Factory loads can expose weak generator specifications quickly. A useful RFQ should describe the largest motor starts, the acceptable voltage dip, the load step pattern, and whether sensitive controls share the same bus.
Yangzhou Tesla Power Equipment Co., Ltd. supplies diesel generator sets for export and project use. For this topic, the quotation is only useful when the purchaser states the site conditions, duty rating, voltage, frequency, enclosure preference, and any ATS or control interface requirements.
What buyers should know first
Voltage regulation is not only an alternator line item. The engine response, AVR settings, alternator sizing, cable distance, grounding arrangement, and load sequence all affect what the site will see during startup and transfer.
| Check point | Why it matters | What to send with the RFQ |
|---|---|---|
| Largest motor or compressor | High inrush can pull voltage down during starting | kW, starting method, locked-rotor data if available |
| Sensitive controls | PLCs, drives, and instruments may need tighter limits | Allowed voltage and frequency tolerance |
| Load step sequence | The first seconds after transfer often decide stability | Expected step sizes and timing |
| Cable distance | Long runs add voltage drop outside the generator package | One-line diagram and cable route length |
What to confirm before quotation
- Rated kW/kVA, voltage, phase, frequency, and standby or prime duty.
- Largest starting load and whether soft starter, VFD, or direct-on-line start is planned.
- Expected voltage dip limit during startup and after ATS transfer.
- Alternator brand or performance requirement if the project specification names one.
- Control panel alarms, metering, and communication signals required by the factory system.
Where mistakes usually happen
A common mistake is asking only for generator kW and then adding large motors later. Another is ignoring the cable run between the generator, breaker, ATS, and main distribution board.
Documents to request
- Single-line diagram
- Load list with motor starting method
- Voltage and frequency requirement
- Factory layout or cable distance
- Commissioning test requirement
Related equipment and notes
For equipment selection, compare this requirement with the Cummins diesel generator set and the wider diesel generator set product range. For planning context, also review mixed facility load profile notes.
Common questions
Can kW alone decide voltage regulation?
No. kW is only one input. Starting current, alternator capacity, AVR behavior, cable distance, and load sequence should be checked together.
Should the RFQ include kVA?
Yes. kVA helps the supplier review alternator capacity and power factor assumptions, especially when motors and transformers are involved.
Does ATS selection affect voltage stability?
ATS timing affects the transfer event. Buyers should state transfer logic, starting delay, and whether the generator accepts load in one step or several steps.
What should be checked before handover?
Ask for test records that show voltage and frequency response under planned load steps, plus alarm and protection checks.