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APC was founded in 1981 by three MIT Lincoln Lab electronic power engineers. Originally, the engineers focused on solar power research and development. [ 2 ] When government funding for their research ended, APC shifted its focus to power protection by introducing its first UPS in 1984.
The offline/standby UPS offers only the most basic features, providing surge protection and battery backup. The protected equipment is normally connected directly to incoming utility power. When the incoming voltage falls below or rises above a predetermined level the UPS turns on its internal DC-AC inverter circuitry, which is powered from an ...
A valve-regulated lead-acid battery is a battery type that is popular in telecommunications network environments as a reliable backup power source. VRLA batteries are used in the outside plant at locations such as Controlled Environmental Vaults (CEVs), Electronic Equipment Enclosures (EEEs), and huts, and in uncontrolled structures such as ...
This combination reduces the cost per cycle, saves on replacement and maintenance costs, enables the battery to be downsized and extends battery life. [ 106 ] [ 107 ] [ 108 ] Supercapacitors provide backup power for actuators in wind turbine pitch systems, so that blade pitch can be adjusted even if the main supply fails.
WZ-550 APC 4x4 mass production version. WZ-550 Anti-tank Missile Carrier Designation ZSL-02B. Four HJ-9 launchers, laser designator and thermal-tracking sight are mounted on an elevated platform at the rear of the WZ-550 chassis. [30] PTL-87 Assault Gun Prototype assault vehicles developed in 1980s based on modified WZ-551 chassis. [14]
Data from Jane's All The World's Aircraft 2003–2004 General characteristics Crew: 2 Capacity: 4 passengers Length: 10.93 m (35 ft 10 in) (fuselage length), 12.94 m (42 ft 6 in) (overall length, rotors turning) Height: 3.34 m (10 ft 11 in) Empty weight: 1,220 kg (2,690 lb) Max takeoff weight: 2,250 kg (4,960 lb) Fuel capacity: 540 L (143 US Gal) Powerplant: 1 × Turbomeca Arriel 2B turboshaft ...