Generator Sizing Tool

BUILDERS POWER PLANNING TOOL

What Size Generator Does Your Home Need?

Select the equipment you want available during an outage. We’ll give you a practical starting point for generator capacity and whether load management may make sense.

Build Your Backup Power Plan

This estimator is designed for early planning. Your final generator size depends on your home’s actual electrical loads, starting current, fuel supply, equipment data and how you want the home to operate during an outage.

Select the loads you want backed up

1. How many central A/C systems do you want available?

Calculator assumption: 4,500 W running + 2,300 W compressor-start allowance per A/C system.
2. What type of heating do you have?
3. Choose major household loads

4. Choose specialty loads

5. Backup goal

Important: This tool provides a preliminary planning estimate only and is not a load calculation, engineering design, installation specification or guarantee of generator performance. Builders Power confirms final sizing after reviewing the home’s electrical system, equipment nameplates, motor starting requirements, fuel source and intended operating strategy. Load management may allow a smaller generator to serve selected larger loads without operating everything at the same time.

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