What buyers should know first

Data center backup power depends on the generator, ATS or switchgear, UPS coordination, load sequencing, fuel plan, and maintenance access working together. A quotation based only on total IT load is usually incomplete.

In practice

Ask the supplier to confirm standby and prime ratings, controller communication options, step-load assumptions, alternator details, fuel tank arrangement, enclosure noise level if needed, and ATS or paralleling details.

Procurement checklist

• Confirm running load, starting load, voltage, phase, and frequency.
• State whether the generator is for standby duty, prime duty, or mixed project use.
• Confirm silent canopy, open-frame, containerized structure, ATS, or manual transfer needs.
• Send altitude, ambient temperature, installation space, ventilation, and noise limits.
• Request datasheet, engine model, alternator model, controller details, drawings, and packing dimensions.

Common configuration mistakes

Many RFQ problems start when buyers compare only kW or kVA. Rating basis, motor starting demand, site condition, fuel autonomy, service access, and transfer equipment can change the correct configuration. For standby projects with automatic transfer, compare sound proof generator sets with ATS option.

FAQ

What should be sent before asking for price?

Send the load list, voltage, phase, frequency, expected running hours, site condition, enclosure preference, and transfer requirement.

Is standby rating the same as prime rating?

No. Standby rating is for emergency backup. Prime rating is used when the generator carries variable load for longer operating periods.

Should ATS be included in every quotation?

ATS should be included when automatic utility-to-generator transfer is required. Manual or temporary systems may use different switching arrangements.

Can the supplier choose the final size from limited information?

A supplier can suggest a planning range, but final sizing should be checked against real load, starting current, site condition, and project engineer requirements.