What Happens to an Automatic Gate in a Power Outage? Battery Backup, Manual Release and What SB 969 Does (and Doesn't) Cover

If a car is stuck behind the gate right now, or the gate won’t close on an open property, call our 24/7 emergency gate repair line. Otherwise, read this before the next outage.

Three ways a gate can behave when the power fails

DASMA, the door and gate manufacturers’ association, defines two design philosophies for what happens when a circuit or mechanism fails: fail-safe, which prioritizes safety over security, and fail-secure, which prioritizes security over safety. It defines battery back-up as a system that keeps operating without primary power, typically from batteries. Combine those and an outage plays out one of three ways:

• It keeps running on its backup battery, cycling normally until the battery is spent.
• It opens and stays open, or can be pushed open, so people and emergency vehicles can get through.
• It stays closed and locked until someone uses the release or the power comes back.

Which one you have depends on the operator model, whether a backup is fitted, and how the installer configured it. If you don’t know, find out now from the owner’s manual or the company that services the gate, rather than in the dark during a storm.

Battery backup: what it covers and what it doesn’t

A backup battery lets the operator keep working without utility power. How long it lasts is not one number: it depends on the battery’s capacity, age, and condition, on the size and weight of the gate, and on how often the gate cycles during the outage. Any rated figure has to come from the manufacturer’s documentation for your model. What backup won’t do:

• Outlast every outage. A long outage can run the battery flat, and a battery that is already weak may not get through a short one.
• Replace the manual release. Once the battery is exhausted, you are back to moving the gate by hand.
• Power everything automatically. Ask whether your keypad, call box, and any fire-department switch work on the backup. DASMA’s emergency-access guidance recommends that gates with backup power have their emergency access devices wired directly to the operator.
• Look after itself. Batteries are consumables, and DASMA’s guidance calls for testing backup systems regularly, following the manufacturer’s instructions.

If your operator has no backup, ask whether your model can take one. Operator selection and upgrades are covered on our gate operators and access control page.

How to open an automatic gate without power: the manual release

An automatic gate system should give you a way to move the gate by hand; DASMA’s inspection checklist includes confirming the operator has one. Depending on the model it is a keyed release, a lever or handle, or a design that lets the gate be pushed open once the power is off. Where it is and how it works vary, so the only safe instructions are the ones in your owner’s manual; if you’ve lost it, ask the manufacturer for a copy, or call us with the make and model.

DASMA’s inspection procedure switches the main power off before the release is used. A battery-backed operator is still powered during an outage, which is the point of the backup, so follow the manual’s steps for shutting the operator off first. DASMA lists showing you the power shut-off and the manual disconnect as part of the installer’s handover; if no one did, ask for that demonstration before you need it.

Do not release the gate if it sits on a slope or could roll or swing once freed; the leaf is sagging, damaged, off its track or hinges, or hard to move; strong wind is pushing on a solid panel; or anyone, especially a child, is near its path. ASTM F2200 is written so a gate’s movement is not started by gravity when it is disconnected from the operator; if yours moves on its own, leave it and call. Never open the operator housing, touch the wiring, or force a gate against an engaged operator.

Move a released gate slowly, by hand, and only as far as you need. When the power returns, re-engage the operator as the manual describes before you rely on the remote again; the operator cannot move a gate that is still disconnected, and DASMA’s inspection procedure ends by reconnecting it. Hillside owners will find more on slopes in gates for steep and sloped driveways.

Should a gate open or stay locked when the power fails?

For many gates, the fire department answers this question. In the City of Los Angeles, the LAFD’s security gate standard applies where private streets, access roads, or fire lanes are required for fire department access. Power-operated gates there need an approved override device, and on a power failure, including battery back-up, the gates “shall automatically open, by spring tension or other non-electrical method,” or must be able to be pushed open without additional steps.

Statewide, the California Fire Code requires the fire code official’s approval for security gates across fire apparatus access roads, plus an approved means of emergency operation, with both kept operational at all times. Fire departments outside the City of Los Angeles set their own details, so ask yours; our fire access guide compares the City and County rules. Whether a gated private street or an apartment or commercial entrance is a required fire access route is the fire department’s determination; our apartment and HOA gate guide covers those properties.

For a private driveway that is not a required fire access route, settle the behavior with your installer, within any HOA rules. A gate that stays locked protects the property but can shut you in if the battery is flat; a gate that opens trades some security for a way out. Hillside homes and long driveways, where the gate may be the only vehicle exit, deserve extra thought.

