India's most accurate DG Set kVA calculator. Enter your electricity bill load or select your appliances — get an instant generator recommendation for your home, office, factory or farm.
Answers to the most common questions about choosing the right diesel generator for India.
Divide your total connected load in kW by the power factor (0.8 for diesel generators): kVA = kW ÷ 0.8. Always add a 20–25% safety margin. For example, a 20 kW load needs 20 ÷ 0.8 = 25 kVA minimum — so choose a standard 25 kVA DG Set. Use our calculator above for an instant recommendation.
kW (kilowatts) is the real working power your appliances consume. kVA (kilovolt-amperes) is the total apparent power the generator must supply, including reactive losses. The relationship is: kW = kVA × Power Factor. Diesel generators are always rated in kVA — which is why you divide your kW load by 0.8.
A typical 3BHK with 2 ACs (1.5 ton each), ceiling fans, LED lights, refrigerator, TV and a water pump draws roughly 5–7 kW. Dividing by 0.8 gives 6.25–8.75 kVA — so a 7.5 kVA or 10 kVA single-phase generator is ideal. Add headroom if you plan to add another AC or geyser.
Single-phase (230V) generators suit homes and small shops with loads up to ~15 kVA. Three-phase (415V) generators are required for industrial motors, large HVAC systems, commercial buildings and loads above 15 kVA. A simple rule: if your electricity meter is three-phase, choose a three-phase generator. If unsure, check the number of wires on your meter — three-phase has 4 wires.
Look for "Sanctioned Load" or "Connected Load" on your bill — it is shown in kW. Industrial customers should use "Maximum Demand (MD)" in kVA or kW. You can also check the BESCOM Mobile App or MSEDCL app for real-time peak demand. Monthly units (kWh) ÷ (daily usage hours × 30 days) gives your average kW demand.
A generator sized too tightly for today's load becomes inadequate the moment you add a machine, a new AC unit or expand your facility. Industry best practice is to add 20–30% headroom for future growth. This also ensures the generator runs efficiently (generators are most fuel-efficient at 70–80% of rated load) and extends engine life by avoiding constant peak loading.