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What decides a restaurant's solar payback isn't the roof and isn't the number of panels — it's which hours of your trading day the panels actually earn you anything, and which hours they simply produce into the void. An installer's quote is always built the same way: panel count × average sun exposure × today's electricity price. What that arithmetic never shows is that almost every European feed-in rate has fallen far below what you yourself pay for electricity from the grid. So what decides the euro value of a solar panel isn't what it produces — it's what your kitchen actually uses while it is producing.
A lunch-driven restaurant captures the midday solar peak directly in its own kitchen. A dinner-only concept sees its own peak load — the extraction hood, the combi-ovens, the walk-in recovering after every door open — arrive hours after the panels have all but stopped producing. Same roof, same panel count, same quote, a completely different payback.
Why a restaurant doesn't run the numbers like a shop or an office
Solar calculators are built for the average business, and the average business is a shop or an office: open 09:00–18:00, with a load spread fairly flat across the day that falls squarely inside the solar window. For that profile, "more panels" is almost always "more saving", because nearly every kilowatt-hour produced gets absorbed within the same hours.
A restaurant doesn't have a flat load — it has two peaks and a floor. The floor is refrigeration running 24 hours a day: walk-ins, freezers, drinks coolers. Studies of commercial-kitchen electricity use commonly place refrigeration anywhere from around a fifth to nearly half of total kitchen electricity, depending on whether the study measures kitchen equipment alone or the whole building — in every case, the single largest always-on component. That floor catches the sun equally well whatever your service style is: refrigeration doesn't care what time it is.
The two peaks are a different story. The lunch peak — roughly 12:00 to 14:30 — sits squarely inside the window where most European solar installations hit their highest output. The dinner peak — roughly 18:00 to 22:00 — starts as production is already tailing off, and in late autumn and winter runs mostly after the sun has set. That difference, and nothing else on the roof, is what pulls the payback of an otherwise-identical lunch restaurant and dinner restaurant apart.
Here's what that looks like per service style — then you can run it against your own numbers below.
Production curve vs. kitchen load, by service style
Illustrative day shape — the gold curve is solar production, each line beneath it is kitchen load for that service style
A lunch concept sits mostly under the production curve; a dinner concept sits mostly beside it
One trading day, three windows
1. The kitchen wakes up as the sun warms up
Morning prep — 08:00 to 11:00
The panels come to life slowly around 07:00–08:00, right as the first shift walks into the kitchen: stocks going on, vegetables being cut, the oven pre-heating for lunch service. The overlap is still modest — production is only at about a third of its peak — but the shape already matches: both are climbing at the same pace. This window doesn't need its own line item in your planning; it's the warm-up for the window that actually matters.
2. The best euros your system will ever earn
Midday peak — 12:00 to 14:30
This is the window where both curves peak at the same time. The panels deliver their highest output of the day, and a lunch concept hits its own peak at exactly that moment: the oven full, the extraction hood running flat out, twenty plates under the pass at once. Every kilowatt-hour produced here is consumed within minutes — no grid, no export, no rate lower than what you'd otherwise pay. For a lunch or all-day concept, this window carries the whole business case: miss it, and you miss the rest of the story too.
3. The window that actually decides a dinner concept's payback
Dinner service — 18:00 to 22:00
In summer this window still falls partly inside late-afternoon production; in autumn and winter the sun has long set and the panels produce nothing at all. And this is exactly where a dinner concept's own peak lands: the extraction hood at full tilt, the combi-ovens running continuously, the walk-in recovering from every open door into a warm kitchen. For a purely dinner-driven restaurant, this window decides whether the installation pays back in eight years or fifteen — not the roof, not the panel count, this window.
Self-consuming always beats exporting
Every kilowatt-hour you use yourself saves you the full retail price. What you export is paid at a fraction of that — and the fraction keeps shrinking
Four illustrations, dated 2026 — ask your own grid operator or supplier for the current rate, because these figures move fast and vary by contract:
Netherlands (from 2027)
Net metering (salderingsregeling) stops all at once on 1 January 2027 — no phase-out, no transition years. Suppliers must pay at least half of their bare delivery tariff, which in practice is often far less than half of what you actually pay on your bill.
Germany
The EEG rate for small rooftops (up to 10 kWp) has been stepping down every six months since 2024 — whatever applies today won't apply in a year.
France
One of the few EU markets with a comparatively favourable regulated feed-in tariff — check your own contract for the current figure.
