Generator Sizing & Selection Guide
Sizing a generator can be difficult - use our calculators to estimate the size you need
Buying a generator for either business or personal use is a significant investment so it is important to get it right first time. There are a few factors to consider when buying a generator so this will help you choose the right unit – the right fuel, the right type and the right size of generator for your needs.
Businesses will normally use 1500rpm generators and choose a good quality manufacturer with excellent aftersales and parts availability.
The petrol can deteriorate over a relatively short time so they are best used often or stored without fuel or fuel ‘stabiliser’ added to increase the time.
Camping and leisure generators are mainly petrol but can also be LPG (gas) – it is rare for a diesel generator to be used for leisure purposes.
All petrol generators run at 3000rpm (for 50hz applications) to ensure they are compact, lightweight and portable.
Diesel generators can be 3000rpm or 1500rpm:-
3000rpm Diesel Generators are cheaper and more compact but can be noisy, have higher fuel consumption and shorter service life.
1500rpm Diesel Generators are more expensive and larger but are much quieter, lower fuel consumption and have a longer service life.
The noise of a diesel generator can be reduced with special acoustic enclosures which are designed to suit the project. A standard enclosure will normally provide a noise level of around 85dB(A) at 1m.
A standby generator for your business is an important aspect of your business continuity and disaster preparedness and recovery plan. The size or rating can be calculated from the equipment already installed or it can be measured over time using a meter on the incoming power supply.
Motors loadings are particularly important for generator sizing as these can place unusual and high loads on the generator for very short periods which need to be taken into account. Motors are found in lifts, air-conditioning units, pumps, fans etc so it is worth spending some time researching the requirements of your building.
Use our motor starting calculator to estimate the size of generator required.
Motor Starting is based on 400V, 3 phase with typical motor performance.
These calculators are based on standard conditions and your installation and application will be different. Please ensure any generator purchased is suitable for your application.
Let us know if you have any questions or queries and we will be happy to give you expert advice.
Call us on 01329 722390 to discuss special pricing, installation, service agreements or special projects.
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