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Best Alarm for a Static Caravan with No Mains Power
A static caravan without mains power needs an alarm that runs entirely on batteries and asks nothing of the site’s electrics. The five picks below cover three jobs: detecting intruders, warning that the power has dropped, and confirming when it returns. They suit weekend owners who leave a van unattended for weeks, owners running on a generator or leisure battery, and anyone who wants a loud siren without an electrician. The overview table below shows each pick at a glance.
Overview of the Picks
| Product | Key Spec | Best Use | Price Tier |
|---|---|---|---|
| 0-110dB Power Loss Alarm Monitor | 110dB, 7 sirens, 12H alert | Power failure monitoring | Budget |
| TECKNET 40ft PIR Motion Sensor Alarm | 125dB, 40ft detection, 328ft remote | Off-grid intruder alert | Mid-range |
| WiFi Alarm System SetD | 120dB, weatherproof, WiFi | Remote monitoring of shed and driveway | Premium |
| CPVAN CP2 Pro Motion Sensor Alarm | 125dB, 40ft detection, battery operated | Simple indoor motion alarm | Budget |
| Briidea Power Return Alarm | Loud siren, LED indicator | Generator and power-return alert | Budget |
1. 0-110dB Power Loss Alarm Monitor
Type: Power failure alarm
Alarm volume: 0-110dB adjustable
Alert duration: 12H
Sirens: 7
Indicator: LED
Power source: Battery
0-110dB Adjustable, LED Indicator, 12H Alert, Power Loss Alarm Monitor
This monitor watches the supply rather than the room. It sounds when power drops and keeps alerting for up to 12 hours, with seven different siren tones and an adjustable volume that can be turned right down or pushed to full 110dB. The LED indicator gives a visual status check without triggering the siren. It is a compact plug-in-style unit built for fridges, freezers, sump pumps and aquariums, and the same logic applies to a caravan supply fed from a generator or hook-up.
It suits the owner whose real worry is a dead leisure battery or a tripped supply that quietly ruins a fridge full of food. The adjustable volume is the smart part: a full 110dB inside a small van is punishing, so the dial can be set to something survivable. It is not a security device, and anyone expecting it to detect a person will be disappointed. The trade-off is that it monitors one supply point only and says nothing about movement inside the van.
Trade-off: The siren is genuinely loud at full setting, and in a confined caravan that becomes unpleasant fast — plan on a lower volume.
2. TECKNET 40ft PIR Motion Sensor Alarm
Type: Wireless PIR motion sensor alarm
Alarm volume: 125dB
Detection range: 40ft
Remote range: 328ft
Power source: Battery
Mounting: Indoor
This is a self-contained intruder alarm: a passive infrared detector and a 125dB siren in one battery-powered housing, with no hub, no wiring and no app. The 40ft detection range covers the inside of most caravans and the 328ft remote lets the system be armed or disarmed from well outside the van. Mounting is a screw-and-bracket job on a wall or ceiling, and the whole unit runs on batteries.
It suits the owner who wants protection during the months the van sits empty and does not want to depend on site power. Because nothing is wired in, it can be fitted in an afternoon and moved if the layout changes. The limitation is that it is an indoor unit, so it belongs inside the van rather than on the decking. The trade-off is that a PIR sensor reacts to warm moving bodies, which means pets left inside will set it off.
Trade-off: The detector cannot tell a person from a warm-bodied pet, so animals left in the van will trigger the siren.
3. WiFi Alarm System SetD
Type: WiFi alarm system with siren and motion sensor
Alarm volume: 120dB
Connectivity: WiFi
Included: Motion sensor, remote control
Weatherproof: Yes
Intended use: House, apartment, shed, garage, driveway
This set bundles a 120dB siren, a motion sensor and a remote control into one WiFi-linked package, and the weatherproof rating is what separates it from the rest of the list. That rating means the siren can live outside on the van’s exterior or on a storage box, where it is far more useful than a siren muffled by closed windows. The remote handles everyday arming, and the WiFi link allows status checks and alerts from a phone.
It suits the owner who wants to know what is happening at the van while away, and who has some way of keeping a router or hotspot powered on site. The motion sensor covers the interior while the siren can sit outside, which is a sensible split for a caravan. The trade-off is dependence: without a live WiFi connection the smart features go quiet, and the siren alone is all that remains.
Trade-off: The app and alert features need a working WiFi network at the van, which is exactly what an off-grid pitch may not have.
