Microtek Inverter Giving problem. Review on Microtek UPS SEBz 1100 VA (1.1 KVA) Pure Sine Wave Inverter

Everyone needs Inverter for home purpose and bussiness purpose.Last year I buy Microtek UPS SEBz 1100 VA(1.1 kVA) pure sine wave inverter.I was tired because of power cut.I decide to use Inverter in my shop.I purchase microtek inverter from my nearst shop with exide batter.But the Inverter is taking to long time to recharge battery.It can not fully charge my battery.I contact about this problem to shopkeeper from whom I had purchased Inverter.He came do some replacement of parts in my Inverter, and say it is ok now will work properly.But the problem was not solved I contact him again.He told be that It will be problem in your electric fitting.If there is problem in my electric fitting why he did not tell me first time when he replayed some part in my inverter.I think was wrong because I buy bad inverter from wrong shop keeper