Electric Motor Efficiency Calculator
Calculate and analyze electric motor efficiency based on input and output power.
W
W
°C
How to Use
- Enter input power in watts
- Enter output power in watts
- Enter operating temperature (default 25°C)
- Click Calculate to get efficiency analysis
Note: Typical marine electric motor efficiency ranges from 75% to 95%. Temperature affects efficiency by approximately 0.1% per degree above 25°C.
Frequently Asked Questions
How efficient are electric boat motors?
Modern brushless electric boat motors achieve 85-95% efficiency, compared to 25-35% for petrol outboards. However, battery energy density is much lower than fuel, limiting range.
What affects electric motor efficiency on a boat?
Load percentage, motor temperature, controller quality, and propeller matching all affect efficiency. Motors are typically most efficient at 60-80% of rated load.