Independent knowledge for industrial generator buyers on ChinaBay Power

Diesel generator buying guide

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The useful starting point

Write one requirement that every supplier receives. It should state the essential loads, the operating pattern, the site conditions and the scope of supply. A quotation is only comparable when those assumptions match.

The examples below demonstrate procurement preparation. They are invented teaching examples, not a customer installation, a product recommendation or a generator sizing result.

A worked requirement

Consider a factory requesting standby power for essential operations. The assumed electrical system is 400 V, 50 Hz, three-phase, with an outdoor installation at 40°C and 500 m altitude. These are example inputs to disclose, not universal design conditions.

kW, kVA & power factor

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Two figures describe different things

Kilowatts (kW) describe real power: the rate at which electrical energy performs useful work. Kilovolt-amperes (kVA) describe apparent power. Power factor relates real power to apparent power for the same electrical condition.

The relationship is:

kW = kVA × PF

kVA = kW ÷ PF

Use quantities that describe the same load condition. A rating on the generator data sheet and the actual power factor of your connected load are not automatically the same.

Prime or standby?

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Describe the operating pattern first

A generator used during occasional utility failures has a different job from one supplying a site without a reliable grid connection. Before asking for a rating, describe expected operating hours, load variation, planned maintenance and the role of other power sources.

Do not choose a duty classification solely from a label in a sales listing.

Understand what the labels tell you

Standby ratings describe defined backup duties. Prime ratings describe defined duties in which the set serves as a primary power source, typically with varying load. The exact limits and conditions must be read in the manufacturer’s rating definition for the selected model and applicable standard.

Plan your backup loads

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Start with the consequence of an outage

List the processes affected when utility power is lost. Separate life-safety requirements, process protection, production continuity and convenience loads. These categories can have different electrical, operating and regulatory requirements.

A factory does not necessarily need to restart every machine at once. Document which processes must remain running and which can wait.

Build a load priority map

For each essential load, record the acceptable interruption, starting method, running requirement and restart sequence. Pumps, refrigeration, compressed air and control systems can have different dependencies.

Standby readiness

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Separate observation from maintenance

A readiness walk-through helps identify changes that need attention. It does not replace the manufacturer’s service schedule or the work of a qualified technician. Use the selected model’s manual to establish the required tasks and intervals.

Assign an owner for routine observations and another responsible contact for technical work.

A compact marine generator on display at METS 2011, Amsterdam. The opened enclosure exposes the engine and its connections.

Your generator RFQ checklist

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What you will send

Prepare a brief, a detailed load schedule and a scope checklist. Give every supplier the same revision. The worksheet includes 29 fields with units or formats, clearly labelled example prompts, your response, supplier evidence and open questions.

Do not treat an example value as a default. Use “To confirm” where information is missing and ask the responsible party to resolve it in writing.

Project and site

Record the destination country, installation address or site conditions, target delivery date and a technical contact. Include ambient temperature, altitude and whether the set is indoors, outdoors or in a dedicated enclosure. State any project-specific noise, emissions or documentation requirements for the supplier to review.

About ChinaBay Power

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Who this publication is for

ChinaBay Power helps industrial buyers, importers, contractors and technical teams understand generator specifications and prepare procurement questions. The publication focuses on practical explanations and decision preparation.

Editorial scope & responsibility

ChinaBay Power is the publishing name used on this site. The current guides are introductory procurement resources, not equipment tests, supplier rankings or engineering approvals. A named technical reviewer and verified professional credentials are not presented for this edition.

kW / kVA converter

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Your enquiry, in writing

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Prepare the attachments

Download the sheets you need. Each file is editable without an account. Example values are clearly marked and must be replaced with your actual project information.

RFQ worksheet — 29 fields, units and prompts: site, electrical system, loads, supply scope, acceptance, commercial terms and support.
Load schedule — a worked starting point: record every load and attach motor, drive and UPS details. The example total is not a generator rating.
Quotation comparison — align the offers: compare duty, conditions, included equipment, exclusions and supporting evidence.

Read the worked procurement example before filling the sheets. Mark unknowns as “To confirm” and assign each one to the supplier or project engineer.