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JustNow 500W Portable Power Station Runtime Calculator
Use this source-linked record to estimate runtime from tracked capacity, output, charging, and weight fields. Unknown specs stay unknown until an official or manufacturer-grade source confirms them.
Quick answer: the JustNow 500W Portable Power Station stores 518 Wh and delivers up to 500 W of continuous AC power. Under this site's planning assumptions (85% inverter efficiency, 10% reserve), a steady 100 W AC load runs for roughly 4.0 hours. Last source check: 2026-08-27. This is an estimate, not a guarantee.
Capacity518 Wh
AC output500 W
Surgeunknown
ChemistryLiFePO4
ConfidenceEstimated
Source regionglobal/general
Checked2026-08-27
Swipe table sideways
| Battery capacity | 518 Wh |
|---|---|
| Battery chemistry | LiFePO4 |
| AC output | 500 W |
| Surge output | unknown |
| DC output | 120 W |
| USB-C output | 60 W |
| Solar input | unknown |
| Weight | 6.6 kg |
| Confidence | Estimated |
| Lifecycle status | Unknown |
| Source region | global/general |
| Last verified | 2026-08-27 |
JustNow has no reachable first-party storefront, so this record uses a retailer-published copy of the manufacturer specification table and stays at estimated confidence. This listing carries no separate model code, so the descriptive product name is preserved. Surge and solar ceilings stay unknown because the table publishes neither.
Runtime Starting Points
These are formula estimates using the tracked capacity, a 10% reserve, and each scenario's default wattage and duty cycle. They are planning starters, not measured runtimes.
Swipe table sideways
| Scenario | Default load | Estimate | Scenario confidence | Station page |
|---|---|---|---|---|
| Full-size refrigerator | 500 W at 33% | 2h 24m | Estimated | Use calculator |
| CPAP without heated humidifier | 40 W at 100% | 9h 54m | Estimated | Use calculator |
| Starlink Mini | 32 W at 100% | 13h 7m | Estimated | Use calculator |
| Wi-Fi router | 12 W at 100% | 1d 10h | Estimated | Use calculator |
| LED TV | 100 W at 100% | 3h 58m | Estimated | Use calculator |
Calculator for this station
Adjust watts, duty cycle, reserve, output path, and startup surge with JustNow 500W Portable Power Station prefilled from the source-linked specs above.
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Power station model
Battery capacity (Wh): 518 WhContinuous output rating (W): 500 WSurge output rating (W): n/a
Estimated runtime6h 36m4h 8m – 8h 12mEstimated runtime: 6h 36m, 4h 8m – 8h 12m
Output path
Estimated runtime
6h 36mEstimated runtime: 6h 36mThis setup may cover a partial outage or single overnight session. Add capacity for more margin.
Conservative4h 8m
Estimated6h 36m
Optimistic8h 12m
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.
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
- Rated battery
- 518 Wh
- Usable energy
- 396 Wh
- 518 Wh x 85% x 90% x 100% x 100%
- Running watts
- 60 W
- Average load
- 60 W
- Max surge
- n/a
- Fixed station overhead
- Unknown (not included)
- 60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
- Estimated runtime
- 6h 36m
- 396 Wh / 60 W = 6h 36m
- Output path
- AC inverter
- Efficiency (%)
- 85
- Reserve kept unused (%)
- 10
- Battery health (%)
- 100
- Cold weather loss (%)
- 0
This link contains the numeric values you entered, but not custom load names.
Source-Backed Next Steps
Smallest matching record (8h)Jackery Explorer 600 Plus
WattRunTime.com
WattRunTime estimate
Estimated runtime
6h 36mThis setup may cover a partial outage or single overnight session. Add capacity for more margin.Usable energy396 Wh
Average load60 W
Fixed station overheadUnknown (not included)
Running watts60 W
Max surgen/a
Runtime range
Conservative4h 8m
Estimated6h 36m
Optimistic8h 12m
Show your work
Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.
Usable energy396 Wh518 Wh x 85% x 90% x 100% x 100%
Fixed station overheadUnknown (not included)60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
Estimated runtime6h 36m396 Wh / 60 W = 6h 36m
Assumptions
- 518 Wh nominal battery capacity
- AC inverter output path
- 85% conversion efficiency
- 10% reserve kept unused
- 60 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.
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Good fit when
- Capacity is best suited to lighter essentials such as routers, laptops, CPAP planning, lights, and smaller camping loads.
- Tracked AC output is 500 W, so high-draw appliances and tools need careful filtering.
- USB-C output is tracked at laptop-class power, useful for direct DC charging when the device supports it.
Watch out for
- Surge output is unknown, so do not assume compressor, pump, or power-tool startup will work.
- Still unknown in the source-backed record: surge output, solar input.
- Confidence is not marked verified; keep the linked source context visible before making a purchase or emergency plan.
Related JustNow Records
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Sources
- JustNow 500W specification table published by retailer OOLACTIVE (retailer; checked 2026-08-27)