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5 kW wind turbine for home: output, cost and tower height
A 5 kW turbine with a 5 m rotor produces about 10,000 kWh a year on a 5 m/s site — half to two-thirds of a typical Western household's consumption. It needs a 15–18 m tower, 30–50 m of clear ground and roughly USD 11,000–16,000 installed.
What 5 kW actually runs
| Load | Continuous draw | Annual energy |
|---|---|---|
| Typical house base load (fridge, standby, router, lighting) | 250 – 400 W | 2,200 – 3,500 kWh |
| Heat pump (cold climate, well insulated house) | 600 – 1,200 W average | 5,000 – 10,000 kWh |
| EV, 12,000 km a year | — | 2,000 – 2,600 kWh |
| Water pumping, farm or smallholding | 500 – 1,500 W | 1,500 – 4,000 kWh |
| Workshop with welder and compressor | 1,000 – 3,000 W peaks | 2,000 – 5,000 kWh |
The useful way to think about a 5 kW machine is not '5 kW of supply' but 'about 1.1 kW of average output'. That average is what a battery or the grid has to smooth, and it is what determines how much of your bill it can actually displace.
Annual output by site quality
| Annual mean wind at hub | Output | Capacity factor |
|---|---|---|
| 4.0 m/s | 5,500 kWh | 12.6 % |
| 5.0 m/s | 10,000 kWh | 22.8 % |
| 6.0 m/s | 15,000 kWh | 34.2 % |
| 7.0 m/s | 21,000 kWh | 47.9 % |
Below 4.5 m/s a 5 kW machine is the wrong size: the rotor is too small for the wind, the capacity factor drops under 15 %, and a 2 kW machine on the same tower returns more per dollar spent.
Tower height is not optional on a 5 kW
A 5 m rotor needs a 15–18 m tower. At 12 m the machine sits inside the surface boundary layer on most sites and loses 25–35 % of the energy it would make at 18 m — which is the difference between a ten-year payback and a fifteen-year one.
Ground rules: hub at least 10 m above anything within 100 m; 30–50 m of clear radius for the guy anchors or the foundation footprint; and a cable route to the battery or the meter that stays under 100 m to keep DC losses below 3 %.
Cost, itemised
| Item | USD |
|---|---|
| 5 kW turbine head and controller | 6,900 – 8,400 |
| 15–18 m tower and foundation | 2,400 – 4,200 |
| Grid-tie inverter or battery charger | 600 – 1,800 |
| Cable, switchgear, surge protection | 500 – 1,000 |
| Installation and commissioning | 800 – 2,500 |
| Installed total | 11,200 – 17,900 |
Off-grid adds USD 4,000–9,000 for a lithium bank sized to carry three days of calm, and roughly doubles the controller cost.
5 kW, 3 kW or 10 kW?
Choose 3 kW if your annual consumption is under 6,000 kWh, your site is 5 m/s, and your tower can be 12 m. It costs 30 % less and is easier to permit.
Choose 5 kW if you heat with a heat pump, run an EV, or have a farm load — and your site measures 5 m/s or better at 15 m. It is the largest machine most residential plots can physically accommodate.
Choose 10 kW if you are electrifying a smallholding, a lodge or a micro-grid, have 60 m+ of clear ground, and can build an 18–24 m tower. Below that scale, two 5 kW machines usually beat one 10 kW on installation cost.
Grid-tie or off-grid on a 5 kW
Grid-tie is cheaper and simpler: a certified wind inverter with anti-islanding, an export meter, and no battery. You sell or offset what you do not use, and the turbine can run at its optimum speed without worrying about state of charge.
Off-grid needs a battery that survives a week of calm in summer — typically 20–30 kWh of lithium for a 5 kW machine — plus a dump load to absorb surplus in a gale. Budget the battery at 40–60 % of the total system cost.
