Storm season and summer grid stress make this a fair question. The reassuring answer for Denler-style locks: the lock on your door runs from its own battery, not from a 240 V strike tied to house power.
What keeps working in a blackout
- Fingerprint and face recognition (device-side)
- PIN / keypad entry
- RFID cards
- Mechanical key override
- RF remotes where the model includes them
If the lock has charge, you can get in and out the same way you did yesterday.
What may not work without power or internet
- Cloud-dependent remote unlock from interstate if your home internet is down
- Live video that needs the lock’s WiFi path to a router without backup power
- Alexa / Google voice unlock that depends on assistants and network
Your phone can still open some app features over mobile data if the lock’s own connection path is intact — but a router without UPS will drop WiFi features until power returns.
Battery vs blackout — do not confuse them
An empty lock battery is a different problem from a street outage. Keep the pack charged and learn the low-battery alerts. See Smart lock battery life explained.
Dual batteries and planning
Models with dual rechargeable packs (L04v2, FLv7 CNC Slim) give more buffer for busy doors. Still treat the mechanical key as sacred — know where it is before you need it.
Perth practicalities
If you run medical equipment or work from home with a UPS on the router, your smart lock’s app features may survive a short outage longer than the neighbour’s. The deadbolt itself did not need that UPS.
Choose with clear eyes
Remote unlock is a convenience layer, not the only way in. When you browse the shop or enquire, tell us if offline reliability or voice-assistant tricks matter more — we will point you at the right Denler tier and book installation across Perth metro.