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What Can a 30kVA Generator Power?

A 30kVA generator supplies about 24 kW of real power, which suits a small shop, clinic, salon or large home.

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

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Typical Loads for a 30kVA Generator

  • About 11 x 1.5 hp split air conditioners (about 1.4 kW each running)
  • About 83 x office workstations with monitors (about 0.2 kW each running)
  • About 4 x 5 hp three-phase borehole pumps (about 3.7 kW each running)
  • About 2 x 10 hp three-phase motors (about 7.5 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 30kVA generator run my whole building?

It depends on the connected load. At about 24 kW with 30 percent headroom, it can carry about 17 kW of simultaneous load. Send us your equipment list and we will check.

Is 30kVA the same as 30 kW?

No. At a 0.8 power factor, 30kVA is about 24 kW of real power.

What current does a 30kVA generator supply?

About 42 amps per phase at 415 V three-phase.

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