shorter calculation | yes, via size, component choice and comparing quotes |
| Incentives & tax deduction | lowers the investment immediately | partially – submit applications correctly and on time |
| Self-consumption share | the biggest lever in operation | yes, via consumption behaviour and control |
| Utility's electricity price | higher price = shorter payback | no – only by moving to another municipality |
| Feed-in tariff | affects the surplus | hardly – model choice and the GO bring something |
| Roof yield & shading | sets the frame for production | yes during planning, hardly afterward |
Qualitative overview, as of: July 2026. The individual calculation based on your roof and consumption is binding.
We say one consequence of this table openly: if a provider promises you an exact-to-the-year payback in the first conversation, they've replaced at least three of these rows with assumptions they can't know. A reputable quote states ranges and discloses the assumptions – anything else belongs among the warning signs with solar providers.
The most common question in a consultation is about payback – and our answer disappoints at first, because it's a question back: who's home during the day, what heats the house, what's parked in the garage? In our projects in the region we regularly see two almost identical roofs with years of difference in the calculation, just because of the consumption profile. And one more observation from many quote comparisons: the most exact payback figure in the sales brochure is rarely the most honest one.
Frequently asked questions
Does a battery storage system shorten the payback?
Usually not – it raises self-consumption, but also the investment, and the additional saving doesn't fully recover the extra cost in many single-family homes. Whether a storage battery pays off is a separate consideration with its own criteria: Is a battery storage system worthwhile?
How much does the incentive shorten the payback?
For small systems, the one-off feed-in incentive currently covers a notable part of the investment (guideline value around CHF 360 per kWp, as of: July 2026), plus the cantonal tax deduction. Together they typically shorten the calculation by several years – Pronovo's or your canton's current rates are authoritative.
What is the energy payback?
A different concept: it describes when a module has earned back the energy of its own production – that takes considerably less time than the financial payback. You'll find the assessment in the article on the embodied energy of solar modules.
Should I wait for prices to fall further?
Component prices tend to fall, the craft share tied to Swiss wages hardly does. Anyone waiting for significantly lower total prices loses years of production in the meantime – and it's exactly those years that are missing from the calculation in the end.
What happens after payback?
The system keeps running, only now the yield belongs entirely to you: with a lifetime of 25 to 30 years, many years remain after a typical payback phase in which only small operating costs still arise. This second phase is the real reason why solar systems pay off.
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What does that mean for your roof?
Ranges are statistics – your payback depends on your consumption, your tariff area and your roof. We calculate it for you transparently, with disclosed assumptions and no window-dressing.
Want to calculate yourself first? Solar calculator with official roof data →
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Swissolar-certified specialist company · ESTI installation authorisation (Art. 14 NIV) · in Zurich since 2017 · over 150 systems completed · a personal answer from the specialist company, no call centre
Sources: Pronovo AG (current EIV rates), Swiss Federal Office of Energy SFOE, ElCom (electricity price overviews), Swissolar.
Last updated: 9 July 2026 · Author: ecoEn editorial team
