UPS power distribution soldering
At home I have an APC Back-UPS CS500 UPS (BK500) to ensure my systems have just enough time to power down gracefully when a poweroutage occurs (or keep working until the battery runs out). It includes a USB cable which you can connect to a machine (works perfectly with apcupsd) so the Operating System knows that the power is gone and you are running on battery power.
Bug
A few weeks ago I heard an unknown beep when I got coffee. Being curious I followed the sound and it was the UPS. We had bad weather and it included lightning. I didn't notice the power outage yet, because only 1 power group was out and it was the one connected to the UPS. I reset the power breaker and everything was good.
Sitting behind my desk again, I noticed my Raspberry Pi's were rebooted, so my irssi instance was gone. It is not a big deal, just annoying. So next time a power outage happens, I want the Pi's to power down gracefully as well.
Solution
The challenge is that the UPS has IEC 60 320 C14 (C14 is female) connectors and Raspberry Pi's need 5V of power. Since I don't want to lose flexibility, but want a cheap solution, I thought of a simple solution. Cut open a normal C14-C13 cable, cut open a power strip and wire the C14 plug and the powerstrip together. That way, I can use normal (and already owned) 220V to 5V adapters and have multiple normal 220V power sockets available. A little time, some soldering and a bit of insulating tape later, it was done. Profit :)
Result
Powercables insulated
Powercables shrink tubed
Happy Pi with the powerstrip in the background