Last month I walked into my home office and heard the buzzing of a UPS. After switching it out with another smaller UPS, I wiped off the dust and found the model number on the bottom to be: BE550G. These older UPS models are no longer even supported by APC anymore. After doing a search online, I found BatteryPlus.com had a replacement battery and they have a store nearby. I ordered the Duracell Ultra 12V 9AH High Rate AGM SLA Battery with F2 Terminals [SLAHR12-9FR] and then picked it up the same day. After letting the battery charge overnight, I had to hook the UPS up to my Windows machine to set the Battery Date using the PowerChute software. For some reason this is not possible on other operating systems and open source software that I could find. Once I had this done, I moved the UPS over to my pfSense firewall and connected it directly to one of the USB ports on the firewall.
There are a couple of different packages for pfSense that you can install. pfSense is FreeBSD based, so you can install the software natively or use the pfSense packages to install. Once you configure the setup, the packages offer dashboard widgets that you can add to the pfSense dashboard. Here is what each one looks like.
Developed for only APC UPS units, apcusd features a better looking widget.
Network UPS Tools
Known as the NUT package, this open source software has a more simplistic dashboard, however Network UPS Tools supports more devices and has extensive features for UPS units directly connected or on the network.
Setting up either package requires reading the setup documentation online. I was able to run both packages for a direct USB connected device.
For apcupsd set UPS Cable and UPS Type to “USB” and leave the Device field blank. If you are using NUT, set the UPS Type to Local USB and driver to usbhid.
Overall I am glad that I could salvage the UPS and keep it in service. This keeps perfectly good equipment working and prevents waste. The plus, is that my firewall and internet connection will run a bit longer and not reset during a power spike.