tender for supply, installation, commissioning and maintenance of 7.5 kva online ups / inverter and buy back of existing ups at bridge and roof company ( i ) ltd-- 1 on line ups / inverter at our 4th floor kolkata office. to be supply / installation & maintenance 2 7.5 kva on line ups (180v dc)single phase in & out, for at least 1 hour backup with full load. smart lcd display for real-time information,dsp technology with igbt based invertergalvanic isolation transformer, emi/rfi noise filtercvcf (constant voltage constant frequency) operational without batterysoft start, compact & sleek designmake: - unitron/ luminous / microtek 3 compatible battery rack for whole set-up 4 12v/65ah smf batteries(lead-acid battery), for at least 1 hour backup with full load.make: - amaron quanta/ luminous / exide 5 ups/inverter- buy back items 6 buy-back (ie minus). existing online ups of capacity 1000va 7 buy-back (ie minus) 65ah lead acid 12v batteries 8 buy-back (ie minus) 200ah lead acid 2v batteries 9 buy-back (ie minus) smps based power unit of capacity 48vdc 10 warranty- 2 years onsite warranty for batteries and 3 year for ups.the vendor has to provide support to us physically, telephonically, or virtually if any type of problem arises in the said ups(s) during the warranty/contract period including following.• service of onsite comprehensive maintenance basis.• agency shall provide monthly preventive maintenance within the quoted rate for servicing theups as well as render unscheduled on-call services to keep the ups always in operational condition.• agency shall repair and replace any or all parts of the ups in case of defects as required from time to time for keeping the ups absolutely in operative condition within the quoted rate/charges.• the service will include all installation accessories and labour.