1. What is the Watts per HP Calculation?

The watts per horsepower calculation converts mechanical power (horsepower) to electrical power (watts). This is particularly useful for sizing solar panel systems to power electric motors.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( HP \) — Horsepower (mechanical power)
• \( 745.7 \) — Conversion factor (1 HP = 745.7 watts)

Explanation: This conversion is based on the definition of 1 horsepower as equal to 745.7 watts.

3. Importance of Watts Calculation

Details: Accurate power conversion is essential for designing solar power systems, selecting appropriate inverters, and ensuring sufficient energy production.

4. Using the Calculator

Tips: Enter the horsepower value you want to convert. The calculator will provide the equivalent power in watts.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 745.7?
A: This is the standard conversion established in the International System of Units (SI) where 1 horsepower is defined as exactly 745.7 watts.

Q2: Is this calculation different for metric horsepower?
A: Yes, metric horsepower (PS) uses a conversion factor of 735.5 watts. This calculator uses mechanical horsepower.

Q3: How does this relate to solar panel sizing?
A: Solar panels are rated in watts, while motors are often rated in HP. This conversion helps match solar capacity to motor requirements.

Q4: Should I account for efficiency losses?
A: Yes, real-world systems have efficiency losses (typically 15-25%). Multiply the result by 1.2-1.3 for a more accurate solar panel size.

Q5: What about starting current for motors?
A: Motors often require 3-5 times their rated power during startup. This should be considered in system design.