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What CPCB emission standard applies to diesel generators in India?

All diesel generating sets with capacity between 5 kVA and 15 MW sold and installed in India must comply with CPCB (Central Pollution Control Board) Phase II emission norms, commonly called CPCB II, mandated from July 2014. CPCB II limits emissions of Particulate Matter (PM), Hydrocarbons (HC), Nitrogen Oxides (NOx), and Carbon Monoxide (CO). For Delhi NCR and other Non-Attainment Cities (cities consistently failing NAAQS air quality standards), additional restrictions apply including prohibition of new DG set installations above certain kVA thresholds during air emergency periods. Always verify CPCB II compliance at cpcb.nic.in using the engine model number.

What is the difference between prime power and standby power ratings?

Prime Power rating is the maximum power a genset can deliver continuously for unlimited hours per year with variable load — typically with 10% overload available for 1 hour in 12. Standby Power rating is the maximum power available for emergency use with variable load for a maximum of 200 hours per year — typically 10% higher than prime power. For backup/emergency power applications (which represent most Indian commercial and industrial DG set use), the Standby kVA rating is the appropriate specification. When comparing quotes, ensure all suppliers are quoting the same power rating type — a supplier quoting standby power against a competitor quoting prime power appears 10% larger.

What is an AMF panel and when is it required?

AMF (Automatic Mains Failure) panel automatically detects grid power failure through voltage and frequency sensing, starts the DG set, and transfers the electrical load from the grid to the generator — typically within 5-30 seconds of grid failure. It then monitors grid restoration and transfers back automatically after a time delay, then stops the generator. AMF panels are mandatory for: hospitals, nursing homes, and clinics under NABH and CGHS standards; data centres (typically requiring sub-3 second transfer with UPS bridge); hotels above 3-star (Fire NOC requirement); and any critical load that cannot accept manual changeover. For non-critical applications, manual changeover panels are acceptable and significantly cheaper.

What size DG set is required for a 100-room hotel?

A 100-room hotel requires DG backup assessment covering: guest room loads (2-4 kW per room = 200-400 kW for all rooms), common areas (lobby, restaurant, banquet — typically 50-150 kW), HVAC auxiliary loads (pumps, fans — 30-80 kW), lifts (20-60 kW), kitchen and laundry (30-80 kW), and critical systems (fire pumps, IT servers, emergency lighting — 20-50 kW). Total: typically 350-700 kW connected load. Applying 0.75 demand factor: 260-525 kW, or 325-650 kVA at 0.8 power factor. A typical 3-4 star 100-room hotel installs 500-750 kVA DG capacity, often as 2x250 kVA or 2x400 kVA sets for N+1 redundancy.

How do I calculate fuel consumption for a diesel generator?

Standard diesel generator fuel consumption: approximately 0.28-0.32 litres of HSD per kWh of electrical output (at full load, modern CPCB II compliant engine). Practical formula: Fuel consumption (litres/hour) = kVA x 0.8 (power factor) x 0.28 to 0.32. Example: 100 kVA genset at full load: 100 x 0.8 x 0.30 = 24 litres/hour. At 75% load: approximately 18-20 litres/hour. At 50% load: approximately 14-16 litres/hour (not proportionally linear — diesel engines are inefficient below 50% load). For 8 hours of backup at 75% load: 100 kVA set consumes approximately 150-160 litres, requiring minimum 160-200 litre base tank capacity.