Backup-Power Budget: Lights and Device Charging Only

Small batteries can cover lights and charging for days if you size them right. This plan maps simple LED lighting and phone-laptop charging to watt-hours so you buy just enough backup, not a whole generator. Use a one-page calculator, a short table, and three load-cut tricks to stretch runtime.

Storm weeks bring long evenings and network hiccups. Keep it lean: a few LED lights, phone service, and a laptop check-in window. Everything else can wait.

Who this guide is for

Households that only need lighting and device charging during outages.

People watching costs who want the smallest battery that still works.

Apartment dwellers who can’t use fuel generators and need safe indoor options.

Anyone who wants a repeatable sizing method without technical jargon.

Your 10-minute sizing method

Step 1: list your essentials and hours — LED lantern or bulb: 2 units × 4 hours evening = 8 light-hours total; phones: 2 full charges; laptop: 2 hours/day; router optional 6 W × 2 h.
Step 2: assign typical power — LED 10 W; phone 20 Wh incl. losses; laptop 50 W; router 6 W.
Step 3: convert to daily watt-hours (Wh) — Lights 80 Wh; phones 40 Wh; laptop 100 Wh; router 12 Wh; total ≈ 232 Wh/day.
Step 4: choose days of coverage and add overhead — 3 days ≈ 900 Wh usable with buffer.

Small table: quick picks by need

Scenario	Daily Wh target	3-day battery target	Notes
Solo, 1 light + phone	~120 Wh	400–500 Wh	Add a spare phone bank
Couple, 2 lights + phones	~200 Wh	600–700 Wh	Keep AC off except laptop
Couple + laptop check-ins	~230 Wh	800–1000 Wh	Right-size USB-C PD output
Family light-only	~160 Wh	500–700 Wh	USB lanterns over AC lamps

Stretch runtime without spending more

Use DC and USB first. Only turn on AC inverter for laptops; inverters waste power when idling.
Downshift brightness. A 5–8 W LED bulb in a reflective shade lights a room.
Batch tasks. Charge once daily and run laptops in blocks.
Charge smart when grid flickers. Top off the main station first.

Device charging cheat sheet

Phones: ≈ 20 Wh per full charge. 100 Wh bank = 4–6 charges.
Laptops: budget 100–150 Wh per hour for high-draw machines.
Routers: 5–10 W typical; skip if ISP is down.

Safe indoor setup

Keep batteries on hard surfaces, away from heat.
Use certified chargers and avoid daisy-chaining adapters.
LED lanterns only—no flames.
Small solar panels are optional top-ups; expect modest output.

What to do this week

List your exact devices and hours, then set a Wh target.

Buy two USB LED lanterns + one 20 000 mAh power bank.

Practice running all on USB/DC only.

Create a charge-order plan: station → laptop → phones.

Lights and charging do not require a big generator. Size by watt-hours, prioritize USB and DC, and batch your use. A modest battery, a couple of LED lanterns, and disciplined habits carry most households through outages calmly and affordably.

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