Lots of inverter in the market but I like microtek very much I am using microtek ups 1400 and inverter last 10 years first 2 years battery works good and beyond the warranty period then change the battery gradually start the noise from the ups automatically reduce the power back up then change the battery with su-kam then no noise problem and increase the back up microtek ups easy to use durable ups now I am happy with microtek ups and su-kam battery check the guarantee and warranty before purchase the inverter