Diesel Generators

Types

• Portable diesel generator — small sets, up to a few kVA, for shops, sites and events.
• Silent or canopy generator — sound-insulated enclosure for use near homes, clinics and offices.
• Standby generator — permanent set with an automatic changeover panel that starts when mains fails.
• Prime and continuous-duty generator — built for sites with little or no grid supply.
• Containerised or trailer-mounted set — for construction sites and temporary installations.

What to check before buying

• Rating in kVA and the power factor, with the load calculated including motor starting current.
• Engine and alternator makes, and whether the set is rated for standby, prime or continuous use.
• Compliance with applicable CPCB emission and noise norms, with the required certificates for the model.
• Control panel and AMF (automatic mains failure) panel, fuel tank size and fuel consumption at load.
• Installation: foundation, exhaust, earthing, cabling, fuel storage and any local approvals.
• Warranty, service network, spare parts availability, AMC and GST invoice.

Common brands include Kirloskar, Cummins, Mahindra Powerol, Ashok Leyland and Greaves.

Who buys them

Hospitals, offices, factories, housing societies, malls, hotels, schools, telecom sites, construction contractors and shops.

Frequently asked questions

What size generator does my building need?

Total the loads that must run during outages, allow for starting current of pumps and lifts, then add a margin. A qualified electrical engineer should confirm the sizing.

What is the difference between standby and prime rating?

Standby is for occasional outages. Prime suits long daily running. Using a standby set continuously shortens its life.

Do I need an AMF panel?

Yes if the set must start automatically during power failure, as in hospitals and data rooms. A manual changeover is acceptable where short delays are fine.