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2. January 2025 Richmond water crisis - Wikipedia

   en.wikipedia.org/wiki/January_2025_Richmond...

   The system had battery backup power, but, concurrently with the manual switch to the power system, that went offline before full power was restored. [24] An RVAMag report said that the IT battery backup system ran out too quickly, [11] after about an hour into the two-hour power loss. [26]

3. Backup battery - Wikipedia

   en.wikipedia.org/wiki/Backup_battery

   A backup battery provides power to a system when the primary source of power is unavailable. Backup batteries range from small single cells to retain clock time and date in computers, up to large battery room facilities that power uninterruptible power supply systems for large data centers. Small backup batteries may be primary cells ...

4. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   It is common for the autotransformer to cover a range only from about 90 V to 140 V for 120 V power, and then switch to battery if the voltage goes much higher or lower than that range. In low-voltage conditions the UPS will use more current than normal, so it may need a higher current circuit than a normal device.

5. Switched-mode power supply - Wikipedia

   en.wikipedia.org/wiki/Switched-mode_power_supply

   Comparison of a linear power supply and a switched-mode power supply Linear power supply Switching power supply Notes Size and weight: 0.12 W/cm 3, 88 W/kg [28] Smaller than linear power supply. Compared to linear, a SMPS that is 20 kHz is 1/4, 100–200 kHz is 1/8, and 200 kHz–1 MHz types can be even smaller. [28]: 5–8

6. Emergency power system - Wikipedia

   en.wikipedia.org/wiki/Emergency_power_system

   For a 208 VAC emergency supply system, a central battery system with automatic controls, located in the power station building, is used to avoid long electric supply wires. This central battery system consists of lead-acid battery cell units to make up a 12 or 24 VDC system as well as stand-by cells, each with its own battery charging unit.

7. AOL Mail

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