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Many people believe that line-interactive UPS systems are “online” designs, probably confused by the design's marketing name. Actually the line interactive design is merely an upgrade of the standby UPS and it is an offline type of system.
By adding a voltage autotransformer which can regulate the output voltage, the UPS gains the ability to regulate its output voltage. The inverter of the said UPS system operates at all times, charging the batteries and power the load while the utility power is normal and draws power from the batteries to power the load once the utility power fails.
Because of the autotransformer, the UPS always regulates its output voltage and will not switch to batteries during small undervoltage/overvoltage spikes. This makes it an ideal design for home and small business computers which are powered by an unstable utility power grid. Finally, the presence of the ever-working inverter makes the switching between utility and battery power much smoother, faster and considerably reducing switching transients.
This fascinated me, I had no idea there were so many varieties !
I really like these power supplies things KitGuru produce, ive learned so much.
I have always meant to pick up a UPS, just for protection to the computer, rather than for anything hard core.
Honestly, I can’t imagine running any system (house) without UPS. I learned that lesson long time ago the hard way and since then UPS is a must have. Right now running 3: APC SUA2200VA/1980W for primary PC, SUA1500VA/980W for 2nd PC, and another SUA1500 for TV,DVD and all other electronic equipment (including central heating controller/pump). Expensive and heavy piece of equipment but it is worth of every penny/cent/whatever tiny amount of cash :D.
One thing to remember. Never try to save money by buying cheap UPS. Go for APC.
thanks. due to an extraordinarily poor power grid we are dependant upon ups but have found it difficult to choose between them.