To make your phone know at once when a freezer or cold room loses power, install a power outage alarm on the refrigeration unit's power circuit. Choose the NB-IoT or 4G version with a built-in SIM card, because the Wi-Fi router goes down in a power cut too and the alarm cannot get out.
What a freezer fears most is not the power cut itself, but a power cut that nobody knows about. A trip in the middle of the night, a typhoon outage or a compressor switch that has tripped, and when the door is opened the next morning the whole room has thawed, and a whole batch of goods is lost. This article explains how to set up power outage notification for freezers, cold rooms and commercial fridges, how Wi-Fi types differ from built-in SIM card types, and what to do after a power outage.
Why Are Wi-Fi Freezer Power Outage Alarms Often Useless?
Many people buy a Wi-Fi thermometer or a Wi-Fi plug-type power failure detector and expect the phone to ring in an outage. In reality, in a wide-area power cut:
- The Wi-Fi router and modem in the shop or warehouse are also without power, so even if the alarm has a battery, it has no network to send the notification through.
- The phone only receives the "just disconnected" message after power returns and the network recovers, by which time several hours may have passed.
So in places like freezers and cold rooms, where a few hours without power means losses, the alarm must be able to get online by itself: built-in battery plus built-in SIM card, so it can still send notifications over the mobile network during an outage.
| Type | How notifications are sent | In a wide-area power cut | Suitable |
|---|---|---|---|
| Wi-Fi thermometer, Wi-Fi plug-type detector | Goes through the on-site Wi-Fi router | If the router has no power, nothing can be sent | Home fridges, places where a UPS keeps the network running |
| Temperature data logger (not connected) | Does not notify actively; records are read afterwards | You find out only afterwards | Quality control records, temperature log sheets |
| Power outage alarm with built-in SIM card (NB-IoT/4G) | Uses the telecom mobile network directly | The module has a battery and its own communication, so it can still send an alarm | Freezers, cold rooms, commercial fridges, cold chain warehouses |
All versions of YenProtek's Power Outage Alert Module have a built-in battery. The NB-IoT and 4G versions have a built-in SIM card and still send alarms in an outage. For the Wi-Fi version, it depends on whether the on-site router and modem still have power after an outage.
How Do You Set Up Freezer Power Outage Notification?
The Power Outage Alert Module is a power monitoring module developed in-house by YenProtek and added to the power supply line of existing equipment. For freezers and cold rooms:
- No need to replace your refrigeration equipment: the module is connected in parallel to the power supply line of the refrigeration unit or cold room equipment, and the equipment works as before.
- One module covers 4 circuits: it can monitor up to 4 equipment circuits and supports AC 110V/220V. Connect one circuit to each refrigeration unit, and you can tell at a glance which one has stopped.
- 3 kinds of faults are notified: power cut, voltage sag and abnormal current. It catches not only a whole-area outage but also a tripped switch on a single unit.
- Notification methods: LINE, SMS, email and voice call, to several people at once. You can also set escalation: if the first person does not respond, the next person is notified in turn. In a middle-of-the-night outage, a voice call is less likely to be missed than a phone push notification.
- No data lost when the signal is weak: when the connection drops, data is stored temporarily and sent once the signal returns.
How Long Can a Freezer Last in a Power Outage?
The US Food and Drug Administration (FDA) gives advice for ordinary households in a power outage: a fridge keeps food cold for about 4 hours if the door is not opened; a full freezer holds its temperature for about 48 hours, and a half-full one about 24 hours; keep the door closed as much as possible.
The insulation, load and door-opening frequency of commercial freezers and large cold rooms all differ, so these times cannot be applied directly, but the principle is the same: the earlier you know, the more time you have to decide whether to start a generator, move goods or get someone to deal with it. After a power cut, the most important things are:
- First confirm whether it is a wide-area outage or your own unit has tripped (the Power Outage Alert Module tells you which circuit has stopped).
- Keep the door closed as much as possible to hold the cold inside.
- Estimate how long the outage will last: if it is long, arrange a generator or move the goods to another freezer.
- After power returns, check that the unit has restarted, because some equipment does not restart by itself.
Where Is a Freezer Power Outage Alert Most Needed?
