Method
Updated · 16 Sep 2026 · Sheet checked · 16 Sep 2026
Running is what you can hold. Surge is a few seconds for a motor. Marketing uses the bigger number. We put running first.
Power stations sell watt-hours. Inverters sell watts. Do not mix them.
For power stations we use a planning assumption: usable Wh = rated Wh × 0.85, then hours = usable Wh ÷ load W. Example at 500 W: rated Wh × 0.85 ÷ 500. We round hours down to one decimal. This is an Outage Stack planning assumption — not a manufacturer runtime claim. We do not invent fuel runtimes on generators.
Desk review of manufacturer sheets at SKU level. Not a lab. No model number, no page. No softening a skip for a future affiliate.