When it comes to power and lighting hire, especially for events, understanding the technical specifications of the equipment is crucial. At Event Sparks, we often get asked why generators are rated in kVA (kilovolt-amperes) rather than kW (kilowatts). This question is important because it helps our clients make informed decisions about the equipment they need. So, why are generators rated in kVA? In this post we will delve into the reasons behind this practise and how it impacts your event planning.

Understanding kVA & kW

To grasp why generators are rated in kVA, we need to differentiate between kVA and kW:

• kVA (kilovolt-amperes): This is a measure of apparent power. It considers both the real power (kW) and the reactive power (kVAR). Apparent is the total power supplied by the generator, irrespective of how it is used by the electrical devices.
• kW (kilowatts): This is a measure of real power. It represents the actual power consumed by the devices and equipment, which is converted into work and heat.

The Role of Power Factor

The key concept linking kVA and kW is the power factor. The power factor is a dimensionless number between 0 and 1 that represents the efficiency with which the electrical power is converted into useful work output. It is defined as the ratio of real power to apparent power:

Power Factor = kW/kVA

For most practical purposes, power factors are less than 1 due to the nature of electrical loads, which can be inductive (like motors and transformers) or capacitive (like capacitor banks).

Why Are Generators Rated in kVA?

Generators are rated In kVA for several reasons:

1. Comprehensive Measurement: Rating generators in kVA provides a more comprehensive measurement of the generator’s capacity. It accounts for both real power and reactive power, thus giving a complete picture of the generator’s ability to supply power.
2. Independence from Load Type: The kVA rating remains constant regardless of the type of load. Whether the load is purely resistive (with a power factor close to 1) or inductive (with a lower power factor), the kVA rating stays the same. This consistency is crucial for assessing the generator’s capability without worrying about the variations caused by different types of electrical loads.
3. Ease of Comparison: When comparing generators from different manufacturers or for different applications, using a common unit like kVA makes this process easier. It allows for a straightforward comparison of their maximum output potential without delving into the specifics of each application’s power factor.
4. Simplified Sizing: When planning an event, understanding your power requirements in kVA can help in sizing the generator more accurately. Since event setups often involve a mix of lighting, sound systems and other equipment with varying power factors, kVA offers a reliable basis for calculation.

Practical Implications for Event Planning

When you hire a generator from Event Sparks, knowing the kVA rating helps you ensure that you have sufficient power for all your equipment. Here are a few tips to keep in mind:

• Assess Your Total Load: Calculate the total power requirement of all your equipment in kW and convert it into kVA using an average power factor. For example, if your total load is 80kW and the average power factor is 0.8, you would need a generator of at least 100kVA.
• Account for Peak Loads: Events can have varying power demand, with peak times requiring more power. Make sure to factor in these peaks to avoid overloading the generator.
• Consult With Our Experts: Our team at Event Sparks can help you accurately determine your power needs. We consider the types of equipment you’ll be using and their specific power factors to recommend the most suitable generator. Just simply provide us with your total power load in kW and we’ll do the rest.

Conclusion

Understanding why generators are rated in kVA is essential for efficient and effective planning. This rating system ensures you get a comprehensive view of the generator’s capacity, independent if load type, making it easier to compare, size and select the right equipment. At Event Sparks, we’re here to help you navigate these technical details, ensuring your event runs smoothly with reliable power and lighting solutions.

For more information or to get a quote for your next event, don’t hesitate to contact us!