Generator size calculator

Power rentals for oil and gas, refineries, construction, manufacturing and events need quick fixing. The site should not experience downtime.  

Choosing the correct generator size is key here. Why? A smaller generator size runs the risk of failure, while a bigger size means wasted cost and fuel.  

Calculating the generator size is the quickest way to make the right choice. This way your site never loses power, and you have a reliable estimate to begin with.  

While an online calculator is a good starting point, it’s always better to talk to the experts at Aggreko, as with our knowledge we’ll get the most efficient setup.

Generator sizing is a complex task, and recommendations may vary based on the project.  

Here are key steps to follow when renting generators for your next big project:    

• Estimate your total power needs  

  Start by estimating the total power requirements of the site. You should account for both the starting wattage and the running wattage.  

• Convert load to generator size  

  Your equipment’s power is rated in kilowatts(kW), while generators are rated in kilovolt-amps(kVA). Convert kW to kVA using this formula:  

  kVA = kW/Power factor  

  Most generators operate at a power factor of 0.8, but it can vary depending on the onsite requirements. Get in touch with our power team to get actual power estimates.  

• Allow a safety margin  

  In areas with demanding environments, keeping a buffer between the generator size and the total power need is important. This buffer improves efficiency and reduces carbon buildup.