Re:Over engineering my homelab so I don't pay cloud providers
by cyberax on Friday August 08, 2025 @02:12PM
(#44839940)
It's a bit trickier than you think. And can be dangerous.
The discharging circuitry is fine, but the _charger_ might overheat because a larger battery can draw more current while charging for longer periods. I discovered that when I tried to attach a "lead-acid compatible" LFP battery to an UPS.
These days, it's just easier to buy a dedicated rack-mountable LFP battery originally meant for solar installations, an inverter/charger controller, and a rectifier. The rectifier output will serve as a "solar panel" input for the battery. You get a double-conversion UPS with days-long holdover time for a fraction of a lead-acid UPS.
The discharging circuitry is fine, but the _charger_ might overheat because a larger battery can draw more current while charging for longer periods. I discovered that when I tried to attach a "lead-acid compatible" LFP battery to an UPS.
These days, it's just easier to buy a dedicated rack-mountable LFP battery originally meant for solar installations, an inverter/charger controller, and a rectifier. The rectifier output will serve as a "solar panel" input for the battery. You get a double-conversion UPS with days-long holdover time for a fraction of a lead-acid UPS.