supply , installation and commissioning of 15kva online ups with one hour backup including batteries on buyback basis , design , manufacture , testing at factory , supply , installation , testing and commissioning of state of the art 15 kva capacity three phase input , digital signal processing controlled , igbt rectifier technology based online ups system complying all technical specifications / features / international standards as described in the tender document . , supply , installation , testing and commissioning of batteries of make- exide / quanta / southern make tubular batteries to provide required battery backup of minimum 1 hour and complying all technical specifications indicated in the technical and commercial bid . the battery bank rate shall include the cost of battery rack to house all the batteries . the minimum total ah shall be 24000 vah ( 12 v , 100 ah- 20 pcs ) . , buy back price of numeric make 15kva ups with 20nos 100 ah existing battery . , comprehensive annual maintenance charges for the above set consisting of entire 15 kva ups including batteries after 3 year warranty period . to calculate lowest bidder amc amount for first 4 years ( after warranty period ) will be calculated , first year , second year , third year , fourth year