Portable power / honest math
STOP DIVIDING
WH BY WATTS.
Build your real appliance load. Account for cycling, cold, battery age, reserve, inverter loss and startup surge. Then compare four 1kWh-class stations on exactly the same job.
Run your load test ↓FIELD ESTIMATEMODEL / 01
1000Wh ≠ 10h7h42after real-world losses
NO BLACK-BOX SCOREMANUFACTURER SPECS LINKEDASSUMPTIONS YOU CAN EDITNO SIGN-UP TO CALCULATE
01 / Build your load
What needs to stay on?
Every assumption stays visible. Change any input and the comparison updates instantly.
Quick add
03 / Same load, four stations
Compare without changing the test.
All stations use the same transparent assumptions. Capacity and output limits come from manufacturer specifications.
StationCapacityRuntimePlan checkSource / shop
A “View price*” label means an affiliate partner link is active. “Official site” is an ordinary manufacturer link. Rankings do not use price or commission.
The compact model
Rated capacity is only the first number.
USABLE ENERGYWh × health × temperature × reserve
DELIVERED ENERGYusable Wh × load-adjusted efficiency
RUNTIMEdelivered Wh ÷ (average load + overhead)
Read every assumption →Before you trust a number
Useful estimates admit what they do not know.
Why not just divide watt-hours by watts?+
That ignores the energy held in reserve, battery health, temperature, inverter conversion loss, inverter idle draw, and appliances that cycle on and off.
Is this independently tested data?+
Not yet. Product capacity and output limits come from linked manufacturer specifications. Runtime is a transparent planning model. We label it as an estimate until repeatable discharge-test data is added.
What does duty cycle mean?+
It is the share of time an appliance is actively drawing its running power. A refrigerator may draw 120W while the compressor runs, but the compressor may run only 35% of an hour.
Can I use this for medical or emergency planning?+
Use it only as a starting estimate. For critical loads, verify the appliance requirements, allow a generous safety margin, and run a full real-world test before relying on the setup.
Do affiliate commissions change the ranking?+
No. Comparison order is calculated from the current load and transparent energy model. Price and commission are not inputs.