24V Power Supplies

Why choose 24V power supplies for LED strips?

24V LED power supplies offer specific advantages, especially for larger lighting projects and installations where consistency over long distances is essential. This variant is designed to operate more efficiently under higher loads and across longer runs.

• Less voltage drop: Due to the higher voltage (24V versus 12V), the current for the same power is halved. This results in less voltage drop over the length of the LED strip, allowing you to achieve longer uninterrupted light lines without noticeable dimming at the end of the strip. This is valuable for applications such as cove lighting in large spaces or long corridors.
• Longer uninterrupted runs: 24V LED strips can generally achieve longer maximum uninterrupted lengths (often up to 10 meters) than 12V strips (usually up to 5 meters) without noticeable brightness loss. This simplifies the installation of long light lines.
• Thinner cabling: As 24V strips draw less current, thinner wires can be used for installation. This simplifies wiring, reduces material costs, and minimizes heat generation in the wiring.
• Suitable for professional projects: In commercial environments, such as stores, offices, or large warehouses where uniformity and reliability across large areas are required, 24V is the preferred solution.

Types of 24V power supplies and their features

24V power supplies are available in various designs, each with unique features that make them suitable for specific installations and environmental conditions.

Plug-in 24V adapters

These are compact power supplies that plug directly into a standard 230V outlet, similar to mobile phone chargers. They are user-friendly and ideal for smaller installations or projects where a flexible, temporary power source is needed, for instance, in a home for ambient lighting under kitchen cabinets. Plug-in adapters are usually suitable for indoor use (IP20).

Wired (hardwired) 24V LED drivers

These power supplies are connected directly to the 230V mains and are designed for permanent, professional installations. They are often concealed in junction boxes, suspended ceilings, or behind walls, providing a tidy and aesthetically pleasing finish. Wired drivers are available in various IP ratings, making them suitable for dry indoor areas as well as damp or outdoor applications.

Dimmable 24V power supplies

To adjust the light intensity of 24V LED strips, dimmable power supplies are needed. These drivers are compatible with various dimming systems, such as:

• TRIAC (phase-cut): The most common dimming method in residential installations, where the dimmer is placed in the 230V line.
• 0-10V/1-10V: An analog dimming method often used in larger commercial projects for stable and accurate light control.
• DALI: A digital protocol for advanced lighting control, allowing individual LED strips or groups of strips to be controlled and dimmed separately within an extensive network.
• PWM (Pulse Width Modulation): This method rapidly switches the LEDs on and off at high frequency. The ratio between the 'on' time and the 'off' time determines the perceived brightness.

How to choose the right 24V power supply

Selecting the right 24V power supply is crucial for the performance, safety, and lifespan of your LED strip installation. Pay attention to the following important specifications:

Calculating voltage and power

The output voltage of the power supply must exactly match the required voltage of your 24V LED strip. Then calculate the required power (Watt) for the power supply. Multiply the power per meter of the LED strip by the total length of all strips connected to the power supply. Always add a safety margin of at least 20% to prevent overloading and extend the life of the power supply and LED strip(s).

Minimum required power supply (Watt) = (Power per meter LED strip (W/m)) × (Total strip length (m)) × 1.20

Always choose a power supply with a capacity equal to or higher than the calculated value.

IP rating: protection against external influences

The IP rating (Ingress Protection) indicates the level of protection against the intrusion of solid objects (dust) and water. This is essential for the durability of the power supply, especially when installed in damp conditions or outdoors.

Compatibility with dimming systems

If dimming is desired, it is crucial to choose a dimmable 24V power supply compatible with the type of dimmer you use (e.g., TRIAC, 0-10V, DALI). Not every power supply is dimmable, and incompatible combinations can lead to flicker, buzzing, or failures.

Installation tips for 24V LED power supplies

Correct installation of the 24V power supply and LED strips is important for both the safety and performance of the lighting system.

1. Turn off the power: Always start by completely switching off the power supply to the installation point at the main panel. Check this with a voltage tester.
2. Position the power supply: Mount the 24V power supply in a safe, well-ventilated place. Ensure sufficient airflow around the supply to prevent overheating and extend its lifespan. Avoid enclosed spaces.
3. Connect the wiring: Connect the 230V AC mains supply to the input of the power supply (usually marked L and N, and earth). Then, connect the 24V DC output to the LED strip(s), carefully following polarity (+ and -). Use appropriate connectors or terminal blocks for a secure and safe connection.
4. Multiple strips in parallel: If connecting multiple LED strips to one power supply, always do this in parallel. Each strip then receives direct 24V power, minimizing voltage drop and ensuring even brightness throughout the installation.
5. Testing and finishing: Neatly tuck away all cables and make sure there are no exposed wires. Switch the power back on and test the operation of the LED strips and any dimming functionality.

Frequently Asked Questions about 24V power supplies for LED strips

A sustainable choice

Choosing the right power adapter for your LED strips is an important step for a safe, stable, and energy-efficient lighting solution. By considering voltage, power, and environmental factors, you lay the foundation for a sustainable installation that you will enjoy for years to come.