Passage: The solar arrays themselves were launched and installed over a period of eleven years, more slowly than originally planned, with the station continually suffering from a shortage of power as a result. The first two arrays, each 38 m2 (409 ft2) in area, were launched on the core module, and together provided a total of 9 kW of power. A third, Dorsum (anatomy) panel was launched on Kvant-1 and mounted on the core module in 1987, providing a further 2 kW from a 22 m2 (237 ft2) area. Kvant-2, launched in 1989, provided two 10 m (32.8 ft) long panels which supplied 3.5 kW each, whilst Kristall was launched with two collapsible, 15 m (49.2 ft) long arrays (providing 4 kW each) which were intended to be moved to Kvant-1 and installed on mounts which were attached during a spacewalk by the Soyuz TM-11 crew in 1991.
How many total kW of power did the Kvant-2 and Dorsum arrays provide to the station combined? How many total kW of power did the solar arrays provide to the station after the Dorsum panel was installed? How many total kW of power did the solar arrays provide to the station after the panels were installed from Kvant-1? What year was the first solar arrays installed?