Live nameplate vs capacity factor - with a cut-in → rated → cut-out band so a calm hub average is not mistaken for rated brochure power.
Planning sketch only. Not an anemometer study, zoning review, or installer quote.
By Ahmet C. Toplutaş·Site owner & editor · Energy & home tools
Last updated May 21, 2026 · Reviewed May 21, 2026 · Planning estimates only - not tax, medical, or investment advice
01
Turbine marketing leads with nameplate capacity - the peak electrical output near rated wind speed. Your bill cares about annual kilowatt-hours, which fold in how often the wind is actually there. Capacity factor (CF) is the bridge: the fraction of nameplate you get across a year.
A 5 kW machine at 30% CF averages 1.5 kW across the year and delivers about 13,140 kWh. The same sticker on a calm suburb can fall near zero useful production if average hub wind sits below cut-in. This page’s decision frame is nameplate ≠ CF - not “bigger kW always wins.”
Decision framing: “What annual energy does this site + machine actually deliver?” - not “What is the largest nameplate I can buy?”
02
Every turbine has an operating envelope. Cut-in is where generation starts. Rated is where nameplate power is reached. Cut-out is where the machine shuts down to survive storms. The panel’s operating band places your average hub wind as a black tick on that range.
Gray left of cut-in means idle. Amber between cut-in and rated means climbing toward nameplate. Green is the rated band. If the tick sits in gray, annual CF math collapses to zero for planning - the brochure curve never starts.
Averages are not time series. A site with 5.5 m/s mean still has hours above rated and hours below cut-in. The band teaches resource honesty; an anemometer campaign teaches the real distribution.
03
Planning production uses a simple product. Wind speed here is meters per second at hub height - not mph. Mixing the two is a classic site-study fail.
Regional base CF is a sketch from typical resource classes. Tower height nudges CF a few points versus the turbine’s catalog hub. Between cut-in and rated, the panel applies a smooth derate so a barely-above-cut-in average does not claim full class CF. Below cut-in or at/above cut-out for the average, production gates to zero.
04
Simple payback = net cost after incentive % ÷ year-1 electricity value. It ignores degradation, O&M escalation, and rate changes so you can see order of magnitude. Rough LCOE divides net cost by a 20-year energy sketch (no degradation) - useful for comparing sites, not for bank models.
Incentives are a dial, not a promise. Federal, state, and utility programs change; paste the percentage you actually qualify for. Net metering, export limits, and demand charges can matter more than a 2-point CF difference.
05
Utility projects stack dozens of machines, wake losses, collection systems, and PPAs. This calculator sizes one small or mid turbine for educational home/commercial sketches. Multiplying by N without wake derates overstates farm output. If you are comparing utility LCOE headlines to a backyard tower, you are comparing different products.
Pair wind with solar ROI and battery storage when the real decision is a hybrid behind the meter - wind alone is rarely the suburban default.
06
Tap site and turbine presets to reproduce these cases. Numbers round for readability.
Example A · Great Plains · 5 kW. Preset: Great Plains (~6.7 m/s, ~35% base CF) · Home 5 kW.
Wind sits between cut-in 3.5 and rated 11 → amber/green band. Annual ≈ 5 × 8,760 × CF. At ~30% effective CF → ~13,000 kWh/yr · avg ~1.5 kW vs 5 kW nameplate - the twin meters make the gap obvious.
Example B · Calm suburb gate. Preset: Calm suburb (~3.2 m/s) · same 5 kW (cut-in 3.5).
Average 3.2 m/s < cut-in 3.5 → black tick in the gray idle zone → 0 kWh/yr in the panel. Raising nameplate does nothing until the site clears the gate. Measure before you shop.
Example C · Coast · taller tower. Windy coast preset · nudge tower above catalog hub.
Higher hub → small positive CF nudge (capped). Year-1 $ and simple payback improve without changing nameplate - resource and height beat sticker shopping.
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No. Nameplate is peak electrical power at rated wind speed. Annual energy is roughly capacity (kW) × 8,760 hours × capacity factor. A 5 kW turbine at 30% CF produces about 13,140 kWh/year - not 5 kW continuously.
Cut-in is the lowest wind speed where the turbine starts producing. Rated is where it reaches nameplate power. Cut-out is where it shuts down to protect itself. The panel’s operating band places your site average on that range so a calm site is not mistaken for a rated-wind brochure.
Below cut-in there is no useful generation in the power curve. An annual average below cut-in is a hard site-quality fail for that machine - raising the tower or picking a lower cut-in model may help, but the calculator will not invent kWh from calm air.
Small wind often lands roughly 15–35% depending on resource class, tower height, and turbulence. Utility onshore farms can run higher. Treat regional presets as planning sketches - anemometer months beat a map average.
Net installed cost (after an incentive %) ÷ first-year electricity value (annual kWh × your rate), ignoring degradation and rate inflation for a clean first look. Real LCOE and cash flow need installer quotes, O&M, and tariff detail.
Neither. It is an educational nameplate-vs-CF sketch with a cut-in gate. Zoning, turbulence from buildings, interconnection, and measured hub-height wind need a site assessment before you buy hardware.
LIVE NAMEPLATE VS CF
Nameplate ≠ CF ↓Site presets
Turbine
Updates live. Nameplate kW ≠ capacity factor. Wind in m/s at hub height - planning sketch only.
Annual production
7,179 kWh
CF 16% · avg 0.82 kW · nameplate 5 kW
OPERATING BAND · CUT-IN → RATED → CUT-OUT
NAMEPLATE
5 kW
Peak at rated wind
AVG FROM CF
0.82 kW
16% × nameplate
Black tick = your average hub wind. Gray = idle, amber = climbing toward nameplate, green = rated band. Nameplate is a sticker; CF turns it into annual kWh.
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