Backup power is not one product category. A phone battery pack and a whole-house generator solve very different problems, yet both can be the right tool.
The most expensive mistake is shopping for equipment before deciding what must stay powered and for how long.
Make a critical-load list
Write down the equipment that truly matters during an outage: communication devices, a refrigerator, medical equipment, well pump, sump pump, a few lights, or heating-system controls. Record running watts and starting watts from labels or manuals.
Do not automatically include the entire house. Electric resistance heat, central air conditioning, water heaters, and ovens can make a modest backup plan very large and expensive.
- Tier 1: safety, medical, communication
- Tier 2: refrigeration, water, heat controls
- Tier 3: comfort and convenience
Understand power and energy
Watts describe how much power an appliance needs at a moment. Watt-hours describe how much energy a battery stores. A 100-watt load running for five hours uses about 500 watt-hours before conversion losses.
Motors and compressors may need a brief starting surge much higher than their running demand. Any source must accommodate both the continuous load and the surge.
A good backup system is not the one with the biggest number. It is the one that safely powers the jobs you already decided matter.
Compare the main options
Small USB banks are inexpensive and ideal for phones and lights. Portable power stations are quiet and can be used indoors, but their batteries are finite and recharging may be slow. Fuel generators can deliver more energy over time if fuel is available, but they create noise, exhaust, maintenance, and safe-storage obligations.
Permanently installed standby systems can start automatically and support larger loads. They cost more and require professional installation, fuel planning, testing, and service. Solar panels can recharge batteries, but output changes with weather, season, shade, and panel area.
Treat generator safety as non-negotiable
Run combustion generators outdoors, far from doors, windows, and vents, according to manufacturer instructions. Never use one in a garage, basement, shed, or covered porch. Use working carbon-monoxide alarms.
Never backfeed a home through a receptacle. A transfer switch or other approved interconnection protects utility workers, equipment, and occupants. Have electrical work completed and inspected as local rules require.
Buy capacity last
After measuring loads, decide on runtime and how the source will be refueled or recharged. Add reasonable margin, but avoid paying to power appliances you can comfortably leave off.
Test the system on a calm day. Label cables, keep manuals accessible, rotate fuel as permitted, and practice a simple startup and shutdown checklist with everyone who may use it.
A practical note: Conditions, equipment, and local rules vary. Check current guidance from relevant utilities, public agencies, manufacturers, and qualified local professionals before making safety-critical changes.