APC Smart-UPS XL 1000VA, 1 kVA, 800 W, 50/60 Hz, 320 J, 42 dB, Sealed Lead Acid (VRLA) APC Smart-UPS XL 1000VA. Output power capacity: 1 kVA, Output power: 800 W, Input frequency: 50/60 Hz. Battery technology: Sealed Lead Acid (VRLA), Typical backup time at full load: 9,7 min, Typical backup time at half load: 33,9 min. Product color: Black. Certification: C-tick,CE,EN 50091-1,EN 50091-2,GOST,VDE, RoHS 7b. Weight: 27,3 kg https://www.alphr.com/apc/apc-smart-ups-1000va/30312/apc-smart-ups-1000va-review This 1,000VA floor-standing UPS tips the scales at nearly 19kg; twice the weight of many of the other products here. Along with this reassuring weight, its battery has good longevity and can supply enough juice to keep a draw of 335W going for 20 minutes.... Not the cheapest, but the management software and range of features make it a winner...