Quote Originally Posted by deon43 View Post
Checking if a inverter/UPS if not specified in the specification sheet can only really been done by means of a Oscilloscope, most electronic guys have such equipment, TV repair shops Radio repair shops and so on. Funny enough is that Sine wave inverter manufacturers are proud of their products and thus have no problem on adding Sine wave inverter on the description. If not mentioned directly on the Info pages or specification, be careful, that probably the real reason why not mentioning it and selling it cheap, lol Keep on buying until you learn to do the right thing and read the info! Most reliable inverters have a pre-power stage we call a Power Factor correcting circuit which serve a double purpose inside the inverter, firstly to make sure it can run at a good Power Factor of at least 0.9 that makes the system very efficient and secondly it compensate for input power fluxuations, thus it will easily work also from a generator. Good recommended quality worldwide systems are the Cotek systems (only inverters not Ups all sine wave) very expensive and the "POWERVERT" systems (UPS and inverters all sine wave) very good and relative cheap but only available from June onwards in SA.
if the person selling the equipment cant provide the equipment to test...best you find someone who can...how do they verify the equipment they are selling is correct and functioning correctly during commisioning.

Now is a good time to enquire about generators and invertors cause most of the fly by nights are out of bussiness or found other opitunities to make quick money.