Home & UtilitiesGenerated accuracy model review: 2026-05-06

Generator Sizing Calculator accuracy and testing

This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.

Formula source

Recommended watts = (running watts + largest starting surge watts) x (1 + safety margin percent / 100).

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

Total Running Load: 4,500 W
Largest Starting Surge: 2,000 W
Safety Margin: 20%

Expected outputs

Recommended Generator Size: 7,800 W
Recommended Size: 7.8 kW
Load Before Margin: 6,500 W

Known limitations

This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

All prices, rates, taxes, and usage values are entered by the user.
Calculations run locally in your browser and are not stored by Calwarden.
This is planning math, not financial, tax, engineering, or legal advice.

Unit handling

Total Running Load accepts values in W.
Largest Starting Surge accepts values in W.
Safety Margin accepts values in %.
Recommended Generator Size is displayed in W.
Recommended Size is displayed in kW.
Load Before Margin is displayed in W.

Rounding rules

Number displays use up to 2 decimal places in the calculator UI.
Input precision follows configured step values where provided.

Version history

1.0.0 - 2026-05-06

Generated accuracy and testing page from the current generator-sizing-calculator calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for Generator Sizing Calculator.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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