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A 300 Wh power station is the entry tier — small, cheap, and light. It is perfect for keeping the essentials alive, but it has clear limits. Here is exactly what a 300 Wh unit runs.
The short answer
A 300 Wh unit comfortably runs a Wi-Fi router, phone, and a laptop (~50 W) for about 5 hours, charges a phone ~25 times, or runs a CPAP for ~6–7 hours. What it cannot do is run a fridge for long, or anything with heat (kettle, heater, microwave). Our pick: the Jackery Explorer 300 Plus.
What a 300Wh power station runs
| Device | Typical draw | Runtime on 300Wh* |
|---|---|---|
| Wi-Fi router + modem | ~20 W | ~12 hrs |
| Laptop | ~50 W | ~5 hrs |
| Phone charge | ~10 Wh each | ~25 charges |
| CPAP (no humidifier) | ~40 W | ~6–7 hrs |
| Mini fridge | ~60 W | ~4 hrs |
*Based on ~85% usable capacity. Avoid heating appliances entirely at this size.
Best 300Wh-class units
Jackery Explorer 300 Plus
288 Wh of LiFePO4 at just 3.75 kg — the most popular entry unit for router, phone, and laptop backup.
EcoFlow RIVER 3 Plus
286 Wh with UPS mode and expandable to 858 Wh if you outgrow the entry tier.
Estimate it yourself
Runtime (hours) = (300 × 0.85) ÷ device watts. A 50 W laptop = 255 ÷ 50 ≈ 5 hours. See our sizing guide for the full method.
Frequently asked questions
Is 300Wh enough for an outage?
For communication essentials (router, phone, laptop), yes — about 5 hours. For a fridge or longer outages, step up to 500–1000 Wh.
Can a 300Wh unit run a fridge?
Only a mini fridge for a few hours. It is too small for a full-size fridge.
300Wh or 500Wh?
300 Wh for pure essentials and portability; 500 Wh for more comfort and a mini fridge.
Related guides
- Best Portable Power Station for Apartment Blackout (2026 Guide)
- Best Portable Power Station for Home Office Backup (2026 Guide)
- Best Portable Power Station for Renters (2026 Guide)
- Best Quiet Portable Power Station for Indoor Use (2026 Guide)
Essentials only
A 300 Wh unit like the Jackery Explorer 300 Plus is the cheapest way to keep internet and devices alive. Need a fridge or longer runtime? Size up.