How long will your Jackery, Bluetti, EcoFlow, or other portable power station last? Calculate runtime based on battery capacity and device load.
Keeps communication running through an overnight outage. Add 100W solar panel for indefinite daytime use.
Keeps food cold through a day-long outage. Pair with 200W solar for multi-day coverage.
Two full nights of CPAP operation. Use DC output to maximize efficiency and runtime.
Portable power stations have revolutionized emergency preparedness. Unlike gas generators, they're silent, produce no fumes, and can be used indoors. Brands like Jackery, Bluetti, EcoFlow, and Goal Zero have made reliable battery backup accessible for home emergencies, camping, and off-grid living. But the most common question remains: "How long will it last?"
Power station capacity is measured in watt-hours (Wh). This tells you how much energy the battery can store. Think of it like a fuel tank:
The relationship is simple: more watt-hours means more runtime or the ability to power larger devices.
Calculating runtime is straightforward, but you need to account for efficiency losses:
Runtime (hours) = (Battery Capacity in Wh x 0.85) / Device Wattage
The 0.85 efficiency factor accounts for energy lost during DC-to-AC conversion (the inverter). When you plug in an AC device, the power station converts its DC battery power to AC power, losing about 15% in the process.
Pro tip: If your power station has DC outputs (USB, 12V cigarette lighter), use them when possible. DC-to-DC conversion is about 95% efficient, giving you significantly more runtime.
Best for: Phone/tablet charging, LED lights, WiFi router, laptop charging
Typical runtime: 8-20 hours of light use
Popular models: Jackery 300, EcoFlow River 2, Bluetti EB3A
Best for: All of the above plus mini fridge, CPAP, small TV
Typical runtime: 10-30 hours depending on load
Popular models: Jackery 1000, EcoFlow Delta 2, Bluetti AC200P
Best for: Full-size refrigerator, power tools, multiple devices
Typical runtime: 20-50+ hours for moderate loads
Popular models: Jackery 2000 Pro, EcoFlow Delta Pro, Bluetti AC300
| Device | Typical Wattage | Runtime on 1000Wh |
|---|---|---|
| Smartphone charger | 5-20W | 40-170 hours |
| Laptop | 30-65W | 13-28 hours |
| LED light (single) | 5-15W | 56-170 hours |
| WiFi router | 10-20W | 42-85 hours |
| CPAP machine | 30-60W | 14-28 hours |
| Mini fridge | 50-80W avg | 10-17 hours |
| Full-size fridge | 100-200W avg | 4-8 hours |
| TV (42" LED) | 80-120W | 7-10 hours |
| Electric blanket | 100-200W | 4-8 hours |
| Microwave | 1000-1500W | 0.5-0.8 hours |
Adding solar panels to your power station creates a renewable energy system that can extend runtime indefinitely during daylight hours. Here's how to think about it:
If your solar input exceeds your power consumption, you can run indefinitely during sunny weather. For example, a 200W panel generating 500Wh per day can easily power a 35W load (phones, lights, router) around the clock while keeping the battery topped up.
Manufacturer runtime claims are often optimistic. Here's what to realistically expect:
Refrigerators don't run continuously. The compressor cycles on and off, running about 30-40% of the time. A fridge rated at 150W might average only 50-60W over time. However, in a power outage during summer, the compressor runs more frequently. Plan for 100-150W average draw to be safe.
CPAP machines vary significantly. A basic CPAP without humidifier uses 30-40W. With heated humidifier, expect 50-70W. For best runtime, use a DC-to-DC cable (bypasses the inverter) and turn off the humidifier if comfortable.
When running multiple devices, simply add up the wattages. A setup with a mini fridge (60W), phone charger (10W), and LED lights (15W) draws 85W total. On a 1000Wh station: 850 usable Wh / 85W = 10 hours runtime.
USB ports and 12V outputs are more efficient than AC outlets. A laptop charged via USB-C uses about 95% of the battery's energy vs. 85% through the AC inverter.
In an emergency, focus on: medical devices, communication (phone/router), and food preservation. Entertainment devices can wait until the power returns.
Don't run everything continuously. A fridge stays cold for 4-6 hours unplugged. Run it for a few hours to cool down, then switch to other devices.
Some devices draw power even when "off." Unplug chargers when not in use, and turn off power strips connected to the station.
Keep your power station at 80-100% charge during storm season. LiFePO4 batteries can hold charge for months with minimal degradation.
Planning to add solar? Find out how long it takes to recharge your power station:
A 1000Wh power station can run a typical mini fridge (60-80W average) for 10-14 hours, or a full-size energy-efficient fridge (100-150W average) for 5-8 hours. Actual runtime depends on the fridge's compressor cycling, ambient temperature, and how often the door is opened.
Use this formula: Runtime (hours) = Battery Capacity (Wh) x 0.85 / Device Wattage. The 0.85 factor accounts for inverter efficiency losses. For example, a 500Wh station running a 50W device: 500 x 0.85 / 50 = 8.5 hours of runtime.
For basic emergency backup (phone charging, lights, router): 300-500Wh. For extended outages with a mini fridge: 1000-1500Wh. For full-size fridge plus devices: 2000Wh or more. Add solar panels to extend capacity indefinitely during extended outages.
Yes. A CPAP typically uses 30-60W. A 500Wh power station can run most CPAPs for 7-14 hours, enough for a full night. Use DC output if available to avoid inverter losses. A 1000Wh station provides 2+ nights of CPAP backup power.
Recharge time depends on solar panel wattage and sunlight. With a 200W panel in full sun: a 500Wh station charges in 3-4 hours, a 1000Wh station in 6-7 hours. Real-world conditions with clouds and panel angle typically add 30-50% more time.
Explore runtime estimates for common battery sizes and usage profiles:
For extended outages or larger power needs, consider a generator. Calculate your requirements:
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