15 HP Motor Running Cost Calculator

Calculate the electricity cost of running a 15 HP (11 kW) industrial motor — common for large pumps, mid-size compressors, mixing tanks and heavier conveyors in Indian factories.

⚡ 15 HP / 11 kW

Enter Your Operating Conditions

Motor power is fixed at 15 HP (11 kW). Adjust load, efficiency, hours and tariff to your situation.

Typical: 70–85% for 15 HP industrial use
15 HP IE2: 89.8% min | IE3: 91.4% min
Industrial tariff in India: typically ₹6–12 per kWh

📊 15 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 (15 HP)
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Monthly Energy Consumption
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Formula: Actual kW = 11 × Load% ÷ Efficiency%  |  Cost = Actual kW × Hours × Tariff
💡 VFD opportunity for 15 HP: If load varies (pump, fan, blower), a VFD typically saves —/month or more. 15 HP VFD costs ~₹35,000–55,000 — payback under 12 months on most variable-load installs.

About 15 HP Motors

15 HP (11 kW) is a transition-class size — squarely between "small motor" simplicity and "large motor" sophistication. Common applications: large centrifugal pumps, big screw or piston compressors, heavy mixers, large hydraulic power packs, and primary drives on packaging lines.

Electrical input: Full-load input is ~12.2 kW (with 90% efficiency). At 80% steady-state load, draw is ~9.8 kW. Power factor on a typical 15 HP induction motor is 0.85–0.88 at full load — worse at part-load.

Starting current: 6× FLC ≈ 140–180 A peak with DOL. Star-delta is required by most DISCOMs. For variable-load applications, a VFD is the upgrade with the biggest payback — savings often exceed the IE2 → IE3 upgrade by 3–4×.

Cooling note: 15 HP TEFC motors at 80% load dissipate ~1 kW as heat. Ensure 600 mm clearance around the motor for airflow — clogged fan covers are a top failure cause.

⚡ Compare Other Motor Sizes

🏭 Any HP Motor (Custom) 7.5 HP Motor Cost 10 HP Motor Cost 20 HP Motor Cost 25 HP Motor Cost

📘 Related Resources

Disclaimer

Educational estimate based on typical 15 HP motor characteristics. Actual numbers vary with model, ambient conditions, supply voltage and load profile.

Worked Examples — 15 HP Motor

Examples assume 80% load and 90% efficiency (actual electrical draw ≈ 9.8 kW). Use the calculator above with your real values for accurate results.

Example 1 — Single shift (8 hrs/day)

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

Daily energy = 9.8 × 8 = 78.2 kWh/day
Monthly energy = 78.2 × 26 = 2,034 kWh/month
Monthly cost = 2,034 × ₹8 = ₹16,272/month
Annual cost ≈ ₹1,95,300/year

Example 2 — Double shift (16 hrs/day)

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

Daily energy = 9.8 × 16 = 156.5 kWh/day
Monthly cost = 156.5 × 26 × ₹8 ≈ ₹32,544/month
Annual cost ≈ ₹3,90,500/year

Example 3 — Continuous (24×7)

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

Monthly energy = 9.8 × 24 × 30 = 7,056 kWh/month
Monthly cost ≈ ₹56,448/month
Annual cost ≈ ₹6,77,400/year

At 24×7 operation, a single 15 HP motor crosses ₹6.7 lakh/year. A 25% VFD-driven saving is worth ~₹1.7 lakh/year — far exceeding the VFD cost in the first year.

Frequently Asked Questions — 15 HP Motor

A 15 HP motor (11 kW rated) at 80% load and 90% efficiency draws about 9.8 kW — so it uses 9.8 kWh per hour. At full load, input rises to ~12.2 kW.

At 8 hrs/day, ₹8/kWh, 80% load, 90% efficiency: a 15 HP motor uses about 78 kWh/day costing roughly ₹626/day. Monthly (26 days): about ₹16,300.

At 8 hrs/day and 26 days, a 15 HP motor consumes about 2,034 units (kWh) per month. Annual cost at ₹8/kWh ≈ ₹1.95 lakh. Continuous (24×7) operation pushes this to ~7,000 kWh/month and ₹6.7 lakh/year.

Yes. 15 HP × 0.746 = 11.19 kW, conventionally rounded to 11 kW on Indian motor nameplates. Mechanical output is 11 kW; electrical input depends on efficiency — at 90% it's ~12.2 kW at full load.

Star-delta is the bare minimum required by most DISCOMs for 15 HP. Soft starter or VFD is strongly recommended — soft start eliminates mechanical shock; VFD adds 20–40% energy savings on variable loads. Protection: thermal overload relay set at 120% FLC, single-phase preventer, ELCB, and ideally a phase-sequence relay.

Almost always yes if the load varies — pumps, fans, blowers, compressors with throttle control are perfect candidates. A VFD on a variable-flow 15 HP pump can save ₹40,000–80,000/year by matching speed to demand instead of throttling. 15 HP VFD costs ₹35,000–55,000 → payback typically under 12 months.

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