1. What is Inverter Sizing?

Inverter sizing is the process of determining the appropriate capacity of a power inverter needed to handle your electrical load with a safety margin. The 25% safety margin accounts for startup surges and ensures reliable operation.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Total Load — Sum of all connected devices' wattage
• 1.25 — 25% safety margin factor

Explanation: The safety margin accounts for startup power surges and ensures the inverter isn't constantly running at maximum capacity.

3. Importance of Proper Inverter Sizing

Details: Correct inverter sizing prevents overload, improves efficiency, extends equipment life, and ensures reliable power supply for your devices.

4. Using the Calculator

Tips: Enter the total wattage of all devices you plan to run simultaneously. For motors or compressors, use the startup wattage (typically 2-3x running wattage).

5. Frequently Asked Questions (FAQ)

Q1: Why is a safety margin needed?
A: The 25% margin accounts for startup surges and prevents the inverter from constantly running at maximum capacity, which reduces lifespan.

Q2: What if my devices have high startup currents?
A: For devices like refrigerators or power tools, you may need an even larger margin (up to 50%) to handle the initial power surge.

Q3: Should I consider continuous vs peak power ratings?
A: Yes. The inverter's continuous rating should exceed your total load, and its peak/surge rating should handle startup currents.

Q4: How do I calculate total load?
A: Add up the wattage of all devices that might run simultaneously. Check device labels or manuals for wattage information.

Q5: Does inverter efficiency affect sizing?
A: Most inverters are 85-95% efficient. The calculator already accounts for this in the safety margin.