3 ms·
I'm giving some thought to brewing up my own UPS. Mostly for capacity, which is tough to get in a residential unit at any price, and quickly becomes expensive
by rootusrootus 4y ago
I'm giving some thought to brewing up my own UPS. Mostly for capacity, which is tough to get in a residential unit at any price, and quickly becomes expensive if you try. Technologically, it is not particularly difficult. You buy a halfway decent inverter/charger from a reputable manufacturer, and however much LiFePO4 capacity you want. I would not choose lithium ion; LFPs are considerably less likely to combust.
- Tempest1981 4y agoPlease post a parts list if you do!
- revanx_ 4y agoHow do you achieve the X <= 10 ms switching capacity? You need this if you actually want your equipment to survive the power outage. Also, I'm extremely sensitive to humm noise output by inverters so I can only tolerate UPSs that have that "Green mode" option which (I guess?) powers directly from AC when under quality power but still provides protection.
- jotm 4y agoCapacitors or using a circuit where the battery is always supplying power (can't remember what it's called). Could make a post-PSU UPS, then you don't need an inverter at all (also the most efficient design, no conversion losses)
- rootusrootus 4y agoMy preferred inverter/charger manufacturer, Victron, has "UPS Mode" for their Multiplus units that will switch in 12ms. That's similar to many UPS's, though some of the higher end ones are sub-10.
- voxadam 4y agoA few years ago ESR started on an open source/hardware UPS project called Upside.[0][1] I can't vouch for the design as I haven't looked at it in a long time. [0] http://esr.ibiblio.org/?p=7839 http://esr.ibiblio.org/?p=7839 [1] https://gitlab.com/esr/upside https://gitlab.com/esr/upside