5kW Variable-Pitch Wind Turbine Grid-Connected Project Case
Full Grid Feed-in at Camping Julianadorp, Netherlands
Project Address: Julianadorp, Netherlands
Customer: Camping
Project Summary
At Camping Julianadorp in the province of North Holland, located near the North Sea coastline with an annual average wind speed of 6.5 m/s, Greef Energy deployed a purely grid-connected system consisting of the AH-5KW horizontal-axis variable-pitch wind turbine + GREEF grid-connected controller + 5kW grid-tied inverter. During the first 8 months of operation, the system generated an average of approximately 32 kWh per day, with all electricity fed into the grid for sale. The projected annual revenue is approximately €3,733, and the static payback period is about 2.6 years. The variable-pitch design has ensured continuous, stable operation and zero system failures despite strong North Sea gusts.
1. Project Background and Opportunity
| Project Information | Details |
| Installation Location | Julianadorp, Netherlands |
| Owner | Camping |
| Wind Resource | Annual average wind speed 6.5 m/s; autumn/winter gusts can reach 30 m/s |
| Core Pain Points | Annual electricity consumption at the site is approximately 38,000 kWh, with high peak-season electricity prices; wind resources in the expansive, open area have remained idle year-round |
| Policy Incentive | Under the Dutch SDE++ renewable energy subsidy scheme, the feed-in tariff for small wind power is approximately €0.12/kWh |
| Customer Request | Utilize the open area of the campsite to install a small wind turbine and sell all generated electricity for long-term revenue |
2. System Configuration
| Core Equipment | Specifications / Model | Key Advantages |
| Wind Turbine | AH-5KW Horizontal-Axis Variable-Pitch | Rated power 5kW, 3 blades, rotor diameter 5.6m, cut-in wind speed 2.5 m/s |
| Tower | 12m Freestanding Conical Tower | Hot-dip galvanized for corrosion protection, wind resistance class 12 |
| Controller | GREEF Intelligent Grid-Connected Controller | Variable-pitch servo control, MPPT tracking, automatic synchronization, anti-islanding protection |
| Inverter | 5kW Single-Phase Grid-Tied Inverter | Compliant with IEC 62116, THDi < 3% |
System Structure Diagram:
3. Technical Highlight: Variable Pitch Tackling Strong North Sea Winds
| Condition | Fixed-Pitch Wind Turbine | AH-5KW Variable-Pitch Wind Turbine |
| Strong Gusts (>25 m/s) | Must brake and shut down | Increases pitch angle to spill wind, maintains full-power operation |
| Low Wind Speed (2.5–4 m/s) | Low efficiency, hard to start | Small pitch angle, low-wind capture efficiency boosted by 35% |
| Extreme Storm (>35 m/s) | Severe mechanical brake wear | Feathering protection + electromagnetic braking, zero mechanical wear |
Julianadorp experiences strong North Sea winds during autumn and winter. The annual equivalent full-load hours of the variable-pitch turbine are approximately 600 hours higher than those of a fixed-pitch turbine.
4. Key Operational Data (First 8 Months of Operation)
| Key Indicator | Actual Data |
| Cumulative Electricity Generated | 7,780 kWh |
| Average Daily Generation | ~32 kWh |
| Average Monthly Revenue from Sales | ~€313 |
| Projected Annual Revenue from Sales | ~€3,733 |
| Total System Investment | €10,000 (Turbine + tower + grid connection + foundation) |
| Static Payback Period | ~2.6 years |
| Annual Equivalent Full-Load Hours | ~2,300 hours |
5. On-Site Photographs
6. Customer Testimonial
"Our campsite is close to the sea, and the wind hardly ever stops. The turbine Greef installed last autumn has been running quietly and generating electricity even during storms. We can see the daily generation and revenue on our phones anytime – it feels like a fixed deposit that gets credited punctually every month."
— Camping Owner
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Post time: May-06-2026