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Backup power for a laptop, router and fan in Nigeria

Build the setup around your workday, not the number of rooms in your flat.

By Bankole Emmanuel · 22 September 2026 · Calculation guide, not a product test

1. Write down what must stay on

Split your appliances into essentials and optional loads. For a home-working setup, that may mean a laptop, an internet router or fibre terminal, a fan and lighting. A kettle, iron or electric cooker is a different load category; do not quietly add one to a small office-backup plan.

Read the exact model labels and manuals. A laptop adapter’s rated output is its maximum capability, not a measurement of what the laptop draws all day. A plug-in energy meter used according to its instructions can give a more useful picture of actual consumption.

This example assumes every listed device runs for all eight hours at the stated average. If the lights are needed for only two hours, their contribution falls to 24 Wh and the daily total becomes 880 Wh.

2. Convert appliance energy into a battery estimate

For a simplified example, assume you can use 90% of a battery’s nominal energy and the conversion path is 90% efficient. Ignoring separate idle consumption:

Those percentages are modelling choices, not promises about a particular battery. Use the product’s documented limits and measured performance where available. If a manufacturer already reports delivered AC energy, do not deduct the same conversion losses again.

A nominal 1 kWh unit would give about 6.8 hours at a constant 119 W under those same assumptions, not eight hours. Try your own figures in the battery runtime calculator.

3. Check output power and compatibility

Battery capacity in Wh answers an energy question. Continuous output in W answers how much equipment the unit can support at once. Startup requirements, socket limits, waveform and manufacturer restrictions still matter. Do not choose an inverter from average watts alone.

For internet equipment, count both the router and any separate fibre terminal. For a DC mini UPS, match voltage, connector size and polarity, and check that its current rating meets the device’s requirement. A plug that fits is not proof of electrical compatibility.

4. Make sure it can recharge in your available window

A backup that takes longer to recharge than the electricity supply allows may start the next outage partly empty. Ask about permitted AC charging power, recharge time, whether charging can occur while loads run, and the limits of any solar input.

Solar-panel wattage is a rated figure, not a guarantee of all-day output. Shading, weather, orientation and the charging hardware affect energy received. A solar quote should include a site assessment rather than simply attach a panel to a battery package.

5. Compare supplier quotes on the same basis

• Exact equipment: manufacturer, model, nominal battery Wh or voltage and Ah, and documented usable capacity.
• Output: continuous W, surge capability and the appliances included in the estimate.
• Runtime: the load list, assumed hours, reserve and losses behind the claim.
• Charging: AC and solar limits, expected recharge time and included accessories.
• Total cost in naira: equipment, delivery, installation, protection and any recurring charges.
• Support: written warranty terms, who handles a fault and where equipment is serviced.
• Installments: deposit plus every repayment and fee, cash-price comparison, missed-payment rules and ownership terms.

For a rented home, confirm permission before fixed wiring or roof work. Ask a qualified installer to assess any connection to household circuits; this article is a planning guide, not a wiring instruction.

Which type of setup fits?

A portable station may suit a small plug-in work area. A separate inverter and battery system may offer different expansion and servicing options. Compare the actual models, charging limits and total installed cost in our inverter versus power station guide.

Sources and method

The table and arithmetic are original illustrative examples. The technical background is supported by Victron’s Phoenix manual, battery-capacity section, and its battery-monitor explanation of effective capacity. Always use the manual for the model you buy.

Found a calculation error? Email hello@wattforhome.com with the page address and the figures. How we handle sources and corrections.