Menu
Starlink Runtime Calculator
Starlink power draw varies by kit, temperature, snow melt, router, and AC or DC power path.
Quick answers by battery size
Server-rendered examples using this scenario's sourced planning default. Use the calculator for your exact station and settings.
Swipe table sideways
| Nominal capacity | Estimated runtime | Planning range | Static example |
|---|---|---|---|
| 300 Wh | 2h 42m | 1h 41m – 3h 21m | Review scenario evidence |
| 500 Wh | 4h 30m | 2h 49m – 5h 35m | Review scenario evidence |
| 1,000 Wh | 9h 0m | 5h 38m – 11h 11m | Review scenario evidence |
| 2,000 Wh | 18h 0m | 11h 16m – 22h 21m | Review scenario evidence |
| 3,000 Wh | 1d 3h | 16h 54m – 1d 9h | Review scenario evidence |
These are calculated planning estimates, not measured runtimes. Actual results vary with load, battery condition, temperature, and output path.
Calculator
Start with a quick estimate, then switch to Advanced if you need multiple devices, startup surge, battery health, or cold-weather loss.
Loading calculatorPreparing calculator
This tool didn't load
Something blocked the calculator from starting. Check your connection or reload the page to try again.
Power station model
Battery capacity (Wh): 1024 WhContinuous output rating (W): 1800 WSurge output rating (W): 2700 W
Estimated runtime9h 13m5h 46m – 11h 27mEstimated runtime: 9h 13m, 5h 46m – 11h 27m
Device scenario
Output path
Snow melt, boot, heat, router behavior, and network activity can change draw. This profile uses Starlink's published average range.
Estimated runtime
9h 13mEstimated runtime: 9h 13mThis setup may cover a partial outage or single overnight session. Add capacity for more margin.
Conservative5h 46m
Estimated9h 13m
Optimistic11h 27m
Conservative assumes harder conditions; optimistic assumes favorable conditions.
- This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior.
- Usable energy
- 783 Wh
- Average load
- 85 W
- Fixed station overhead
- Unknown (not included)
- Running watts
- 85 W
- Max surge
- n/a
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
- Rated battery
- 1024 Wh
- Battery capacity (Wh): 1024 Wh
- Usable energy
- 783 Wh
- 1024 Wh x 85% x 90% x 100% x 100%
- Average load
- 85 W
- 85 W running, 85 W average after duty cycle and quantity
- Fixed station overhead
- Unknown (not included)
- 85 W / 85% = 100 W battery draw; fixed overhead is unknown and excluded
- Estimated runtime
- 9h 13m
- 783 Wh / 85 W = 9h 13m
- 1024 Wh nominal battery capacity
- AC inverter output path
- 85% conversion efficiency
- 10% reserve kept unused
- 85 W average load from 1 load
- 100% battery health
- 0% temperature loss
- Fixed station overhead unknown; not included
This link contains the numeric values you entered, but not custom load names.
Source-Backed Next Steps
Smallest matching record (8h)Lion Energy Safari ME
WattRunTime.com
WattRunTime estimate
Estimated runtime
9h 13mThis setup may cover a partial outage or single overnight session. Add capacity for more margin.Usable energy783 Wh
Average load85 W
Fixed station overheadUnknown (not included)
Running watts85 W
Max surgen/a
Runtime range
Conservative5h 46m
Estimated9h 13m
Optimistic11h 27m
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
Rated battery1024 WhBattery capacity (Wh): 1024 Wh
Usable energy783 Wh1024 Wh x 85% x 90% x 100% x 100%
Average load85 W85 W running, 85 W average after duty cycle and quantity
Fixed station overheadUnknown (not included)85 W / 85% = 100 W battery draw; fixed overhead is unknown and excluded
Estimated runtime9h 13m783 Wh / 85 W = 9h 13m
Assumptions
- 1024 Wh nominal battery capacity
- AC inverter output path
- 85% conversion efficiency
- 10% reserve kept unused
- 85 W average load from 1 load
- 100% battery health
- 0% temperature loss
- Fixed station overhead unknown; not included
Warnings
- This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior.
Share URL
Best for
Estimate internet backup runtime.
Starlink Standard worked example
A 1,024 Wh station with 10% reserve and 85% efficiency leaves about 783 Wh before load behavior. Using this page's 85 W default at 100% duty cycle, the planning load is about 85 W and the estimate is 9h 13m.
Change first
- Change watts first if your device label, meter reading, or power path differs from the default.
- Check startup surge for motors, compressors, and pumps.
- Use measured watts for outage or medical-adjacent planning.
Starlink Standard assumptions
Review the Starlink Standard scenario page when you need the wattage range, duty cycle, confidence label, and source notes before calculating runtime.
This calculator gives a planning estimate. Treat the result as a starting point, then refine it with measured watts, the device manual, and the station's current output limits.
Verify your watts
- Check the device label for running watts or input amps and volts.
- Use a plug-in watt meter for AC loads when the result matters.
- For cycling loads, measure long enough to capture on/off behavior.
Check output path
- AC inverter loads usually lose more energy than direct DC loads.
- Keep reserve for cold weather, battery age, and load changes.
- Do not treat label capacity as fully usable watt-hours.
Related Guides
Use these explainers when an assumption changes the runtime result.
Efficiency guide
Inverter Efficiency Losses
Apply the guide to this use case's load and operating pattern.
Related Calculators
Use the related tools when charging, sizing, surge, or power path changes the answer.
FAQ
These answers keep the estimate grounded in assumptions instead of pretending runtime is exact.
How much power does Starlink use?
Starlink Standard and Mini use different power ranges. Check the current specs for your kit, then account for boot draw, snow melt, temperature, router load, and AC or DC conversion losses.
Does cold weather reduce runtime?
Yes. Cold batteries can deliver less usable energy, and heaters, routers, and satellite dishes can also draw more power in harsh conditions.
Why are surge watts different from running watts?
Motors and compressors can need a short startup burst. A station must handle both continuous running wattage and short surge wattage.
Why is real runtime lower than the label capacity?
Battery label capacity is nominal. Inverter losses, DC conversion losses, reserve settings, cold weather, battery age, and changing device loads all reduce real runtime.
How do you calculate portable power station runtime?
Use usable watt-hours divided by average load watts. For AC loads, a practical first-pass formula is battery Wh x efficiency x reserve factor divided by device watts.