Total Watts Formula:
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Definition: This calculator estimates the total wattage needed for a generator based on the sum of running watts and maximum starting watts.
Purpose: It helps homeowners and professionals determine the appropriate generator size for their power needs.
The calculator uses the formula:
Where:
Explanation: The running watts represent continuous load, while starting watts account for the temporary surge when appliances start up.
Details: Accurate wattage estimation ensures your generator can handle all connected loads without overload, while avoiding overspending on an unnecessarily large unit.
Tips: Enter the sum of all running watts for devices that will operate simultaneously, and the highest single starting watts value among those devices.
Q1: What's the difference between running and starting watts?
A: Running watts are continuous power needs, while starting watts are temporary surges (typically 2-3x running watts) when motors start.
Q2: How do I find appliance wattage?
A: Check manufacturer labels or manuals. Many appliances list both running and starting watts.
Q3: Should I add a safety margin?
A: Yes, it's recommended to add 10-20% to the calculated total for safety and future expansion.
Q4: What if I have multiple motor-driven appliances?
A: Only include the highest starting watts value, as motors typically don't all start simultaneously.
Q5: Can this calculator be used for solar systems?
A: The same principle applies, but solar systems have additional considerations like battery storage and sunlight hours.