KVA (KVA)
Also known as: kVA · Kilovolt-Ampere · kilo volt ampere · apparent power
KVA (Kilovolt-Ampere) is a unit of apparent electrical power equal to 1,000 volt-amperes, used to rate generators, transformers, and UPS systems. It represents the total electrical load drawn from the supply — including both the real power doing useful work (kW) and the reactive power circulating
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What is KVA?
KVA (Kilovolt-Ampere) is the standard unit of apparent electrical power, equal to 1,000 volt-amperes, used to rate generators, transformers, UPS systems, and large motor loads. Apparent power (S, measured in KVA) is the vector sum of real power (P, kW, doing useful work) and reactive power (Q, kVAR, circulating in inductive/capacitive components). The relationship is S² = P² + Q², which means a load with poor power factor draws more KVA than its useful kW would suggest, increasing demand charges and oversizing transformer requirements.
Common KVA sizing in Indian recycling and CBG plants:
- Small e-waste dismantling unit — 25–50 KVA connected load; demand 15–30 KVA
- Mid-size plastic recycling line (5 TPD) — 100–200 KVA connected; demand 60–150 KVA
- CBG plant (5 TPD biomethane) — 150–300 KVA, dominated by compressor and digester pump motors
- Tyre pyrolysis (10 TPD) — 200–400 KVA, including reactor heating, condenser cooling, and material handling
- Lithium-ion battery dismantling and shredding line — 300–600 KVA depending on inertisation and shredder configuration
KVA also drives sanctioned load decisions with state DISCOMs. Under Indian electricity tariff structures, industrial consumers pay both an energy charge (₹ per kWh) and a demand charge (₹ per KVA of contract demand or actual maximum demand, whichever is higher). Contract demand is typically set 10–20% above expected peak demand; setting it too low triggers penalty for exceedance, while setting it too high wastes monthly demand charges (₹150–350 per KVA per month in most states).
Power factor improvement is a standard cost optimisation:
- Capacitor banks at the LT panel correct power factor from typical 0.75–0.85 (uncorrected) to 0.95–0.99
- Tariff incentive — most DISCOMs offer 0.5–1.0% energy charge rebate per 0.01 PF improvement above 0.95
- Demand reduction — improving PF from 0.80 to 0.95 reduces KVA demand by 15.8% for the same useful kW, directly saving demand charges
Capex for power factor correction in a 200 KVA plant is ₹2–4 lakh, with payback typically 12–18 months from tariff savings.
Common questions about KVA
Plain-English answers to what people most often ask.
What is the full form of KVA?
What is the difference between KVA and kW?
Why are generators rated in KVA and not kW?
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