Anker SOLIX F3800 Plus
- 3,840 Wh · 6,000 W output
- Solar input up to 3,200 W
- 136.7 lb · expandable
Runs a furnace ≈ 8.2 h
Check price on AmazonHow we calculate it
Runtime = capacity (Wh) × 0.85 ÷ 400 W
For a 24-hour winter outage you need about 11,300 Wh (9,600 Wh of energy plus inverter losses). Running other devices at the same time? Add them in the runtime calculator.
Tips to run your furnace longer
- Older furnaces use a 1/2 HP PSC blower (~800 W running, 2,000 W+ to start). Newer ECM (variable-speed) blowers use only 100–400 W and start softly.
- The blower only runs when the furnace fires. Our runtime assumes it runs about half the time (typical in cold weather); in a severe cold snap it can be 70% or more, in mild weather far less.
- Lower the thermostat by a few degrees and close doors to unused rooms to cut runtime needed per day.
Frequently asked questions
How long will a 1000Wh power station run a furnace?
About 2.1 h, based on an average draw of 400 W and 85% inverter efficiency.
How many watts does a furnace use?
Typically about 800 W while running and up to 2,350 W for a moment at start-up. Averaged over time it draws about 400 W because it cycles on and off.
What size power station do I need for a 24-hour winter outage?
About 11,300 Wh, more than most single units. Consider an expandable model with extra batteries, solar recharging, or a generator.