Backup Power Calculator Guide (UK 2025)

🔌 UK Backup Power Calculator Guide (2025)

Not sure what size portable power station you need? This quick UK-specific guide explains how to calculate runtimes for Wi-Fi routers, lighting, laptops, fridges and other essential devices during a power cut. Use this alongside our free Backup Power Calculator for accurate results.

📊 How the Backup Power Calculator Works

The calculator estimates how long each Bluetti power station can run your devices based on:

  • Wattage (how much power your device draws)
  • Battery capacity of the power station
  • Inverter efficiency (typically 85–90%)
  • Real-world UK usage during power cuts

👉 Use the Backup Power Calculator

⚡ Typical Wattages for Common UK Devices

Here are realistic wattage ranges for everyday household devices in the UK:

  • Wi-Fi Router: 8–12W
  • Smartphone Charging: 5–20W
  • LED Lamp: 5–10W
  • Laptop: 40–65W
  • Television (32–50”): 40–90W
  • Under-Counter Fridge: 60–120W
  • Portable Electric Heater (NOT recommended): 500–2000W+

You can usually find wattage printed on the device label or on the plug-in charger/mains adaptor.

🏠 Recommended Power Stations for UK Scenarios

🔹 Light Backup (Wi-Fi + Phones)

Ideal for staying connected during short outages.

  • Wi-Fi: 6–10 hours
  • Phone charging: 10–20 charges

👉 Bluetti EB3A

🔹 One-Room Backup (Router + Lights + Laptop)

Reliable power for working from home, online access and essential lighting.

  • Wi-Fi + lights + laptop: 12–30 hours

👉 Bluetti AC180P

🔹 Larger or Multi-Day Backup (Modular System)

Best for extended outages, running multiple devices or powering heavier loads.

  • Fridge + Wi-Fi + lighting: 12–48 hours (battery-dependent)
  • Expandable modular system

Note: The AC300 inverter module requires a compatible battery, sold separately.

👉 Bluetti AC300 Inverter Module

👉 Explore Emergency Kits

🧮 How to Estimate Runtime (Simple Formula)

Runtime (hours) = Battery Wh × 0.85 ÷ Device Watts

Example for a Wi-Fi router (10W) using the AC180P (1440Wh):

1440 × 0.85 ÷ 10 = ~122 hours
(Real-world runtimes are usually 25–45 hours due to inverter load and device cycling.)

🏡 Real UK Home Use Cases

Use Case Recommended Model Approx Runtime
Wi-Fi + phone charging EB3A 6–10 hours
Router, lights, laptop AC180P 12–30 hours
Fridge + router + lighting AC300 (modular) 12–48 hours (battery-dependent)
Shed or garden office AC60P / AC200P L 5–20 hours

✔ Final Recommendation

Your backup power needs depend on the length of the outage and the devices you want to run. The calculator gives an exact estimate, and the models below cover every UK scenario:

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👉 Shop All Portable Power Stations

🔗 Related UK Backup Power Guides

⚡ Recommended Power Stations