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by Antti Lahtinen
Since photovoltage cells transform a fraction of the incoming energy into electricity, I prefer to vary the energy output according to current conditions.
Notes: Cells are not very durable and must be attached to a suitable surface.
Cells are often armored with transparent cover to keep dust, sand, etc, from damaging the cells.
Since the photovoltage cells are quite expensive per unit surface, a solar cell array may consist of large solar collectors (lenses or mirrors) which concentrate the light to the cells. Some modern satellites have large lenses directly over the photovoltage cells so that the hardened lens is both armor and collector.
Example: TL-14+ photovoltage cell, 0.1 m2 area (20 x 50 cm)
|0.1 dm3||0.2 kg||0.5||0.1 m2||100 Cr|
In Terra the available solar radiation is ~1386 W/m2. However, due to atmospheric conditions a solar array can usually receive only ~1 kW/m2. The average output of the above photovoltage cell would be 50 W.
The weapon contains only three moving parts: trigger, safety and battery cover. The squeeze safety is placed on the backstrap on the pistol grip and is automatically disengaged by the firing hand. Instead of a trigger guard, the weapon has large knuckle-bow which allows shooting while wearing mittens.
Inside the battery cover is a power connector which can be used to re-charge the battery with external power or fire the gun directly using any suitable power source.
|5 kJ Laser||SA 5||6||Nil||3||100||None||None||300 (299)|
|15 kJ Laser||6||(Nil)||None||300 m||3 14||3.4 kg||0.6 kg||SA 5||100||639|
Notes: The weapon is covered with scratch-proof  photovoltage cells, which are used re-charge the magazine battery. When left on sun , the cells produce 50 W power. One shot is re-loaded in 7 min 25 sec .
 A 0.1 m2 solar array is fixed on both sides of the weapon. When the weapon is placed on ground, either of the arrays is facing up. The cells produce 50 W for each kW of solar radiation.
 I estimated how large array fits by placing 10 x 10 cm paper squares on Valmet M-82 bullpup assault rifle.
 The loading time is for 1 kW radation. I assume that the battery has ~90% efficiency. When the array puts 50 joules in the battery every second, 10% of this energy is turned into heat and only 45 joules are later available from the battery.