[int0x2e]

My smart home is also my home security solution, so I wanted it to work through a (short) power failure.

Getting a UPS for my Home Assistant node was the easy part. Like you, I was worried about the many nodes scattered throughout the house that needed power.

The solution I've come to for now is using a USB plug for mains power, that goes through a DIY USB battery bank charging board (that I got off AliExpress) that's plugged into an 18650 cell. Most of these boards can either charge or provide a 5v out, but some are happy to do both at the same time, and can act as a mini-UPS.