Power station runtime calculator: how long will it run your devices?

Name: Jackery Explorer 2000 v2
Brand: Jackery
Price: 999.00 USD

Last updated 2026-10-28

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Quick answer

Runtime in hours is roughly the station's rated capacity (Wh) times 0.85, divided by what your devices draw (W) ^[1]. A 1,024 Wh station running a 150 W load lasts about 5.8 hours. Use the calculator below for your own mix of devices.

Runtime calculator

Watts are typical figures from the linked sources; where a source gives a range we use the high end. Your device's label is the best number, so edit any value.

Custom device WUsable capacity (%) 85% matches the runtime formula published by Jackery and EcoFlow; Bluetti cites 85-95% inverter efficiency.

Model	Capacity (Wh)	AC output / surge (W)	Runtime

Runtime = capacity × usable % ÷ total load. Real runtime varies with temperature, battery age and how often a device cycles (a fridge compressor is not on all the time). Estimates only.

How it works

Power stations lose some energy turning stored battery power into wall-style AC power. Jackery's published formula uses 85% of rated capacity for AC devices ^[1], and that's the default here. Your result will vary with temperature, battery age and how hard the inverter is working, so treat every number as an estimate.

Appliance watts come from maker spec sheets, ENERGY STAR, the U.S. Department of Energy and Honda's generator wattage guide. Each one is cited in the calculator's appliance list. Fridges and freezers cycle on and off, so their real average draw is lower than their running watts and your actual runtime will usually be longer than a constant-draw estimate.

Worked example: an overnight outage

Say the power goes out and you want to keep a full-size fridge, a CPAP and your Wi-Fi router going:

Fridge while the compressor runs: about 150 W, the middle of Honda's 132-192 W range for an ENERGY STAR fridge ^[2]
CPAP (ResMed AirSense 11, maker's typical figure): 56.1 W ^[3]
Wi-Fi router: 6.5 W idle ^[4]

That's about 212.6 W if everything ran nonstop. On a 1,024 Wh station such as the EcoFlow DELTA 3 ^[5], that's 1,024 × 0.85 ÷ 212.6 ≈ 4.1 hours, and in practice longer, because the fridge cycles. On a 2,042 Wh Jackery Explorer 2000 v2 ^[6] it's about 8.2 hours.

Also check starting watts: a fridge can need about 1,200 W for a moment when the compressor kicks on ^[2], so the station's surge rating has to cover it.

Not medical advice. Runtime figures are estimates from the device maker's published power figures and the power station maker's specs. Your machine's draw depends on its settings and accessories. Check your CPAP maker's power guidance (some makers warn against certain accessories or inverters) and talk to your provider or equipment supplier before relying on battery power. Don't rely on a power station as your only backup for life-sustaining equipment; if you use one, make sure you have a plan for longer outages.

What the result means for what to buy

Under about 5 hours for your devices on a 1 kWh unit: look at 2 kWh and up. See best power station for home backup.
Phones, laptops, lights and a CPAP for a night or two of camping: a smaller unit is often enough. See best power station for camping and RV and best under $500.
Comparing brands at the same size: see EcoFlow vs Jackery vs Bluetti.

Price per Wh

							Source

Cycle ratings are the maker's own: cycles until the battery holds the stated % of its original capacity. Jackery rates to 70%, EcoFlow and Bluetti to 80%, so the numbers are not like for like. Prices are from the maker's own store, checked on the date shown. They change often; the retailer's price at checkout applies.

Some prices in this table are sale prices, checked on Oct 28, 2026, and may change; list prices are on each maker's page.

Limits of this estimate

This is an estimate, not a guarantee. It doesn't account for battery age, cold weather, inverter idle draw or devices that change their draw over time. For a CPAP or any medical device, follow your device maker's power guidance and talk to your provider about backup plans. This page isn't electrical advice; connecting a power station to a home's wiring needs a licensed electrician.

Sources

Jackery, Explorer 300 product page FAQ: "Working time = 293Wh* 0.85 / operating wattage of your device". https://www.jackery.com/products/explorer-300-portable-power-station
Honda Power Equipment, Generator Wattage Estimation Guide (refrigerator or freezer, ENERGY STAR: 132-192 W running, 1,200 W starting; generator-maker estimate). https://powerequipment.honda.com/generators/generator-wattage-estimation-guide
ResMed AirSense 11 user guide (typical 56.1 W, peak 73.2 W). https://document.resmed.com/documents/products/machine/airsense-11/user-guide/airsense11_user-guide_anz_eng.pdf
TP-Link 2024 idle power information (Archer AX55: 6.5 W idle). https://www.tp-link.com/us/landing/tp-link-sne-energy-information-2024/
EcoFlow DELTA 3, official US product page (specs and price checked Oct 28, 2026). https://us.ecoflow.com/products/delta-3-portable-power-station
Jackery Explorer 2000 v2, official US product page (specs and price checked Oct 28, 2026). https://www.jackery.com/products/jackery-explorer-2000-v2-portable-power-station