Power Runtime is a planning model, not a laboratory certificate. Its value is that every material assumption is visible and changeable.
1. Average appliance load
For every appliance we multiply running watts by quantity and duty cycle. Duty cycle represents the share of time the appliance is actively drawing its listed running power. Startup watts are checked separately against the station surge limit.
2. Usable stored energy
Manufacturer-rated watt-hours are adjusted for starting state of charge, the battery health you select, a temperature factor, and the reserve you want to keep. Starting charge answers how full the station is when the outage begins; reserve is the portion you choose not to use. The current temperature factors range from 65% at extreme cold to 100% between 10°C and 34°C. They are conservative planning assumptions, not product-specific test results.
3. Conversion and idle loss
The model uses a load-adjusted AC conversion efficiency from 76% at very light loads to 88% in the middle of an inverter's range, plus 8W of inverter overhead. Very high loads are penalized. The result includes a low-to-high planning band around the typical estimate.
4. Output safety check
The sum of appliance running wattage, before duty-cycle averaging, is checked against continuous AC output. Duty cycle affects energy and runtime, but it must not make an appliance look easier for the inverter to run while it is on. The conservative sum of startup demand is checked separately against surge output. Real motors may start at different times, manufacturers define surge behavior differently, and some boosted modes alter voltage; a passing estimate is not a guarantee.
Product specification sources
- EcoFlow DELTA 2: 1024Wh, 1800W continuous, 2700W listed surge/boost ceiling
- Anker SOLIX C1000: 1056Wh, 1800W continuous, 2400W listed surge/boost ceiling
- Jackery Explorer 1000 v2: 1070Wh, 1500W continuous, 3000W listed surge/boost ceiling
- BLUETTI AC180: 1152Wh, 1800W continuous, 2700W listed surge/boost ceiling
Known gaps
We have not yet published repeatable discharge curves for these products. Appliance label wattage can differ from measured draw. Battery-management behavior, age, ambient temperature, firmware and individual unit condition can all change the result. Independent test samples are the most important next dataset.