Blog
Small wind turbine kit: what is actually in the box?
Most kits are a turbine head, a controller and a manual. The tower, the foundation, the dump load and the cable are usually not in the box — and those missing parts are where the budget goes. Here is how to read a kit listing properly.
The four things every kit must contain
A turbine head: blades, hub, generator, nacelle, yaw assembly and the overspeed protection (furling hinge, mechanical brake or both).
A controller matched to the generator: MPPT or PWM charging, dump load output, over-voltage and overspeed logic, and — for grid-tie kits — an inverter with anti-islanding protection.
A wiring diagram and a commissioning sheet, not just a manual. If the seller cannot tell you the cable gauge for a 60 m run, the kit is incomplete.
A measured power curve. Without one, the annual output figure on the listing is a guess, and you have no way to compare two kits.
Three kit types, three different buyers
| Kit type | Includes | Best for | Typical price band |
|---|---|---|---|
| Battery-charging kit | Head, MPPT controller, dump load, DC cable | Cabins, telecom sites, CCTV | USD 700 – 5,000 |
| Grid-tie kit | Head, wind inverter, meter, AC isolator | Grid-connected homes with a good site | USD 2,500 – 14,000 |
| Wind-solar hybrid kit | Head, PV input, hybrid controller, batteries | Off-grid homes, islands, base stations | USD 3,500 – 20,000 |
The hybrid kit is the one most off-grid buyers should be looking at. A wind-only kit forces you to size the battery for a week of calm; add 1–2 kW of PV on the same DC bus and the battery shrinks by half.
What is almost never included
Tower and foundation. A 9 m tilt-up tower is USD 700–1,200; a 15 m guyed tower USD 1,800–3,000. This is deliberately separate because shipping steel across an ocean costs more than the steel.
Batteries, unless the listing says otherwise. A 48 V, 200 Ah lithium bank is USD 2,000–3,500 and is not part of any standard kit.
Cable and conduit. A 1 kW machine 60 m from the battery needs roughly 25 mm² copper for a 3 % loss — about USD 15–20 per metre installed. Buy the wrong gauge and you lose 15 % of your energy in the cable.
Surge protection. Lightning kills more controllers than wind does. A DC surge arrestor is USD 40 and is missing from most kits.
Permits, grid application, crane hire and labour.
Ten-point checklist before you pay
1. Rotor diameter in metres, not 'rated power'. 2. Rated wind speed quoted honestly (11 m/s is normal, 8 m/s is marketing). 3. Cut-in speed. 4. Survival wind speed and the protection mechanism. 5. Measured power curve in the datasheet. 6. Controller model, and whether the dump load is included. 7. Cable gauge recommendation for a 50–80 m run. 8. Tower options and their foundation drawings. 9. Spare parts availability — blades, bearings, controller — for at least ten years. 10. Certification: CE, and an IEC 61400-2 design statement for anything above 1 kW.
Assembling a kit: what the first day looks like
A 500 W–1 kW tilt-up kit is a two-person, one-day job if the foundation is already cured: assemble blades to hub on the ground, mount the nacelle, run the cable through the tower with a drip loop, raise the tower with a gin pole and a winch, then commission the controller and log the first hour of output.
A 3–5 kW kit on a 12–18 m tower is a three-day job and needs a small crane or a trained rigging crew. Budget USD 800–2,500 for installation labour on top of the kit price, and do not attempt the first raise without someone who has done it before.
