Payback is the number of years until your savings equal what you paid. It is the most quoted solar statistic and also the most abused, because the answer swings with a handful of assumptions. Here is how to compute it yourself and see which assumptions matter. All amounts are in Canadian dollars (CAD).
The basic formula
Payback in years equals net cost divided by yearly savings.
Net cost is the installed price minus any incentives you have confirmed you will receive. Yearly savings is the value of the electricity the system produces, either by avoiding purchases or by earning export credits.
Suppose a 7 kW system costs $21,000 and produces about 8,500 kWh a year. If every kWh is worth 15 cents, savings are $1,275 a year and payback is about 16.5 years. If each kWh is worth 22 cents, savings are $1,870 and payback falls to about 11.2 years. Same system, very different answer, which is why your own rate matters more than an average.
Step by step
1. Get a real net cost
Use a written quote. Then subtract only incentives whose terms you have verified. The federal Canada Greener Homes Grant, up to $5,000 for solar PV, closed to new applicants in early 2024, and the Greener Homes Loan stopped taking new applications on 1 October 2025 according to Natural Resources Canada, as reported. Provincial programmes such as Ontario’s Home Renovation Savings programme and a BC Hydro solar rebate were reported active in 2026, but terms change often, so check them using our incentive checking guide.
2. Estimate annual production
Use the installer’s site-specific figure, and sanity check it. In southern Canada a kW often yields roughly 1,100 to 1,400 kWh a year, so a 7 kW system suggests about 7,700 to 9,800 kWh.
3. Value each kWh properly
Not every kWh is worth the same. Power you use at home as it is produced avoids your full variable rate. Power you export earns whatever your utility credits. Where credits are at or near retail and roll over, the two are close. Where credits are below retail, the exported share is worth less. The net billing versus net metering article explains how to model each.
Split your estimate: say 40 percent used directly and 60 percent exported, then price each share separately.
4. Divide
Net cost divided by yearly savings gives simple payback.
Worked examples
All three use the same 7 kW system at $21,000 and 8,500 kWh a year. They are illustrations, not forecasts.
| Case | Value per kWh | Yearly savings | Simple payback |
|---|---|---|---|
| Lower-rate province, modest export credit | 12 cents | $1,020 | About 20.6 years |
| Mid-range rate, credits near retail | 18 cents | $1,530 | About 13.7 years |
| Higher-rate province, generous credits | 25 cents | $2,125 | About 9.9 years |
Note how far the range stretches. That is why the often-quoted 8 to 15 years should be read as a typical band for the cases that make sense, and not as a guarantee for any single house.
Adjustments that make the number honest
Degradation
Panels commonly lose about 0.4 to 0.6 percent of output each year. Over a decade that trims production by roughly 4 to 6 percent, which lengthens payback slightly.
Inverter replacement
Inverters often last roughly 10 to 15 years. A replacement can cost a few thousand dollars. If payback is longer than the inverter’s life, include that cost.
Rate changes
If electricity prices rise 3 percent a year, savings grow and payback shortens. If they stay flat, you get the simple case. Model both. Do not rely on aggressive forecasts.
Financing
Interest on a loan raises the true cost. A system financed over ten years at a given interest rate will not match the simple payback, so compare the monthly payment against the monthly savings.
Self-consumption changes
A heat pump or electric vehicle can raise your usage and make more of the solar output useful. A battery changes the picture too, though battery economics are weak where net metering is generous.
Reading the table with care
The middle row is not a prediction for your home. It simply shows what happens when each kWh is worth about 18 cents. Swap in the value from your own bill, including variable delivery charges, and the answer moves with it. If you are unsure how much of your output you will use directly, ask the installer for a modelled split, and compare it against your daytime consumption.
What shortens and lengthens payback
Shorter payback comes from higher electricity rates, generous export credits, lower installed price per watt, verified rebates and a well-oriented, unshaded roof. Longer payback comes from low rates, below-retail export credits, high installation prices, shaded or awkward roofs and a heavy reliance on a battery.
Beyond the break-even point
Payback is a one-sided metric. It says nothing about what happens after. A system that pays back in 12 years and keeps going for another 13 or more, which is the length of many performance warranties, has produced a long tail of low-cost power. On the other hand, a 20-year payback on a 25-year warranty is thin. Our article on whether solar is worth it pulls these ideas into a decision, and the cost overview shows where the net cost comes from.
A final check
Run three scenarios with your numbers: a cautious one with flat rates and an inverter replacement, a middle one, and an optimistic one. If you are still comfortable with the cautious case, the decision is sturdy. More guides are in the costs and savings hub.
Quick answers
What is a typical solar payback period in Canada?
Figures are often quoted at about 8 to 15 years, depending on province, electricity rates, system price and incentives. Low-rate provinces tend toward the long end.
Does payback include the inverter replacement?
A simple calculation does not. Inverters often last roughly 10 to 15 years, so add a replacement cost to be realistic.
Will rising electricity prices shorten payback?
They can, because each kWh the system produces becomes worth more. Rate forecasts are uncertain, so model a flat case and a rising case.
Where to verify
Rules and prices change. Confirm current details with the official bodies below.