When the power goes out, your electronic locks, alarm system, cameras, and outdoor lighting stop working the moment their battery backup runs down. Keeping your home secure during an outage means preparing battery backups before an emergency, knowing how to operate every lock by hand, and falling back on basic situational awareness once the technology is gone.
A power outage is any unexpected loss of electrical power, and it can disrupt communications, water service, and transportation for as long as the outage lasts. It can also close nearby stores, banks, and ATMs, which matters for security planning since it changes who is moving through your neighborhood and how long you may need to rely on what you already have at home.
Urgent: Generator and Carbon Monoxide Safety Come First
Before anything else about locks or cameras, know this: a generator can put your family at risk faster than almost any other outage hazard. Carbon monoxide (CO) from a portable generator is colorless and odorless, and it can overcome a person in minutes, often before they notice symptoms like headache, dizziness, weakness, nausea, or confusion.
- Never run a portable generator inside a home, garage, basement, crawlspace, or shed — opening doors and windows does not provide enough ventilation to stop CO from building up.
- Run the generator outdoors only, at least 20 feet from the house, with the exhaust pointed away from windows, doors, and vents.
- Do not run a generator on a porch or in a carport. It is still too close to the home.
- Install battery-powered or battery-backup carbon monoxide alarms on every level of the home and outside sleeping areas.
- If anyone shows symptoms of CO poisoning, get them outside to fresh air immediately and call 911.
The U.S. Consumer Product Safety Commission reports that about 100 people die in the United States each year from CO poisoning linked to portable generators, and most of those deaths happen at home. This is the single most important safety rule in this article.
Keeping Alarms, Cameras, and Lighting Running on Battery Backup
Most home security systems already include some form of battery backup, but the runtime and coverage vary by system and by how many devices you have connected. Before an outage happens, it’s worth confirming what your specific setup can and can’t do.
- Check your alarm panel and camera manufacturer’s documentation for how long the built-in battery backup lasts once utility power is cut.
- Keep camera and router batteries, or a small backup power station, topped off — most systems still need Wi-Fi or a cellular connection to send alerts, and your internet modem and router may not have their own battery backup.
- Keep flashlights, lanterns, and headlamps with fresh batteries staged near doors and bedrooms so you’re not relying on your phone’s flashlight and draining the battery you may need for calls.
- Keep phones and any portable power banks charged ahead of forecasted storms, and know how long your phone’s battery will realistically last if you can’t recharge it.
- If you use a backup power source, list which security devices are the priority to plug in first, since you likely won’t be able to power everything at once.
If you’re deciding how much backup power capacity you actually need for security devices, lighting, and a refrigerator together, our guide to calculating your backup power load walks through how to size that out before you buy anything. For a broader look at solar and battery systems that can keep essentials running for longer outages, see our off-grid living guide.
Manual Lock and Entry Procedures When Systems Lose Power
Electronic deadbolts, smart locks, and automatic garage doors all depend on power or a charged internal battery. Knowing the manual override for each one, before you need it in the dark, is one of the simplest ways to keep your home secure during an outage.
- Learn where the physical key override is on every smart lock in your home, and keep a spare key accessible somewhere other than inside the house.
- If your smart lock uses a battery for emergency power, keep a fresh spare on hand near the door.
- Know how to manually release and lift your garage door by hand if the electric opener loses power, and make sure that release mechanism isn’t blocked by stored items.
- Test your manual procedures occasionally while the power is still on, so the first time isn’t during an actual emergency.
- Keep a traditional keyed deadbolt as a backup on at least one exterior door if your primary lock is fully electronic.
A Decision Path for the First Hour Without Power
- Check whether the outage is limited to your home (a tripped breaker or fuse) or affects the neighborhood, and report a downed power line by staying away from it and calling 911.
- Confirm all exterior doors and windows are manually locked, since electronic locks may default to an unlocked or unknown state when power drops.
- Turn on battery-powered lighting near entry points rather than leaving the home dark, since a lit home is generally a less attractive target.
- If you plan to use a generator, set it up outdoors at least 20 feet from the house before dark, following the safety steps above.
- Keep freezers and refrigerators closed to preserve food, and unplug sensitive electronics and appliances to protect them from a power surge when service returns.