Commercial fridges and freezers in restaurants, bubble tea shops and lunch box shops
With nobody in the shop after closing, a trip in the middle of the night is found only when the shop opens the next day, and all the food has to be thrown away.
Agricultural produce and seafood cold rooms
Pre-cooling of farm produce, cold storage for fruit and vegetables, and frozen seafood: one room of goods can be a season's income. Cold rooms are often at the production site or by the harbor, and the owner may not live nearby.
Cold chain warehouses and fresh food e-commerce
With many rooms and many units, one module covers 4 circuits, and the person in charge is notified directly when a unit stops.
Medicine, vaccine and specimen refrigerators
Where temperature is more critical, besides power outage notification you usually also need temperature records that meet the relevant standards. If you want temperature monitoring as well, please discuss your needs with us first.
Should You Also Monitor Freezer Temperature?
A power outage alarm tells you whether the power is still on, and temperature monitoring tells you how cold the room is right now. The two watch different things:
- Power cut, unit tripped: the power outage alarm knows right away, when the room temperature has not yet risen, so you have the most time to respond.
- Unit is powered but not cooling (low refrigerant, door not closed, abnormal defrost): only temperature monitoring can show this.
If your freezer also needs continuous temperature records and temperature alerts, tell us the type of room and the required temperature range, and we will confirm a suitable setup.
4 Things to Check Before You Buy
1. Is there mobile signal at the freezer location?
The metal walls of freezers and cold rooms block signal. The module is mounted near the power box outside the room, so before installing, take your phone to the planned spot and check the signal. If you are not sure, tell us the location and we will check together.
2. How many units to cover?
One module monitors up to 4 circuits. List the number of freezers, cold rooms and commercial fridges to see how many modules you need.
3. What power does the equipment use?
The module supports AC 110V/220V. For three-phase or large refrigeration units, tell us the power distribution first. Once the wiring is confirmed, a qualified electrician carries out the installation.
4. Who should be notified?
Include people on duty and standby, and update the list when staff change. Set up escalation so that if the first person does not answer, the next person is notified.
How Much Does It Cost?
The cost depends mainly on how many circuits you need to cover (which decides the number of modules), which communication version you choose (NB-IoT and 4G versions have a data fee), and which notification methods you use. Taiwan prices are as shown in the online quote tool. You can go to the Power Outage Alert Module online quote, choose the communication version and notification methods, and submit. If you are not sure what to choose, feel free to contact us.
Frequently Asked Questions
Q1: If the power is out and the alarm has no power either, can it still notify me?
All versions of the YenProtek Power Outage Alert Module have a built-in battery, so the module still has power after the mains fails. To get the alarm out, choose the NB-IoT version or 4G version with a built-in SIM card, which does not depend on the site's network. For the Wi-Fi version, check whether your router and modem still have power after an outage.
Q2: Isn't a Wi-Fi thermometer enough for a freezer?
When a whole area loses power, the Wi-Fi router goes down too. Even a thermometer with a battery cannot send a notification, and you only get it when power returns. A freezer needs notification at the moment the power fails, so we recommend an alarm with a built-in SIM card.
Q3: If only one freezer unit trips, will I still be notified?
Yes. Each unit is connected to a separate circuit. A power cut, voltage sag or abnormal current on any one unit triggers a notification, and you know which unit it is.
Q4: Do I need to replace my existing freezer or fridge?
No. The module is added to the power supply line of the existing equipment, and the equipment works as before.
Q5: Can a generator start automatically when the power fails?
If the site's backup generator has a remote start interface, we can separately assess using a Smart Control Box to start it during an outage. The Smart Control Box only switches power on and off, and the generator changeover wiring is done by a qualified electrician through an external circuit.
Q6: Can I also see the freezer temperature?
The Power Outage Alert Module measures voltage and current. To add in-room temperature monitoring and temperature alerts, tell us the type of freezer and its temperature range first, and we will confirm a suitable setup.
Further Reading
- How to Choose a Power Outage Alarm: Wi-Fi vs NB-IoT vs 4G
- How to Choose Between Wi-Fi, LoRa, NB-IoT and 4G
- Flood and Power Outage Together: Who Will Notify You?
References
- U.S. Food and Drug Administration, Food and Water Safety During Power Outages and Floods.
