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For a weekend project I built a 12V UPS that can power 35W for around 2h. There is a boost converter in line that brings it up to 48V for PoE cameras and other devices while the NVR and the mini PC sip 12V directly.
For a weekend project I built a 12V UPS that can power 35W for around 2h. There is a boost converter in line that brings it up to 48V for PoE cameras and other devices while the NVR and the mini PC sip 12V directly.