1. What is the Power Cost Calculator?

The UK Power Cost Calculator estimates the electricity cost of running electric motors based on their power rating, operating time, and current electricity rates. It helps businesses and individuals budget for energy expenses.

2. How Does the Calculator Work?

The calculator uses the power cost formula:

Where:

• \( P \) — Power in watts (W)
• \( h \) — Operating time in hours
• \( Cost/kWh \) — Electricity cost in pounds per kilowatt-hour

Explanation: The formula converts watts to kilowatts (dividing by 1000), multiplies by operating hours to get kWh consumed, then multiplies by the cost per kWh.

3. Importance of Power Cost Calculation

Details: Understanding energy costs helps with budgeting, comparing equipment efficiency, and identifying potential savings through energy optimization.

4. Using the Calculator

Tips:

• Enter motor power rating in watts (found on nameplate)
• Input total operating hours (can be daily, weekly, or annual)
• Use current UK electricity rate (default is £0.34/kWh)
• All values must be positive numbers

5. Frequently Asked Questions (FAQ)

Q1: What's the average UK electricity rate?
A: As of 2023, the average is about £0.34 per kWh, but this varies by supplier and tariff.

Q2: How do I find my motor's power rating?
A: Check the motor nameplate for wattage (W) or kilowatt (kW) rating. If only amps are given, use: Power (W) = Volts × Amps × Power Factor.

Q3: Should I use peak or average power?
A: For continuous operation, use nameplate rating. For variable loads, average power may be more accurate.

Q4: Does this account for motor efficiency?
A: The calculation uses input power. For output power, divide by efficiency (typically 70-95% for electric motors).

Q5: How can I reduce motor energy costs?
A: Consider variable speed drives, proper sizing, regular maintenance, and upgrading to high-efficiency motors.