Observed arrival · 2026-09-25
A generator-size calculator that accounts for the starting surge
A free calculator estimates generator size from the appliances you plan to run, and estimates portable power station runtime.
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$Paid
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People planning outage, camping, or jobsite power
- Worth noticing
- Its sizing rule targets 80% of running capacity; the page illustrates 1,800 W mapping to at least a 2,300 W generator.
Field notes
The sizing method separates continuous draw from the brief surge needed to start motors, then uses an 80% running-load target; its example turns 1,800 W of load into a recommendation of at least 2,300 W. For battery planning, the page estimates runtime as capacity multiplied by 85% and divided by load, while noting that cold, battery age, and cycling appliances change the result. It also advises checking a generator’s label rather than relying on its model name.
Observed signals
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○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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