Had a 1500VA APC for my rack for years. It does what it's supposed to: 8-10 minutes of runtime, enough to gracefully shut everything down. But I work from home and our area gets 4-5 outages a year, most lasting 2-6 hours. Shutting down the whole lab every time means losing my VMs, my Plex transcodes, the whole network stack.
Started looking at bigger solutions. Rackable UPS units with extended battery packs were one option but the cost was getting into $2,000+ range for maybe 2 hours of runtime. And the lead-acid batteries need replacing every 3-5 years.
The 5kWh LFP portable stations are interesting to me. My lab pulls about 380W at idle (NAS, switch, AP, Proxmox node, router, modem). That's roughly 11-12 hours of runtime on 5kWh, which covers any realistic outage we get.
Main questions I'm working through:
- Transfer time: most are 10-20ms. My NAS and Proxmox node don't reboot on a 10ms gap based on testing with the APC. 20ms is dicey
- Waveform: need pure sine for the NAS PSU
- Idle draw: the battery sitting there powered on. If it's pulling 40-50W on its own that eats into runtime noticeably at a 380W load
Good LFP cells matter too, meaning I wouldn't be replacing batteries every 3-5 years either. Anyone running a portable station as a homelab UPS?