How many units does a 5 HP motor consume per month?

With 8 hours/day and 26 working days, a 5 HP motor consumes approximately 685 kWh (units) per month. Cost at ₹8/kWh ≈ ₹5,480/month or about ₹66,000/year.

Should I choose 5 HP or 7.5 HP motor?

Choose 5 HP if your peak load stays under 3.5 kW. Oversizing to 7.5 HP increases capital cost and runs at lower load factor (less efficient). Undersizing causes overheating. Match motor rating to actual continuous load × 1.15 safety factor.

5 HP Motor Running Cost Calculator

Q: Is a 5 HP motor the same as 3.7 kW?

Yes. 1 HP = 0.746 kW, so 5 HP = 5 × 0.746 = 3.73 kW (typically rounded to 3.7 kW). Indian motor nameplates often list both ratings.

Q: How can I reduce my 5 HP motor electricity cost?

Three high-impact options: (1) replace with an IE3 premium-efficiency motor — saves 5–8% (payback 12–24 months), (2) install a VFD if load varies — can save 20–40%, (3) avoid running at low load (below 50%) where efficiency drops sharply.

Calculate electricity cost of running a 5 HP (3.7 kW) motor in India — per hour, day, month and year. Pre-populated for typical industrial use.

⚡ 5 HP / 3.7 kW

Enter Your Operating Conditions

Motor power is fixed at 5 HP (3.7 kW). Adjust load factor, efficiency, hours and tariff to match your situation.

Load Factor (%)

Typical: 75–85% for 5 HP industrial motors

Motor Efficiency (%)

5 HP IE2: 86–88% | IE3: 89–91%

Operating Hours / Day

Working Days / Month

Electricity Tariff (₹ per kWh)

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

📊 5 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 (5 HP)

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Monthly Energy Consumption

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Formula: Actual kW = 3.7 × Load% ÷ Efficiency% | Cost = Actual kW × Hours × Tariff

💡 IE3 Upgrade for 5 HP: Replacing standard IE1 with IE3 premium efficiency saves about —/month (5–7% reduction). Payback typically 12–18 months for 5 HP at 8h/day operation.

About 5 HP Motors

5 HP (3.7 kW) is the most common motor size in Indian small-to-medium industry. You'll find them driving small-to-medium centrifugal pumps, exhaust fans, conveyors, light machine tools and small compressors.

Typical electrical input: A 5 HP motor at full load with 90% efficiency draws about 4.1 kW from the supply (mechanical 3.7 kW ÷ 0.90 efficiency). At 80% load — the more realistic operating point — it draws about 3.3 kW.

Starting current: A direct-on-line started 5 HP motor draws 6–7× full-load current at startup (around 60–80 amps for 415V). Use a star-delta or soft starter for repeated starts.

⚡ Compare Other Motor Sizes

🏭 Any HP Motor (Custom) 7.5 HP Motor Cost 10 HP Motor Cost 15 HP Motor Cost 20 HP Motor Cost

📘 Related Resources

Disclaimer

Educational estimate using typical 5 HP motor characteristics. Actual consumption varies with motor model, ambient conditions, supply voltage and exact load profile.

Worked Examples — 5 HP Motor

These examples show how operating hours and tariff change the running cost of the same 5 HP motor. All assume 80% load factor and 90% efficiency (actual draw ≈ 3.3 kW).

Example 1 — Single shift (8 hours/day)

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

Daily energy = 3.3 × 8 = 26.3 kWh/day
Monthly energy = 26.3 × 26 = 684 kWh/month
Monthly cost = 684 × ₹8 = ₹5,475/month
Annual cost = ₹5,475 × 12 = ₹65,700/year

Example 2 — Double shift (16 hours/day)

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

Daily energy = 3.3 × 16 = 52.6 kWh/day
Monthly energy = 52.6 × 26 = 1,367 kWh/month
Monthly cost = 1,367 × ₹8 = ₹10,936/month
Annual cost ≈ ₹1,31,200/year

Example 3 — Continuous (24×7 process)

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

Monthly energy = 3.3 × 24 × 30 = 2,376 kWh/month
Monthly cost = 2,376 × ₹8 = ₹19,008/month
Annual cost ≈ ₹2,28,000/year

Frequently Asked Questions — 5 HP Motor

A 5 HP motor (3.7 kW rated) at 80% load and 90% efficiency draws about 3.3 kW of electrical power. So it consumes roughly 3.3 kWh of electricity per hour of running. At full load it would draw about 4.1 kW.

At 8 hours/day operation, ₹8/kWh tariff, 80% load, 90% efficiency: a 5 HP motor consumes about 26 kWh/day costing roughly ₹211/day. Costs scale linearly with hours and tariff — double the hours, double the cost.

With 8 hours/day and 26 working days, a 5 HP motor consumes approximately 685 units (kWh) per month. Cost at ₹8/kWh ≈ ₹5,480/month or about ₹66,000/year. Continuous (24×7) operation triples this to ~2,400 units/month.

Yes. 1 HP = 0.746 kW, so 5 HP = 5 × 0.746 = 3.73 kW (typically rounded to 3.7 kW). Indian motor nameplates often list both ratings. This is the output mechanical power — electrical input is higher (about 4.1 kW at full load with 90% efficiency).

Three high-impact options for 5 HP motors: (1) replace with an IE3 premium-efficiency motor — saves 5–8% (payback 12–24 months), (2) install a VFD if load varies — can save 20–40% on pump and fan applications, (3) avoid running at low load (below 50%) where efficiency drops sharply. Also: switch off when not needed, and verify supply voltage isn't dropping (low voltage forces motors to draw more current and overheat).

Choose 5 HP if your peak load stays under ~3.5 kW. Oversizing to 7.5 HP increases capital cost and runs at lower load factor (less efficient — 5 HP at 90% load is more efficient than 7.5 HP at 60% load). Undersizing causes overheating. Match motor rating to actual continuous load × 1.15 safety factor.

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