Start with the equipment, not a guessed kVA
Write down each item the generator must supply and copy the electrical details from its nameplate. Identify the loads that will operate together and which can start separately. A generator chosen only from the total running power may not meet the starting requirements.
Information to give your supplier
- Equipment names, quantities and running kW, kVA or amperes.
- Supply voltage, frequency and whether each load is single-phase or three-phase.
- Motors, pumps, compressors and their starting arrangements.
- Operating hours, expected load changes and whether the set is for regular or emergency use.
- Site altitude, ambient conditions and any sensitive electronic loads.
- Planned additional equipment and installation restrictions.
Running load and starting load are different
Motor starting, the sequence of load steps and acceptable voltage or frequency changes affect selection. Ask a qualified designer to assess these requirements against the particular generating set. There is no single percentage margin that makes every generator suitable.
Choose the duty before comparing stock
Read the prime and standby guide, then use the kVA directory to shortlist actual machines. A numerical kVA-to-kW conversion is not a generator sizing assessment.
Send a useful enquiry
Send your load list, operating pattern and destination through the contact page. If replacing a set, include its nameplate and describe any starting or overload problems rather than assuming that the old size was correct.
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.