if configured to, creates POWERDOWNFLAG file.upsmon master waits up to HOSTSYNC seconds for all salves to disconnect from upsd and then regardless of any remaining connections, upsmon stops waiting and proceeds with shutdown process.upsmon slave systems notice the FSD flag and.upsmon master sets forced shutdown (ups.status = FSD OB LB) flag to inform all slave systems that it will soon power down the load (if there are no slaves, skip to step 6).some time passes and UPS eventually reaches a low battery condition (ups.status = OB LB).Power fails and UPS goes on battery (ups.status = OB).Its worth understanding how a NUT shutdown is managed. AP9335TH APC Temperature & Humidity Sensor.AP9631 UPS Network Management Card 2 with Environmental Monitoring.SMX48RMBP2U battery modules to provide adequate runtime requirements.Additional 5PXEBM48RT battery modules to provide adequate runtime requirements.Eaton Network Card-MS ethernet and environmental monitoring card.I’ve had good success with the following APC and Eaton units over several years now. A number of solutions take regular 12v, 9AH batteries which can be obtained cheaply and replaced fairly easily.Ĭheck compatibility on the NUT hardware compatibility list to verify they are supported by NUT. Most manufacturers will sell you a complete battery sled but they are usually expensive. If you desire the ability to monitor the local temperature and humidity, make sure your communication card has inputs for the environmental sensors. Verify your intended UPS comes with a network port or one can be installed. My preference is for a network connection which I’ve found more robust than USB connections. Given the importance of a battery backup for the reasons outlined earlier, we need to provide a communication mechanism capable of 24x7 reliable operation. Daisy-chaining extension cords isn’t advisable. Verify theres enough output receptacles of the right type for your needs. UPS’ with 1500 VA and below typically plug into a standard wall socket. Verify the UPS’ power plug is suitable for you home, some larger models come with connections that require higher capacity circuits and it may be expensive to have your home or office wired for them. My preference is for UPS’ that offer the ability to daisy-chain additional battery unit that enable you to easily extend your UPS system if your needs change. For example a UPS rated at 1000 VA / 900 watts provides 33% more power than one rated at 1000 VA / 600 watts. Watts measures real power and is the key rating. UPSs are typically rated in volt-amperes (VA) and watts. There are many manufacturers of UPS systems, the following details the criteria I used to determine which models would suit my needs.Įnsure input and output voltages are as per your requirements, USA being primarily 110v and Europe being 240v. This aim of this guide is to provide some recommendations for hardware, connectivity and configuration of pfSense’s NUT package to provide a central server capable of managing a number of connected devices and servers. Adding a Uninterruptible Power Supply (UPS) to your network guards against these kind of events. Hosting ZFS file servers and virtualisation systems such as ESXi or Proxmox requires some precautions against less than perfect electrical supplies where brown or black outs can cause cause unexpected down time or worse, data corruption and loss. UPS management with NUT Last revised 14 September 2018.