4. CPVAN CP2 Pro Motion Sensor Alarm
Type: Wireless PIR motion sensor alarm
Alarm volume: 125dB
Detection range: 40ft
Remote range: 328ft
Power source: Battery operated
Colour: White
The CP2 Pro is the straightforward option: a white indoor PIR detector with a built-in 125dB siren, a 40ft detection range and a 328ft remote for arming and disarming. It runs on batteries, needs no hub and no internet, and mounts on a wall or ceiling with basic fixings. The white housing blends into a caravan interior better than a dark unit would.
It suits the owner who wants a dependable motion alarm with the least possible setup and no ongoing subscriptions. There is nothing to configure and nothing to connect, which is precisely the appeal on a site with no mains power. It is an indoor-only device, so it protects the inside of the van rather than the pitch around it. The trade-off is that it is a single detector with no expansion path — covering a second room or an awning means buying another complete unit.
Trade-off: One detector covers one zone, and there is no way to link several into a single system.
5. Briidea Power Return Alarm
Type: Power return alert
Alarm: Loud siren
Indicator: LED
Intended use: Generator and utility power monitoring
Power Return Alarm, Briidea Utility Power Back on Alert for Generator, Loud Siren with LED Indicator
This is the mirror image of the first pick: it alerts when power comes back rather than when it fails. A loud siren and an LED indicator tell the owner that the generator has kicked in or the hook-up has been restored, which matters when a van is running on a charged battery bank and every hour of mains power counts. The unit is small, simple and built for utility and generator monitoring.
It suits the owner who manages power deliberately — someone who switches the supply off overnight and wants a clear signal when it returns, or who runs a generator and needs to know the moment it stabilises. The LED gives a quiet visual confirmation for anyone on site. It is not a security product and does nothing about intruders. The trade-off is its narrow job: it answers one question, and a van that also needs intrusion cover requires a second device.
Trade-off: It only reports the return of power, so it is a companion to a security alarm rather than a replacement for one.
Before You Buy
- Power source: Every pick here runs on batteries or the monitored supply, so check the battery type and buy spares before the season starts.
- Detection range: A 40ft PIR range covers most caravan interiors, but a long van with a dividing door may need two units or careful placement.
- Indoor vs weatherproof: Only the WiFi set is rated weatherproof; the others belong inside the van and will not survive an exposed pitch.
- Connectivity: Smart features need a live WiFi network at the van — confirm one exists before paying for app-based alerts.
- Pets: PIR sensors react to warm moving bodies, so a van that houses animals needs the sensor positioned to avoid their usual routes.
- Mounting: Most units fix with screws, so check what the caravan’s internal walls will take without a drill.
- Alert type: Decide up front whether the priority is intrusion, power loss or power return — the three jobs use different devices.
Frequently Asked Questions
-
Can a caravan alarm work with no mains power at all?
Yes. Every pick on this list runs from its own batteries or monitors a supply directly, so none of them needs a mains feed to operate. -
How long will batteries last in a caravan alarm?
That depends on the unit and how often it triggers. A PIR alarm sitting armed and undisturbed draws very little, while frequent false triggers from pets or draughts will drain it faster. -
Will a motion alarm work in an unheated van through winter?
Battery performance drops in cold conditions, so a van left unheated over winter needs fresh batteries before the season and a check partway through. -
Do these alarms need a subscription or a phone signal?
Only the WiFi set uses an app, and that needs a network rather than a subscription. The PIR alarms and both power monitors work entirely offline. -
What is the difference between a power loss alarm and a power return alarm?
A power loss alarm sounds when the supply fails; a power return alarm sounds when it comes back. A van running on a generator or battery bank often benefits from both. -
Can one alarm cover the van and an awning or shed?
Only if the unit is weatherproof and placed outside. The indoor PIR models cover the interior only, and the WiFi set’s weatherproof siren is the one pick suited to an exterior position.
Bottom Line
For most static caravans with no mains power, the TECKNET 40ft PIR Motion Sensor Alarm is the pick that earns its place: a 125dB siren, a 40ft detection range and a 328ft remote, all from batteries with no hub and no internet. Owners whose main worry is the supply rather than intruders should pair it with the 0-110dB Power Loss Alarm Monitor, and anyone with a live WiFi network at the van can step up to the weatherproof WiFi Alarm System SetD for outside coverage and phone alerts.
