Blackouts can happen all the time and quite often, unannounced. The grid may be down for hours or days or even weeks. Smart businesses don’t chance but instead they actively prepare for such occurrences by setting up backup power systems which can supply electricity to critical loads or even the entire office when the grid is down. There are various kinds of emergency backup devices depending on the type of energy source they are using to produce electricity. At Tunnelnet, we have a variety of backup systems, all by APC & Mecer. They are back-ups (650va - Back up UPS 20kva), power inverters, smart UPS rack tower and smart UPS rack-mount.