How much electricity does a 20 HP motor consume per hour?

A 20 HP motor (15 kW rated) at 80% load and 90% efficiency draws about 13.3 kW — so it consumes roughly 13.3 kWh per hour. At full load, electrical input rises to ~16.7 kW.

Is a 20 HP motor the same as 15 kW?

Yes. 20 HP × 0.746 = 14.92 kW, conventionally labelled 15 kW on Indian motor nameplates. This is the mechanical output rating. Electrical input depends on efficiency — at 90%, full-load input is ~16.7 kW.

20 HP Motor Running Cost Calculator

Q: What is the running cost of a 20 HP motor per day?

At 8 hrs/day, ₹8/kWh, 80% load, 90% efficiency: a 20 HP motor uses about 107 kWh/day costing roughly ₹854/day. Across 26 working days, that's about ₹22,200/month.

Q: How many units does a 20 HP motor consume per month?

At 8 hrs/day and 26 working days, a 20 HP motor consumes about 2,773 units (kWh) per month. Annual cost at ₹8/kWh ≈ ₹2.66 lakh. Continuous (24×7) operation pushes this to ~9,600 kWh/month, ₹9.2 lakh/year.

Q: Is HT or LT supply better for a 20 HP motor?

20 HP (15 kW) is well within LT (415 V) range. HT supply only makes sense above 75–100 HP or for plant aggregate loads above 100 kVA. For a single 20 HP motor, LT with star-delta or VFD start, plus dedicated MCC feeder, is the standard solution.

Calculate the electricity cost of running a 20 HP (15 kW) industrial motor — used in large compressors, big pumps, blowers and machine-tool main drives across Indian factories.

⚡ 20 HP / 15 kW

Enter Your Operating Conditions

Motor power is fixed at 20 HP (15 kW). Adjust load, efficiency, hours and tariff to your situation.

Load Factor (%)

Typical: 70–85% for 20 HP loads

Motor Efficiency (%)

20 HP IE2: 90.6% min | IE3: 92.1% min

Operating Hours / Day

Working Days / Month

Electricity Tariff (₹ per kWh)

Industrial tariff in India: typically ₹6–12 per kWh

📊 20 HP Motor Cost Breakdown

Actual Power Draw

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Cost per Hour

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Cost per Day

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Cost per Month

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⚡ Annual Electricity Cost (20 HP)

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Monthly Energy Consumption

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Formula: Actual kW = 15 × Load% ÷ Efficiency% | Cost = Actual kW × Hours × Tariff

💡 VFD opportunity at 20 HP: A VFD on a variable-load 20 HP application typically saves —/month or more. Combined with IE3 efficiency, total annual savings often exceed ₹50,000.

About 20 HP Motors

20 HP (15 kW) is in heavy-industrial territory — main drive on machine tools, larger screw compressors, big centrifugal pumps, blowers serving paint booths and dust extraction systems, hydraulic power units for press and injection molding.

Full-load current: ~26 A at 415 V three-phase (PF 0.85, eff 90%). Cable: 6 sq mm copper for short runs (≤30 m), upsize to 10 sq mm for longer runs to keep voltage drop under 3%.

Starting: 20 HP is the size where star-delta is barely sufficient and a VFD or soft starter pays back fastest. DOL inrush of ~156 A will trip standard MCBs and stress your transformer. A 20 HP soft starter costs ~₹40,000; a VFD ~₹50,000–80,000.

Power factor: A 20 HP induction motor at full load runs at PF 0.85–0.88; at 50% load it drops to 0.65–0.70. Capacitor compensation is highly recommended at this size — improves PF to 0.95+ and avoids power-factor penalty on your bill.

⚡ Compare Other Motor Sizes

🏭 Any HP Motor (Custom) 10 HP Motor Cost 15 HP Motor Cost 25 HP Motor Cost 50 HP Motor Cost

📘 Related Resources

Disclaimer

Educational estimate using typical 20 HP motor characteristics. Actual numbers vary with model, ambient conditions, supply voltage and load profile.

Worked Examples — 20 HP Motor

Examples assume 80% load and 90% efficiency (electrical draw ≈ 13.3 kW). Plug your actual numbers into the calculator above.

Example 1 — Single shift (8 hrs/day)

Conditions: 8 hrs/day, 26 days/month, ₹8/kWh

Daily energy = 13.3 × 8 = 106.7 kWh/day
Monthly energy = 106.7 × 26 = 2,773 kWh/month
Monthly cost = 2,773 × ₹8 = ₹22,184/month
Annual cost ≈ ₹2,66,200/year

Example 2 — Double shift (16 hrs/day)

Conditions: 16 hrs/day, 26 days/month, ₹8/kWh

Daily energy = 13.3 × 16 = 213 kWh/day
Monthly cost ≈ ₹44,300/month
Annual cost ≈ ₹5,32,000/year

Example 3 — Continuous (24×7 process)

Conditions: 24 hrs/day, 30 days/month, ₹8/kWh

Monthly energy = 13.3 × 24 × 30 = 9,576 kWh/month
Monthly cost ≈ ₹76,600/month
Annual cost ≈ ₹9,19,300/year

At 24×7 operation, a single 20 HP motor crosses ₹9 lakh/year in electricity. Capacitor compensation alone (~₹15,000 cost) often saves ₹30,000–50,000/year by avoiding the 7.5–10% PF penalty on your bill.

Frequently Asked Questions — 20 HP Motor

A 20 HP motor (15 kW rated) at 80% load and 90% efficiency draws about 13.3 kW — so it uses 13.3 kWh per hour. Full-load input rises to ~16.7 kW.

At 8 hrs/day, ₹8/kWh, 80% load: a 20 HP motor uses about 107 kWh/day costing roughly ₹854/day. Monthly (26 days): about ₹22,200.

At 8 hrs/day, 26 days: about 2,773 units (kWh) per month. Annual cost at ₹8/kWh ≈ ₹2.66 lakh. Continuous operation pushes monthly use to ~9,600 kWh and annual cost to ~₹9.2 lakh.

Yes. 20 HP × 0.746 = 14.92 kW, conventionally labelled 15 kW on Indian motor nameplates. Mechanical output 15 kW; electrical input ~16.7 kW at full load with 90% efficiency.

20 HP (15 kW) is well within LT (415 V) range. HT supply only makes sense above ~75–100 HP or for plant aggregate loads above 100 kVA. For a single 20 HP motor, LT with star-delta or VFD start, plus dedicated MCC feeder, is the standard solution.

At 415 V three-phase with 0.85 PF and 90% efficiency, a 20 HP motor draws about 26 A at full load. Starting current with DOL is 6× FLC ≈ 156 A — reduced to ~52 A with star-delta. Cable sizing: 6 sq mm copper for ≤30 m, 10 sq mm for longer runs.

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