To understand my need for these projects, there are some basics to be aware of. I have a 500Mbit symmetrical fibre feed into my house, which is rather stable at all times. The fibre router (which is supplied and owned by my provider) is only used as a gateway, all WiFi settings, etc, are switched off. There is a 9U wall-mount cabinet in my house (and one in my office). The fibre router is connected to the WAN port of a MikroTik RB2011-UiAS-RM router. There is another one in my office cabinet, and they are connected via aerial fibre.
I am in the process of providing 12V battery power supply to core equipment. The company I work for decided to host 2 nuc boxes here, and supplied me with a 200Ah LiFePO4 battery and a 10A charger, with the agreement that I am allowed to run my own equipment (in the office) off the same supply.
The office cabinet supply was built in a non-functioning DC-DC "mini UPS", since the case already contains 3 female DC jacks. It is currently in use.
The home cabinet supply is currently being build in the chassis of a TP-Link TL-SG1016D 16-port rack-mount switch that stopped working.
Built using a broken UPS that I received from a friend. Basically 3 power sockets on relays, and 12V, 5V, 3V3 and variable power supplies.
A network of various ESP controllers (including ESP32, ESP8266, ESP32-S2) that is the core of my home automation project.