Reliable power supply for wind measurement systems

In many technical applications, reliable, continuous measurement data is important. Especially in the case of wind measurement systems – such as LiDAR, SODAR sensors or measuring masts for recording wind speed, direction and profiles – a stable energy supply is crucial for meaningful measurement campaigns. Especially when locations are located far away from public power grids, the power supply is one of the greatest challenges.

Why do we need autonomous power supply for wind gauges?

Wind gauges are often installed in remote locations, such as:

• on potential wind farm sites,
• in terrain that is difficult to access,
• far from public electricity connections.

There is no grid connection available there, but the devices must still be operated reliably for long periods of time – sometimes up to 12 months. This is absolutely critical, especially for continuous or long-term measurements, as incomplete or failing measurement series significantly impair the data evaluation.

In addition, wind gauges can have additional consumers (e.g . heating) in winter or at extreme temperatures, which significantly increase energy demand and further complicate the supply.

Challenges of off-grid power supply

The typical difficulties for the energy supply of these systems are:

• No power connection option
  Many measuring stations are located where there is no connection to the public power grid – this makes a self-sufficient energy supply indispensable. 
  
  
• Fluctuating or insufficient solar yield
  Solar energy alone depends on the weather. In northern latitudes, in winter or when it is cloudy for a long time, photovoltaics do not always provide enough energy, especially when additional loads such as heating are added.
  
  
• Batteries alone are often not enough
  Batteries offer storage, but during longer periods without solar power, they have to be recharged frequently or are simply not large enough for a self-sufficient long-term supply.
  
  
• Maintenance & Operating Costs
  Fossil generators, batteries that need to be changed regularly or other temporary solutions mean high maintenance and personnel requirements – which is expensive and time-consuming, especially in remote locations.

Solution: Self-sufficient energy supply with fuel cells

A modern and effective solution to these challenges is fuel cell-based power supplies – especially as a hybrid solution combined with solar energy and battery storage.

Why fuel cells?

Fuel cells generate electrical energy directly from a chemical fuel (e.g. methanol or hydrogen), with high efficiency and low emissions. They offer various advantages over traditional off-grid energy sources.

• Weather-independent operation
  In contrast to purely photovoltaic systems, fuel cells are not dependent on sun or wind.
  
  
• No moving parts → high reliability
  Less mechanical wear means longer run times without failure or maintenance needs.
  
  
• Continuous power supply
  Even with very low solar yields or in winter operation, the system reliably supplies energy for all components.
  
  
• Combination with energy storage systems possible
  In hybrid configurations, the fuel cell takes over the basic supply, while solar and battery cover short-term load peaks or store excess energy.

These properties make fuel cells a particularly suitable component for the power supply of off-grid wind measurement systems that need to reliably collect data over long periods of time.

Exemplary solution scenario: Self-sufficient power supply of a wind measuring station

A practical example of an autonomous power supply combines several approaches:

System Components

• Fuel cell as the main energy source
  provides continuous power independent of solar yield.
• Photovoltaic modules to supplement
  cover large parts of the energy requirement during the day and in good weather.
• Battery storage
  buffers short-term load fluctuations and enables energy-efficient peak load supply.

How it works in operation

During the day, solar energy supplies a large part of the demand. Surplus energy is stored in batteries.
In times of low solar radiation or in winter operation , the fuel cell reliably takes over the energy supply – even for additional consumers such as heaters.
The battery storage system ensures a stable supply during peak loads and compensates for temporary fluctuations.

Advantages of this solution

Round-the-clock energy for sensors, data loggers, communication and peripherals.
Low maintenance effort over measurement campaigns of several months.
High operational reliability even in difficult weather conditions or remote locations.

This example illustrates how modern fuel cell hybrid systems can elegantly and reliably solve the challenges of off-grid power supply in measurement technology – especially where classic solutions such as diesel generators or solar power alone reach their limits.