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I I I I I I, I I I I , I ?i I I I I I I I ",j 3563 " the Bureau of Reclamation. The 10-horsepower system nominally pumps 425 gallons per minute from a depth of 38 feet. It consists of the following: * Two 44-rnodule, two-axis photovoltaic tracking arrays capable of producing 225 volts, 30 amps (6750 watts) * 500 gpn water pump and lQ-hp DC motor * Well head vault " * Control console, uninterruptable power s1s~em (UPS) instrumentation and safety equipment * Lightning protection system. \ Operation of the system is completely automatic. AC power is required and is derived from the DC source for the array azimuth and elevation motor drives. The water level control unit is also operated by low voltage DC. The UPS provides the auxiliary power requirements and it is sized to accommodate all array functions throughout a minimum of five days of inclement weather. Upon sun acquisition by the arrays, the priority is to charge the battery system of the UPS to ensure that backup po\oler is available. Using a DC motor avoids the power losses ensuing frOID use of an inverter as would be necessary in the case of an AC motor. The motor has a 4B-volt, battery-energized, shunt winding that ensures rapid pump starting. This insures that the pump bearings are not'subjected to any prolonged period without lubrication (water). The armature of the motor operates directly from an array voltage_,n,____.. ' The pump is a vertical axis turbine with a single stage impeller manufactured by Ingersoll-Rand. The pump has water lubricated bearings and a one-inch diameter line shaft-;- The maximum diameter of the pump'is 9;5- inches at-the galvanized steel strainer, which easily fits in the 12-inch,diameter well. _~-- , The pump is prevented from operating at insolation levels less than 500 watts/square - meter,=This 'insures that-,the adequate -headctand--fiow)-is-developed-toc-iubricate-the---- pump shaft bearings. The insolation level at which pumping is initiated is readily adjustable if the water table or flow characteristics of the well change. Another safequard built into the control system fA a time delay on the motor to prevent it from being restarted immediately after a shut-down. This accommodates the reverse turning of the motor due to backflow from the diSCharge piping. A watertight concrete vault 9'8" x 12'2" x 7'4" contains the well-head pump and rotor, switch gear, UPS, and control electronics. An anemometer mounted on top of the vault provides stow and wake-up command for operations in windy weather. Two 44-module, point-focusing Fresnel concentrating arrays provide the power for water pumping and all auxiliary loads. The sun tracking system optimizes daily energy collection and provides a nominal 225 volts at 30 amps (6750 watts) as the standard operating conditions of the site. Operation and Maintenance The project will be operated and maintained by Bureau of Reclamation personnel although there are plans to contract maintenance with the Rio Grande Water Conservation D1str1ct (R~~CD) 1n the future.