The APC Back-UPS BK500EI is a reliable standby UPS designed to protect your home or small office electronics from power outages, surges, and spikes. Offering a power capacity of 500VA/300W, this tower UPS delivers clean and consistent 230V output voltage with a stepped approximation to a sine wave, ensuring safe power delivery to connected devices.

Equipped with 4 IEC C13 outlets (typically 3 battery backup and 1 surge-only), it facilitates convenient connectivity for multiple devices. Its user-replaceable, maintenance-free sealed lead-acid battery (model RBC2) guarantees long service life and easy replacement, helping maintain uptime during extended power interruptions.

With a compact footprint of 165 x 91 x 284 mm and weighing approximately 6.32kg, the BK500EI fits well in various environments. It features an adjustable input voltage range (160-300 V), an IEC 60320 C14 input connector, and a surge energy rating of 310 Joules to protect against damaging power spikes. The typical transfer time of 6 ms (max 10 ms) ensures a seamless switchover to battery when mains fail.

Additional benefits include RJ45 network line surge protection, a typical 8-hour battery recharge time, and an acoustic noise level of approximately 40 dBA, maintaining a quiet workspace. This UPS is ideal for preventing data loss and hardware damage in PCs, networking equipment, and other sensitive electronics.

Key Features:

• 500VA/300W output capacity


• 4 IEC C13 outlets (3 battery backup + 1 surge only)


• User-replaceable sealed lead-acid battery (RBC2)


• Nominal output voltage: 230V


• Input voltage range adjustable between 160-300V


• Standby UPS topology with stepped sine wave output


• RJ45 data line surge protection


• Typical transfer time: 6 ms


• Surge energy rating: 310 Joules


• Compact tower design (165 x 91 x 284 mm)


• Weight: approx. 6.32 kg


• Acoustic noise level: 40 dBA