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Rectangular black UPS tower with six IEC outlets on the rear panel

APC

APC Back-UPS CS BK500EI 500VA 300W UPS

SKU CH-0J27-04Q19 MPN BK500EI

Provides 300 W battery backup and surge protection through six IEC outlets with RS-232 and USB monitoring

  • Voltage version230 V
  • AC input voltage180–266 V Adjustable range: 160–300 V
  • Input line frequency50/60 Hz +/- 3 Hz (auto sensing)
  • Power inputIEC-320-C14 inlet
  • Volt-ampere rating500 VA
  • Power rating300 W
  • Keeps equipment running during outages with 300 W battery backup
  • Protects six devices using three battery-backed and three surge-only IEC outlets
  • Accepts unstable mains from 160 V to 300 V without draining the battery
  • Connects via USB or RS-232 for automated shutdown software
  • User-replaceable RBC2 battery restores full runtime in eight hours

Professional power protection

The APC Back-UPS CS BK500EI is a 500 VA, 300 W battery backup unit designed for office and home office systems. It supplies battery powered and surge protected power to connected equipment during outages and voltage fluctuations. The unit operates on a 230 V international version with an input range of 180 to 266 V.

300 W load capacity

The 300 watt output rating is the single figure that decides whether this UPS can support your equipment. At full load the battery provides 2.40 minutes of runtime, enough for a controlled shutdown. The adjustable input range of 160 to 300 V widens the window before battery power is needed.

Six IEC outlets and connectivity

Three IEC 320 C13 outlets deliver battery backup while one C13 and two IEC jumpers provide surge only protection. An IEC 320 C14 inlet accepts the mains lead. RS 232 and USB ports enable management software for automatic shutdown. The user replaceable RBC2 battery cartridge is hot swappable for continuous operation.

How it compares

Measured against everything we stock in Uninterruptible Power Supplies (UPS), at today’s prices. Recalculated every night.

Price $114.99
Cheaper than about 89% of the 1,153 comparable items (median $948.99).

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Specifications

Product
Brand nameAPC
Product lineBack-UPS CS
Model nameBK500EI
Ports & slots
Communication portsRS-232, USB
Power
Voltage version230 V
AC input voltage180–266 V
Adjustable range: 160–300 V
Input line frequency50/60 Hz +/- 3 Hz (auto sensing)
Power inputIEC-320-C14 inlet
Volt-ampere rating500 VA
Power rating300 W
Voltage output230 V
AC output frequency47–63 Hz
Power outlets6
Battery charge time8 hour(s)
Replacement batteryRBC2, RBC2J
AlertsAlarm when on battery: distinctive low battery alarm: overload continuous tone alarm
Surge protection rating310 Joules
Size & build
Product dimensions6.5 in × 3.58 in × 11.18 in (H × W × D)
Product weight13.93 lb (6.32 kg)
Shipping weight6.35 kg
Package size457 × 406 × 356 mm
In the box
In the box90486L

Questions about this item

How long will the 300 W rating actually run my equipment during a blackout?

At full 300 W load the unit provides about 2.40 minutes of runtime; lighter loads will extend that time.

What do the RS-232 and USB ports let me do in practice?

They connect to management software for safe shutdown and monitoring; only one port can be used at a time.

What space and mounting clearance does the unit need?

It measures 6.50 inches high, 3.58 inches wide and 11.18 inches deep, so allow at least that footprint on a flat surface.

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