Prepper Glossary
What Is Backup Power?
Backup power is any way to run lights, phones, medical devices, or a radio when the wall outlet is dead. In US preparedness it starts small: batteries, a power bank, a flashlight. It scales up to a solar generator or a fuel generator. The first job is information and medicine, not the whole house.
Also called: emergency power, off-grid power (loose search use), backup electricity
FROM THE FIELD
The gear that fails is the gear that sat in a drawer. Accounts from extended outages agree on this even when everything else differs: dead batteries in the flashlight, a power bank at twelve percent, a generator that has never been started. More first-night failures come from untested equipment than from having no equipment at all. This page starts with the smallest layer for that reason.
What to cover first
Rank the loads.
Light
Phone or a NOAA weather radio
Medical devices that legally and safely have a battery plan
A little charge left over
Only then a fridge or a sump, if you own a system rated for it
People skip the flashlight and buy a generator they have never started. That is backwards. See how to start prepping.
Quick facts
What it is
Power when the grid is down
First layer
Batteries, lights, phone bank, radio
Next layer
Portable power station
House layer
Generator with outdoor placement and CO alarms
Scenario
Options
Layers that stay honest
Each layer adds capability and cost. Know the limits before you shop.
Layer
Disposable / rechargeable batteries
What it covers
Lights, radio
Limit
You must rotate them
Layer
Power bank
What it covers
Phones
Limit
Finite; needs a way to refill
What it covers
Quiet box plus optional panels
Limit
Slow refill in weather; size the loads
Layer
Fuel generator
What it covers
Real wattage
Limit
Fuel, noise, maintenance, carbon monoxide
Safety: A fuel generator runs outdoors only, away from windows, with working CO alarms in the house. This page will not tell you how to tie a generator into household wiring. That is an electrician job. Backfeeding kills people.
Sources: CPSC portable generator safety guidance; NFPA generator placement standards.
From the field · The hardest moment is not day one. Accounts describe the same shift around day two, when stored charge runs out, the fridge warms, and the outage stops feeling temporary.
Distinction
Backup power vs off-grid
Off grid is a daily living system. Backup power is the outage layer for a house that still expects the utility to return. Do not shop for a homestead array before you own a radio that works tonight.
What to put in the kits
Home bin
Flashlights, spare batteries, one radio, one power bank
Go bag
Compact light and a small bank
Car
A charger that works in the vehicle. See car emergency kit
Date the batteries on the prepper checklist. Dead AAs are a tradition you do not need.
Common questions
Frequently asked questions
What is backup power for preppers?
It is a way to keep lights, communications, and critical devices running when the outlet is dead.
Do I need a generator?
Not first. You need light, a radio, and phone charge. A generator is an upgrade with fuel and safety costs.
What size power station should I buy?
Size it to the loads you measured, not to a social-media watt number. If you cannot name what you will plug in, you are not ready to buy.
Can I run a generator in the garage?
No. Treat it as outdoor equipment. Carbon monoxide is the risk.
Will solar work in a storm?
Panels need light. Storms are why you also have batteries and stored water.
Does backup power replace stored food?
No. Power does not make calories appear. Keep the prepper pantry.
Related terms
Keep reading
Last updated: September 27, 2026