OPTI-UPS VS575C Standby Series 6-Outlet Uninterruptible Power Supply (345W, 575VA, Beige) 6-outlet uninterruptible power supply Maximum capacity: 575VA, 345 Watts 3 NEMA 5-15R battery backup outlets, and 3 NEMA 5-15R surge protected outlets Surge energy rating: 1050 Joules 5 minutes of battery backup at half load, and 0.6 minutes at full load