What do kVA and kW mean?
kVA is apparent power and kW is real power. Power factor describes the relationship: kW = kVA × power factor. To convert the other way, kVA = kW ÷ power factor. Use the stated power factor for the equipment; do not assume it is always 0.8.
Worked examples at a stated 0.8 power factor
| Apparent power | Power factor | Real power |
|---|---|---|
| 100 kVA | 0.8 | 80 kW |
| 150 kVA | 0.8 | 120 kW |
| 500 kVA | 0.8 | 400 kW |
| 1,000 kVA | 0.8 | 800 kW |
Why the calculation is not a sizing decision
The relationship between these units does not assess motor starting, load steps, site derating or the limits of an engine and alternator. It also does not change a standby rating into a prime rating. Confirm the actual nameplate, duty and application with the equipment supplier.
Compare the right figures
Use our load checklist to prepare your requirement and the duty-rating guide to interpret the nameplate. Then browse used generators by kVA. If a listing gives more than one output, retain the prime and standby labels in your enquiry.
Related generator guidance
Generator sizing · kVA and kW · Selling and valuation checklist · Collection preparation
Technical reference: Cummins generator selection guidance (PDF). Check the manufacturer documentation for the individual set.
Need help with a specific set? Explore used generator stock or talk to UGT.