Running Watts vs. Rated (Nameplate) Watts: Which Number Should You Use?
Use running (typical operating) watts for estimating how long a power station will last or how much daily energy an appliance uses; use the nameplate's rated maximum watts as a safety ceiling when checking that a circuit, extension cord, or power station's continuous output rating won't be exceeded — running watts answers "how much will this actually use," while nameplate watts answers "what's the absolute most this could ever draw."
Both numbers are legitimate and useful, but for different questions — mixing them up is one of the most common mistakes in DIY power planning.
When running watts is the right number
For any "how long will this last" or "how much capacity do I need" question — exactly what the Power Station Runtime Calculator and Power Station Size Calculator answer — typical running watts gives a realistic, representative figure rather than an inflated worst case.
When nameplate watts is the right number
For a genuine safety check — confirming a circuit breaker, extension cord, or power strip won't be overloaded — the nameplate's higher maximum rating is the more conservative, appropriate figure to size against, since it guarantees the connection can handle the appliance's absolute worst case, not just its typical draw.