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Could you please give us best price for this batteries: Item 1.10 OPZV, 1500 Ahr Gel Battery. No. 146 Item 1.11 Battery Rack, two string each No. 6 Environment: 1..1 The hydrogen gas released under steady state float charge conditions at 20o C shall be less than 5 cm3 per Ah C10 nominal per 30 days in accordance with IEC 896-2. 1..2 Cells shall be capable of operating at any temperature between -20o C and +50o C, with a relative humidity (RH) for up to 100 % and at any altitude from -1000 m to + 10,000 m. Operational Requirements: 1..3 The end of battery life shall be defined when the battery system is capable of giving no more than 80 % capacity. 1..4 Parallel connection of cells in order to increase the battery capacity within string confirmation are not allowed, for series connection of batteries cell in order to get 24V configuration should be by provided connecting parts and accessories supplied by the manufacturer. A 2 parallel strings is required in order to get full redundant battery bank. Battery Racks: 1..5 A rugged steel construction for all main parts shall be used. 1..6 Main frames shall be of a fully welded construction. Rails shall be bolted to all frames and diagonal bracing shall provide added rigidity. 1..7 All metal parts shall be epoxy powder coated to a minimum of 50 microns. 1..8 An insulating adjustable foot shall be provided on each stand leg. 1..9 The frame should be designed to accommodate the batteries cells in horizontal position, 3 cells at each raw and four tiers for each string or in vertical position on one tier and 2 rows arrangement. Two strings stands should be installed near each others. Battery specifications: • Voltage per Unit: 2V (single cell). • Capacity:-1500Ah@10hr at 1.80V per cell @25oC • Internal Resistance:- 0.3 mΩ • Max. Discharge Current:- 12000A (5s) • Float charging Voltage 2.25~2.30VDC/unit Average at 20oC • Initial Charging Current less than 300.0A • Cycle Service: 2.40~2.50 VDC/unit Average at 20oC • Life cycle minim 2700 cycle at 60% DOD Test Certificate According to IEC 896-2: 1..10 The following tests should be carried out according to IEC 896-2 standard. • Thermal cycling • Control valves • Flammability • Gas emission • Thermal runaway • Capacity • Suitability for floating battery operation • Endurance in cycling • Charge retention • Short circuit current and internal resistance