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What Can a 1000kVA Generator Power?

A 1000kVA generator supplies about 800 kW of real power, which suits a large plant, shopping mall, campus or telecom hub.

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Industrial diesel generator set in an outdoor enclosure

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Do not size a generator by adding up nameplates alone. Add the loads that run together, then leave about 30 percent headroom, because motors draw several times their running current when they start.

If you are unsure, send us your equipment list and we will help check the size before you commit.

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List of equipment and their kW or hp ratings
Single-phase or three-phase supply
Largest motor you need to start
Whether loads run at the same time
Delivery location and required date

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Typical Loads for a 1000kVA Generator

About 400 x 1.5 hp split air conditioners (about 1.4 kW each running)
About 2800 x office workstations with monitors (about 0.2 kW each running)
About 151 x 5 hp three-phase borehole pumps (about 3.7 kW each running)
About 74 x 10 hp three-phase motors (about 7.5 kW each running)
About 25 x 30 hp three-phase motors (about 22 kW each running)
About 7 x 100 hp three-phase motors (about 75 kW each running)

Sizing Rules of Thumb

Add up loads that run at the same time, then multiply by 1.25 to 1.3
Start your biggest motor first, then the smaller ones
Three-phase motors start more smoothly on a generator than large single-phase loads
Allow for future growth if you expect to add equipment

When to Size Up

Large motors starting direct-on-line without a soft starter
Welding machines and compressors that cycle on and off
Sensitive electronics that need a clean, stable supply
Loads that will grow within a couple of years

Frequently Asked Questions

Can a 1000kVA generator run my whole building?

It depends on the connected load. At about 800 kW with 30 percent headroom, it can carry about 560 kW of simultaneous load. Send us your equipment list and we will check.