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Wind turbine vs solar panels for home: which one wins?
It is the first question every homeowner asks, and the honest answer is that the wind decides it for you. At 4 m/s annual average, solar wins outright. At 6 m/s, a turbine out-produces the same money spent on panels. Between those points, here is how to place your bet — including the case for buying both.
The maths: output per 1,000 dollars
Solar is predictable: 1 kWp of panels produces 900–1,400 kWh a year in most temperate climates, regardless of what the neighbours built. A turbine's output depends entirely on your site's wind speed, and it scales with the cube — double the average wind and you get eight times the energy.
| Annual mean wind at hub height | 1 kW turbine, kWh/yr | 1 kWp solar, kWh/yr | Winner per dollar |
|---|---|---|---|
| 4.0 m/s | 600 – 900 | 1,000 – 1,300 | Solar, clearly |
| 5.0 m/s | 1,600 – 2,200 | 1,000 – 1,300 | Even — wind slightly ahead |
| 6.0 m/s | 2,800 – 3,600 | 1,000 – 1,300 | Wind, by a wide margin |
The trap is assuming your garden has the regional average wind. Trees, neighbouring roofs and walls cut wind speed dramatically at low height, which is why a roof-mounted panel beats a garden-pole turbine in most suburbs.
Seasonality: winter is where wind pays
Solar output in December is 15–25 % of its July peak in northern Europe and Canada. Wind is the opposite: storms are energy. A 3 kW turbine on a 5 m/s site produces more electricity in January than in July — precisely when an off-grid home's batteries are most stressed and when solar is at its weakest.
If your goal is to cut a grid bill and you can export surplus, solar-only is usually cheaper. If your goal is winter autonomy — an off-grid cabin, a remote house, an unreliable grid — the wind's winter strength is the reason turbines exist.
Practical limits that decide for you
Roof or garden: panels bolt onto a south-facing roof and need no permission in most jurisdictions. A productive turbine needs a tower at least 9–12 m clear of obstacles — many urban and suburban plots simply cannot host one legally or physically.
Noise and neighbours: a turbine is 45–55 dB(A) at 10 m; a panel is silent. If your nearest neighbour is 20 m away, the decision is made for you.
Space: a 3 kW turbine wants a rotor radius of ~2 m plus safety margin; a 3 kW PV array wants ~15 m² of roof. Roofs are usually easier to find than clear wind.
Why the answer is often 'both'
Wind and solar complement each other: the turbine carries winter and night, the panels carry calm sunny days. A hybrid wind-solar system with a shared battery bank delivers the same autonomy with 30–40 % less storage than either source alone, because the no-wind days are rarely also overcast and vice versa.
We build hybrid controllers for exactly this reason — one unit manages turbine input, PV input and the battery bank, and dumps surplus to a heating element when both are full.
