1. What is kWh from HP Calculator?

Definition: This calculator estimates the energy consumption in kilowatt-hours (kWh) based on horsepower (HP) and operating time.

Purpose: It helps engineers, facility managers, and energy auditors determine electrical energy usage of motor-driven equipment.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E_{kWh} \) — Energy consumption (kilowatt-hours)
• \( HP \) — Horsepower rating of motor
• \( t \) — Operating time (hours)
• 0.746 — Conversion factor (1 HP = 0.746 kW)

Explanation: The formula converts horsepower to kilowatts, then multiplies by operating time to get total energy consumption.

3. Importance of Energy Calculation

Details: Accurate energy calculations help in cost estimation, energy efficiency analysis, and electrical system design.

4. Using the Calculator

Tips: Enter the motor's horsepower rating and the expected operating time in hours. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a 0.746 conversion factor?
A: This converts horsepower to kilowatts (1 HP = 0.746 kW), the standard unit for electrical power.

Q2: Does this account for motor efficiency?
A: No, this calculates theoretical energy input. For actual consumption, divide by motor efficiency (typically 0.8-0.95).

Q3: Can I use this for multiple motors?
A: Calculate each motor separately and sum the results, or use total HP if all operate for the same duration.

Q4: How accurate is this calculation?
A: It provides a good estimate for constant-load applications. Variable loads require more complex calculations.

Q5: What if my motor rating is in kW?
A: Simply multiply kW by operating hours (E_kWh = kW × t), skipping the 0.746 conversion.