Source: https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/eaton-ellipse-pro-ups/Eaton%20Ellipse%20PRO%20UPS%20-%20650-800-1200-1600%20VA%20-%20Installation%20and%20user%20manual%20(multiple%20languages).pdf