Before the next outage: an owner checklist

1. 1Find the owner’s manual and keep it, or a photo of the release instructions, somewhere you can reach without going through the gate.
2. 2Get a demonstration of turning the power off and on, using the manual release, and resetting the operator. DASMA’s gate safety brochure lists all three as things an owner should learn.
3. 3Know your setup: whether there is battery backup, which controls it powers, and whether the gate is set to keep running, open, or stay closed when the power fails.
4. 4Store the release key, if your operator uses one, where you can reach it from either side of the gate, not only on a key ring in a car parked behind it.
5. 5Have the backup tested at routine service, and replace batteries before they fail rather than after.
6. 6Keep the gate moving freely. A sagging or binding leaf is harder, and less safe, to move by hand; DASMA’s brochure tells owners to check that the gate is level and travels smoothly.
7. 7Ask about surge protection for the operator and any call box; DASMA’s installation guidance for telephone entry systems calls for external surge suppression.
8. 8Know your other way in and out, such as a pedestrian gate with its own key, and keep any solar panel clear of new shade.
9. 9Property managers: confirm the fire-department override works and that the gate’s power-failure behavior meets your fire department’s requirements; the Fire Code requires emergency operation to be kept working at all times.

After the power returns: why some gates stay dead

If the gate doesn’t come back with the lights, work through these from outside the gate’s path:

• Is the operator getting power? A tripped breaker or GFCI is the simplest cause. Reset it once; if it trips again, leave it off and call, because repeated tripping points to a fault.
• Is the gate still on manual release? Re-engage it as the manual describes; until then, the operator can’t move the gate.
• Is it waiting for a reset? When an operator’s built-in sensing detects two obstructions in a row, UL 325 requires it to stop, sound an alarm, and wait for a deliberate command from a wired control. Your manual also lists any step your model needs after a power loss. If either step is inside the operator housing, leave it to a technician.
• Did the backup run flat? A battery drained by a long outage may not be ready for the next one, so have it checked rather than assuming it recovered.
• Did a surge damage something? Power events can damage gate electronics, which is why industry installation guidance calls for surge suppression. A dead operator with power restored points to the control board, power supply, battery, or charger: inside the housing, and a job for a technician.

The outage section of our troubleshooting guide goes further, and gate repair is the next step if the operator is still silent.

What SB 969 does, and doesn’t, cover

SB 969 (Dodd) was approved by the Governor and filed with the Secretary of State on September 21, 2018, as Chapter 621 of the Statutes of 2018. It added Section 19892 to the California Health and Safety Code and amended Section 19891.

Section 19892 says that on or after July 1, 2019, no one may manufacture for sale in California, sell, offer for sale, or install a residential automatic garage door opener without a battery backup function designed to operate during an electrical outage, one that keeps the opener “operational without interruption during an electrical outage.” It also bars connecting a replacement residential garage door to an existing opener that doesn’t meet that requirement. Under Section 19891, violations carry a civil penalty of $1,000 per opener.

The definitions settle the gate question. Section 19892 sits in the Health and Safety Code chapter on automatic garage door openers. That chapter defines a garage door as an overhead, vertical-moving barrier to the automobile entrance of a garage, and says the term excludes “structures that operate in a sliding or horizontal motion.” A garage is an enclosed, covered shelter for cars, not an unenclosed parking area or carport. A driveway gate that swings or slides across a driveway is neither, and the statute does not mention gates.

This is a plain-language reading of the statute, not legal advice. If someone tells you SB 969 requires battery backup on a driveway gate, ask which section says so; the text we read covers residential garage door openers.

Replacing a garage door opener, or a garage door that connects to an older opener, is different: that is exactly what Section 19892 covers. See garage door opener installation.

What does apply to automatic gates is the operator and construction standards in our UL 325 and ASTM F2200 guide and, on required fire access routes, the fire department’s emergency-operation rules above. Battery backup on a driveway gate is still worth weighing, but SB 969 doesn’t require it.

Solar and DC gates in an outage

A solar gate operator runs from batteries that a panel recharges, so a utility outage doesn’t cut it off. What limits it is the sun the panel has had, the condition of the batteries, and how often the gate cycles. A run of cloudy days, a panel shaded by growth since installation, or aging batteries tend to show up as slow cycles, or a gate that opens but won’t close. UL 325’s scope explicitly covers battery-powered operators and operators with battery back-up systems, so look for the same listing mark on a solar or DC operator as on any other.

A DC operator with battery backup keeps running from its batteries when utility power fails, until they are depleted. Either way, battery life is finite; if yours keeps dying, see the battery section of the troubleshooting guide.

When to call

• A car or person is stuck and the release won’t work, or the gate isn’t safe to release.
• The gate is off its track or hinges, leaning, or moved on its own once released.
• Power is back but the operator is silent, or its breaker or GFCI trips again.
• An alarm won’t clear, or the reset is inside the operator.
• The backup didn’t carry the gate through the outage.
• A fire-department override or fail-safe opening didn’t work.