Hey Guys and Girls, please post your enquiry on what you need and what application you want to drive e.g. the load or devices and for how long you want to sustain the power backup, Inverters are obvious the correct way to go as they are silent, noiseless, smokeless and on and on and very reliable. We are professional engineers on this applications and we do units from 600 watt up to 285 KW with online or offline technology. note the two differences, a inverter and a ups are quite different as UPS units, unless specified otherwise are shorterm backups and mostly “Kwasi” wave or as the public calls it Square wave (A step related formed sine wave, looks like staircase and bad for inductive equipment) and really very inefficient and bad for any system. We believe in making use only of Sine wave inverter equipment and with the high production volumes it does cost more or less the same these days as the Cheaper Square wave crap of earlier. Good advice, do it correct the first time and get a reliable supplier!! You can mail me on deon@electro-web.co.za and we will gladly help.