Zuid-Holland · since 2014
Rooftop solar for houses and small commercial roofs. One crew from survey to switch-on, and ten years of output monitoring included in the price.
Free, takes 40 minutes, no obligation to buy.
312
roofs finished in Zuid-Holland
6.8 yr
median payback at current tariffs
4 wks
survey to switch-on, typical
Fleet output, right now
1,284kW
312 roofs reporting · updated 40 s ago
We measure the roof, check the rafters and the meter cupboard, and photograph everything.
40 minutes · free
A fixed price with the panel model named. We file the grid connection on your behalf.
Week 2 · nothing to sign yet
Two days on the roof, one hour in the meter cupboard, and the monitoring app before we leave.
Week 4 · one crew, start to finish
Rotterdam irradiance, 445 W panels, July 2026 tariffs
6.2 kWp, one string
per year, measured average
installed, 0% VAT
at current tariffs
The common Rotterdam roof. One pitch, one string, one day on the roof. The chimney costs you about two panels and we say which two at the survey.
9.8 kWp, two strings
flatter curve across the day
installed, 0% VAT
at current tariffs
East and west beats south for self-use. Ten per cent less on paper, and more of it lands at breakfast and dinner, which is when you are actually home.
48 kWp, ballasted
per year, 500 W panels
excluding VAT
with the EIA deduction filed
The roof has to take 18 kg per square metre. We check that before we quote, and if a structural engineer has to look at it, that is €450 and it is theirs, not ours.
A quote nobody can compare is not a quote.
Ours names the panel, the inverter, the number of panels and the price per installed kilowatt-peak. If a competitor will not, that is the answer to the question you were about to ask them.
The monitoring app, included, no subscription
Today · Delfshaven, 6.2 kWp
The pale band is what the survey predicted for a clear July day. The line is what your roof actually did.
This month
+4% vs estimate
612 kWh against a predicted 588. Reported either way; three of our roofs are running under and they can see that too.
If a string drops
A panel string that stops reporting raises a ticket with us the same hour. Nine times in ten it is the inverter wifi.
Warranty
Two claims since 2014, both settled by us with the manufacturer. You never spoke to them.
What we fit
Aerion SolarEdge Enphase Van der Valk EsdecPrices include mounting, inverter and switch-on
A quote that says “high-efficiency panels” is a quote you cannot compare. Ours names the model, the wattage and the warranty, and the price per installed kilowatt-peak is on the same line.
Output measured against the survey estimate
South-west, 28° tiled · 14 panels · switched on 4 June
East and west, 35° tiled · 22 panels · switched on 21 May
Flat, ballasted at 10° · 96 panels · switched on 12 April
Figures for a 9.8 kWp house install, July 2026
€9,340
Paid on switch-on, not before. The VAT on a house install is 0% in the Netherlands, so the price you see is the price you pay.
Payback 6.8 years at current tariffs
€96 / month
Ten years at 4.1% through a green loan. The monthly repayment is usually under what the panels take off the bill from month one.
We do not arrange it and take no commission
€214 / month
For commercial roofs. Fully deductible, and the EIA scheme covers 40% of the investment in the first year if you file it.
Minimum 20 kWp · five-year term
Said before the survey, not after
Four jobs we say no to. Every one of them is a job somebody else in this city will quote for, and every one of them ends with a roof that does not pay for itself.
Under 20° we will look. Above that the yield does not carry the scaffolding.
Panels outlive tiles. Re-roof first, then call us; taking them down and back up costs more than waiting.
At Dutch tariffs a home battery does not pay back inside its warranty. We will say so again next year.
We work Zuid-Holland only. One crew, ours, and they sleep at home.