A teardown of a 19″ 1U server UPS, the APC Smart UPS 450 model SC450RMI1U. I give a quick run down of the current paths in the system and evaluation of the overall design.
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Specifications for APC Smart UPS 450
Output
Max Configurable Power (Watts) 280 Watts / 450VA
Output Voltage Distortion Less than 5 % at full load
Output Frequency (sync to mains) 47 – 53 Hz For 50 Hz nominal Sync to mains, 57 – 63 Hz For 60 Hz nominal Sync to mains
Topology Line interactive
Waveform type Stepped approximation to a sinewave
Transfer Time 4 ms typical : 8 ms maximum
Input
Input frequency 50/60 Hz +/- 3 Hz Auto-sensing
Input voltage range for main operations 151 – 302 Adjustable, 195 – 265V
Batteries & Runtime
Battery type Lead-acid battery
Typical recharge time 5hour(s)
Nominal Battery Voltage 12 V
Replacement Battery RBC18
Expected Battery Life (years) 3 – 5
RBC Quantity 1
Battery Charge Power (Watts) 22 Watts
https://www.apc.com/shop/hr/en/products/APC-Smart-UPS-SC-450VA-230V-1U-Rackmount-Tower/P-SC450RMI1U