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How Long Will a Laptop Run on a 300Wh Power Station?

A typical 60W ultrabook or business laptop will get roughly 3–4 full battery charges, or 8–10 hours of plugged-in use, on a 300Wh power station. A 30W Chromebook gets 6+ charges. A 150W gaming laptop gets only 1.5–2 charges or about 4 hours of plugged operation.

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The Math, Worked Out

Formula: (Battery Wh × 0.85) ÷ Device watts = Runtime hours

Battery: 300 Wh

Usable after 15% inverter loss: 255 Wh

60W laptop average running draw: 60 W

(300 × 0.85) ÷ 60 = 4.3 hours plugged in via AC.

Via USB-C PD (bypassing the inverter): roughly 5–5.5 hours at the wall draw level, or about 4 full charges of a 70Wh laptop battery.

Variables That Affect the Answer

  • Workload. A laptop idling at 15W draws 4× less than the same laptop rendering video at 60W. Real average is usually 40–60% of the rated charger wattage.
  • Charger size vs. actual draw. A 65W USB-C charger doesn't mean the laptop pulls 65W constantly — only briefly during fast charging from low battery.
  • Screen brightness and external accessories. A bright screen + external monitor + USB hub easily doubles draw.
  • AC vs. USB-C PD. USB-C bypasses the inverter for ~15% efficiency gain. Use it whenever possible.
  • Battery state of charge. Laptops draw the most power when charging from 0–80%. Trickle charging from 80–100% draws less.

Recommended ~300Wh Power Stations for a Laptop

Three units sized for laptop charging on the go. All three offer USB-C Power Delivery for inverter-free, efficient charging.

Jackery Explorer 300

293Wh · 300W · 60W USB-C PD

7.1 lb ultralight — the classic laptop-backpack power station. 60W USB-C handles most ultrabooks.

Check Price on Jackery

EcoFlow River 3

245Wh · 300W · 100W USB-C PD

LiFePO4 with 100W USB-C — fast enough to keep up with a MacBook Pro under load.

Check Price on EcoFlow

Anker SOLIX C800

768Wh · 1,200W · 100W USB-C PD

For when 300Wh isn't enough — 2.5× the capacity at a modest size upgrade. ~10 full laptop charges.

Check Price on Anker SOLIX

Frequently Asked Questions

Should I use the USB-C PD port or the AC outlet to charge my laptop?
USB-C Power Delivery (PD) is more efficient because it skips the AC inverter — saving 10–15% energy. If your laptop supports USB-C PD at the wattage it needs (60W or 100W are common), use it. Otherwise use the AC outlet with the laptop's standard charger.
How many MacBook Pro charges can I get from a 300Wh power station?
A 14" MacBook Pro has a ~70Wh internal battery. A 300Wh station delivers ~255Wh usable (after losses), so roughly 3.5 full charges. The 16" MacBook Pro (~100Wh battery) gets about 2.5 charges.
Can a 300Wh power station handle a gaming laptop?
Briefly. Gaming laptops draw 150–230W under load — a 300Wh station gives you 1–2 hours of plugged play. For work or web browsing the same laptop draws 30–60W and runs much longer.
Is a 300Wh power station enough for a remote work weekend?
For one laptop + phone, yes — 2 days of moderate use. For laptop + monitor + lights + phone for 2 days, you'll want 500Wh+. Add a 60W solar panel and the 300Wh stays charged indefinitely in good sun.

Want to run the numbers for a different device or battery size? Open the Runtime Calculator .