- Check on neighbors, especially older adults or anyone who may depend on electric medical equipment, if it is safe to do so.
Neighborhood Coordination Without Relying on Technology
When the internet and cell towers are congested or down, your neighbors become one of your most reliable security resources. Setting up simple, low-tech coordination before an emergency means you’re not trying to organize it for the first time during one.
- Agree on a simple signal with immediate neighbors, such as a porch light or a note on the door, to show a household is home and okay.
- Exchange phone numbers and, where possible, a walkie-talkie or two-way radio channel that doesn’t depend on cell service.
- Designate an out-of-area contact that household members can reach if local phone lines are jammed, since outside calls sometimes get through when local ones don’t.
- Agree in advance on who checks on elderly or medically dependent neighbors during an extended outage.
Our emergency preparedness family plan guide includes a template for building this kind of communication plan with your own household before you try to coordinate with the wider neighborhood.
Situational Awareness Without Cameras or Alarms
Once your cameras and alarm are down, security shifts from technology back to habits. These are the same fundamentals people used before smart home systems existed, and they still work.
- Walk your property’s perimeter in daylight to check that doors, windows, gates, and sheds are secured, rather than relying on an app to tell you.
- Keep exterior lighting on battery or solar power so entry points aren’t left completely dark at night.
- Avoid announcing an empty house on social media or to unfamiliar people during an extended outage.
- Store valuables and important documents somewhere they can be grabbed quickly if you need to leave, rather than scattered around the house.
- Trust your normal instincts about unfamiliar vehicles or people in the area, and report anything concerning to local law enforcement rather than confronting it yourself.
Self-defense laws and tools vary by state, and nothing here is legal advice. If you want to look at non-lethal options or broader home security planning, our self-defense for preparedness scenarios section covers what to know before you buy anything.
Preparedness Checklist for Home Security During Outages
- Confirmed battery backup runtime for alarm panel, cameras, and router
- Fresh batteries staged for flashlights, lanterns, and smart lock overrides
- Spare physical key stored outside the home, not just inside
- Manual garage door release tested and unobstructed
- Generator plan in place: outdoor location at least 20 feet from the house
- CO alarms with battery backup on every level and near sleeping areas
- Neighbor contact list and check-in plan written down
- Out-of-area emergency contact agreed on with household members
- Portable power bank and phone charged ahead of forecasted storms
Frequently Asked Questions
How long will my home security system run on battery backup during an outage?
It depends entirely on your system and manufacturer. Battery backup times vary widely between alarm panels, individual cameras, and routers. Check your system’s documentation or contact your provider to find the specific runtime for your setup, and don’t assume every device on the system has the same backup coverage.
Is it safe to run a generator in my garage with the door open?
No. Federal safety guidance is clear that a portable generator should never be run inside a home, garage, basement, or shed, even with doors and windows open. Carbon monoxide can build up to lethal levels in minutes. Run generators outdoors only, at least 20 feet from the house, with the exhaust facing away from windows, doors, and vents.
What should I do first if my smart lock stops working during an outage?
Use the manual key override that came with the lock, or the traditional keyed deadbolt if you have one installed as a backup. This is why it helps to test manual overrides and keep a spare key accessible before an emergency happens, rather than during one.
Should I contact my neighbors during a power outage?
Checking on neighbors, especially older adults and anyone who depends on electric medical equipment, is part of official guidance for staying safe during a power outage. It also helps build the kind of informal neighborhood coordination that supports everyone’s home security when normal communication tools are down.
Evidence Limits and Extra Caution
Battery backup runtimes, smart lock override procedures, and generator setup requirements vary by manufacturer, model, and local building code. Always follow the specific instructions and warnings included with your own devices and generator. If you have older adults, young children, or anyone dependent on electric medical equipment in your household, build extra time and a backup plan into every step above, since outages affect these groups more seriously.
Educational Disclaimer
This article is for general educational purposes only and does not constitute legal, safety, or emergency management advice. Self-defense laws vary by state and locality. Always follow the instructions provided with your specific security, generator, and lock hardware, and consult your local emergency management office, utility provider, or a qualified professional for guidance specific to your home and situation.