Net profit over 25 years₪339,040
- Income a year
- ₪17,280
- Installation
- ₪68,727
- Payback
- 4.0
- Tariff
- ₪0.48 per kWh
Solar calculator · free
What can your roof earn?Transparent maths, in ten seconds.
Pick the property type, the area and the region. The numbers update as you go, and every factor behind them is listed below.
- No sign-up
- Buy or lease
- 25-year outlook
Your roof
Property
Usable roof areaThe area panels can cover, without parapets or equipment
Region
Roof type
Facing
Shading
Live estimateBuy
Income in year one₪17,280about ₪1,440 a month
System21.8 kWp
Panels33
kWh a year36,000
Payback4.0 years
Pays for itself in year 5
A first estimate from factors typical for Israel. Not a quote.
Buy or lease
Two ways to earn from the same roof
Buy, and you invest and keep all the income. Lease, and another company builds and maintains the system while you're paid for the roof without spending a shekel.
Usually for large roofs: needs 1,000 m² or more
What it does for the air
Clean power, in numbers
18.0 tless CO₂ a year
900trees it would take to absorb the same each year
424.8 tless CO₂ over the term
850 MWhclean power over the term
Next step
Want exact numbers for your roof?
Leave your number and we'll come back with a real design. Free, no commitment.
- 1We call and ask a few questions
- 2We design on your actual roof, from the address
- 3You get a quote with figures and a payback schedule
Beyond the estimate
The calculator estimates. 3D measures.
The calculator works from the area and facing you enter. Instant 3D builds the roof itself from the address: every plane, every pitch and every shadow, and a panel layout an installer approves.
- The real area and pitch of every roof plane
- Shade from trees, water heaters and nearby buildings
- Panels laid out on the roof, not on an average
No black box
The numbers behind the maths
These are the factors the calculator is using right now, as they're set in the system. You can check any result by hand.
- Roof area
- ÷ area per kWp
- System (kWp)
- × regional yield × facing × shade
- Yearly output
- × tariff
- Income
Yearly yield per kWp
- North
- 1,700 kWh
- Centre
- 1,650 kWh
- South
- 1,825 kWh
- Arava
- 1,895 kWh
Tariff per kWh
- Home
- ₪0.48
- Commercial
- ₪0.37
- Municipal
- ₪0.54
- Lease
- ₪0.1367
Installation per kWp
- Home
- ₪3,150
- Commercial
- ₪2,200
Roof area per kWp
- Tiled
- 5.5 m²
- Flat
- 6.5 m²
- Mixed
- 5.7 m²
Facing and shade factors
- Diagonal facing
- ×0.98
- East / west
- ×0.86
- Some shade
- ×0.96
- Heavy shade
- ×0.80
Over time
- Degradation, year one
- 1.0%
- Degradation, each year after
- 0.4%
- Term
- 25
- Panel rating
- 665 W
Commercial and municipal installation is priced at the commercial rate. Real figures depend on the equipment, the roof, the tariff track and the installer's quote.
Questions
How accurate is it?
It's a first estimate from factors typical for Israel: good for the order of magnitude and for comparing buying with leasing. An exact figure needs a design on the roof itself, with its real shade and area.
What is kWp?
Kilowatt-peak: the system's maximum output in ideal sun. It's what tells you how many kWh the system will make in a year in your region.
Buying or leasing: what's the difference?
Buy, and you pay for the installation and keep all the income from the power. Lease, and another company invests, builds and maintains, while you receive a smaller fixed payment for the roof, with no investment.
Why does a flat roof need more area?
On a flat roof the panels are tilted and the rows are spaced so they don't shade each other, so each kWp takes more m² than on a tiled roof.
Why does output drop over the years?
Panels lose a little efficiency every year. The maths takes a percentage off in year one and a smaller share each year after, so the cumulative profit isn't inflated.
What happens to the number I leave?
It's kept with your estimate, and someone calls you about your roof only. It's never passed on.
3-day free trial
Start with your next address
Type an address, see the roof in 3D, approve a layout and send a proposal today. Everything you create is kept after the trial.
- No credit card
- Nothing to install
- Personal WhatsApp support