Bali runs on PLN, and PLN goes down — a few minutes most weeks, an hour or two during the rainy season, occasionally half a day after a storm. We have installed across Canggu, Seminyak and Ubud for seven years, and the single biggest difference between a smart home that owners trust and one they quietly abandon is what happens at second zero of a blackout. Here is exactly how we keep automation, security and access alive when the grid is not.
Why Most Smart Homes Fail During a Bali Blackout
The failure is almost never the smart devices themselves — it is the chain they depend on. A cloud-based gadget needs three things to respond: mains power, the WiFi router, and the internet uplink to a server overseas. A blackout kills all three at once. Your "smart" lights, locks and cameras go dark not because they broke, but because every link above them did. The fix is not a bigger gadget budget; it is designing the system so the critical layer keeps running on a tiny amount of battery while the rest waits politely for power to return.
The Three Things That Must Stay On
The hub
A local Zigbee or Matter hub draws only a couple of watts. On a small UPS it runs for hours, which means your automations — the logic of the house — never stop thinking. Lights you press still respond, schedules still fire, sensors still report.
The network core
Router plus the main access point. Without these, nothing talks to anything and you lose remote access entirely. They are also low-draw and belong on the same UPS as the hub.
Security and access
Cameras recording to a local NVR, and the smart locks guests depend on. A guest arriving to a dead lock at midnight is the failure that ends a rental's reviews. Locks have their own internal batteries; the recording and the gate controller need backup.
What This Costs in IDR
| Backup layer | What it protects | Typical cost |
|---|---|---|
| Small UPS (hub + router) | Automations, WiFi, remote access | IDR 1,200,000 – 2,500,000 |
| NVR + camera UPS | Continuous recording through outages | IDR 1,500,000 – 3,000,000 |
| Inverter + battery (whole-room) | Lights, fans, fridge for hours | IDR 12,000,000 – 35,000,000 |
You do not need the whole-room inverter for a smart home to survive a blackout — the first two rows are what matter for automation and security. The inverter is a comfort upgrade, not a requirement, and we size it only when an owner specifically wants the villa to feel "on" through a long outage.
Local Control Is the Real Backup
Hardware backup is only half the answer. The other half is architecture: a system that controls devices locally rather than bouncing every command to a cloud server. When your hub talks directly to your lights over Zigbee, a wall switch press works even with the internet completely gone — only remote access from outside the villa needs the uplink. This is why we build around local-first platforms and avoid cloud-only gadgets, and it is the same reasoning behind our brand choices for Bali. A well-designed local system plus a IDR 1.5M UPS beats a cloud-dependent system on a IDR 30M inverter, every single time.
How We Set It Up
On every full installation we put the hub and network core on a UPS as standard, record security cameras locally, and test the villa by literally cutting the main breaker and watching what survives. If something we promised would stay on goes dark, it gets fixed before handover. That blackout test is non-negotiable — it is the only honest way to prove the backup works. For rental owners, this protection is the difference between a 4.9 and a string of one-star "couldn't get in" reviews; we cover the economics in our rental villa guide.