KiCad boards from 2 GitHub repositories tagged “12v”, the most starred first; open any of them in PCBKit.
wkcollis1-eng/DIY-LiFePO4-UPS
12V LiFePO4 UPS for Home Assistant and network gear. First full outage validation (May 6, 2026): 217 min AC-off, 4.18 Ah / 53.3 Wh delivered, graceful shutdown via slope-based cliff_imminent trigger — confirmed…
mlab-modules/ISO11446PWR01
Car trailer emulator for use trailer socket as a power source
wkcollis1-eng/DIY-LiFePO4-UPS
12V LiFePO4 UPS for Home Assistant and network gear. First full outage validation (May 6, 2026): 217 min AC-off, 4.18 Ah / 53.3 Wh delivered, graceful shutdown via slope-based cliff_imminent trigger — confirmed…