Flanders (Belgium)
Since the switch to the digital meter there is no government-guaranteed compensation left. What you get depends entirely on your energy supplier — in practice often a few cents per kWh at wholesale level, or nothing.
In every one of the four markets, using it yourself beats selling it back — the only question is how wide the gap is
Calculate your own self-consumption and payback
Nothing above is a promise about your own restaurant — those are illustrations of the shape. What is predictable is the arithmetic: enter your own service style, system size, investment and electricity prices, and you get an estimated self-consumption share and an estimated payback period. The calculator assumes an average annual yield of 950 kWh per kWp — a reasonable middle figure for north-western and central Europe; your own installer will price in your roof's real orientation, tilt and local irradiance, so treat this as a starting point, not a final answer.
Self-consumption & payback calculator
Illustrative, based on your own numbers — not a quote, not a promise
Estimated self-consumption
52%
Estimated saving per year
€3.309
Simple payback
7,3 years
How this figure is built
- Estimated annual production
- 19.000 kWh
- Self-consumed (at full price)
- 9.859 kWh
- Exported (at export price)
- 9.141 kWh
Change only the service style with every other number held constant, and the gap in self-consumption between "lunch only" and "dinner only" quickly runs to 40–50 percentage points — with not a single panel added or removed. That's the leverage this whole page is about, and it's exactly the conversation to have with your installer before you sign: not "how many panels fit on my roof", but "how much of that production does my kitchen actually absorb, given when I'm open".
What decides the rest of your payback
Subsidies and tax support
Most EU member states treat a restaurant differently from a private home for tax purposes — sometimes more favourably (investment deductions, accelerated depreciation), sometimes not eligible for a scheme built purely for households. Subsidy schemes also change constantly and vary sharply by region, province and municipality. Ask your installer or accountant explicitly before you calculate anything, and never bake a subsidy into your own numbers before you have it confirmed in writing — a scheme that exists today can already be different by the time works start. Our guide to subsidies for your business explains how to track these schemes down systematically.
Panel degradation: plan for less than year-one output
Solar panels produce gradually less over time — the industry generally cites around 0.5% output loss per year as a rule of thumb. Over 25 years, that means a panel starting at 100% still delivers roughly 88% of its original output. For your payback period this makes little difference — production stays close to intact through the first eight to ten years most installations take to pay themselves back — but for a 20–25 year lifetime projection, that decline belongs in the sum.
Orientation and shading from a taller neighbour
A flat, unobstructed, south-facing roof is the ideal case, and that ideal case is rare in a city centre. A taller neighbouring building, a chimney, a billboard, or simply an east-west orientation instead of south, can shift the output of the exact same panel count by tens of percent. Always ask your installer for an hourly production forecast for your specific roof — an annual total hides precisely the shape of the curve this whole page is about.
When it honestly doesn't pay off
A small dinner-only concept on a three-to-five-year lease, with limited own roof area and an installation that only breaks even after eight to ten years, is the case where solar panels often don't pay off — not because the technology fails, but because the horizon is too short to carry the investment. An owner-operator with a long lease or their own building, or a lunch- and all-day concept with a strong midday peak, sits on the other side of that same sum. Know your own horizon before you sign anything.
Your action plan for the conversation with your installer
You don't need to work all of this out at once. Four steps, in this order:
- Ask for an hourly production forecast, not an annual total. A quote with only a yearly figure hides exactly the shape of the curve this page is about. Ask explicitly for expected output per hour on a typical summer day and a typical winter day.
- Get your own hourly consumption profile from your energy supplier. Your digital meter already records this — ask for the interval data instead of an estimated annual total, and lay it next to the production forecast from step 1.
- Run your self-consumption and payback through the calculator above, with your own service style, system size and current electricity prices — not the default values.
- Price a battery only after this exercise, never before it. Once you know how much solar energy you already self-consume without one, you know exactly how much a battery would still need to deliver to pay for itself.
Bottom line: the roof doesn't decide it, your opening hours do
Two identical quotes on two identical roofs can land years apart on payback, and the difference is never on the roof. It's in the answer to one question: how much of that production does your kitchen actually use, at the moment it's generated? For a lunch or all-day concept, that answer is usually favourable. For a dinner concept, it depends on your refrigeration floor, your lease horizon and whatever export compensation your country still offers — and that last one keeps shrinking almost everywhere.
At HappyChef it's all about visibility into your own numbers, whether that's covers or energy: a commission-free reservation system that shows you exactly when your restaurant fills up — and therefore when your kitchen draws the hardest. Read our guide to cutting energy costs or try HappyChef free for 30 days.