I bought a Microtek Inverter 850 VA on 2010. The inverter is still good condition and get good backup. It is better performance than the other brands of inverter. And it has some useful features and good specifications.
But one thing is noticed and point it that their service is not good as one time I have face a problem with this inverter and have a microtek inverter in warranty, so I complained issue to service centre, 2 days gone but nobody come. After that I call a private mechanic.
Any way Microtek Inverter is very popular because of its the reasonable and affordable price, good quality, compact sizes. Basically microtek inverter is comprises with bettery, UPS, digital voltage power stabilizer and cable etc.
It has wide input range of voltage is 100V - 300V and normal one is 180V to 260V. Out put UPS mode voltage about 210 V-/+ 5 percent and output frequecncy on the UPS mode is 50Hz -/+ 0.1 Hz. efficiency is>80%.