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Langley [L]
Unit of solar radiation. It corresponds to one gram calorie per square centimeter. 1 L corresponds then to 85.93 kWh/mē.

The angular distance to a point on a celestial object, measured north or south from the celestial equator; it is defined as NORTH or SOUTH latitude according to the hemisphere in which the point is.

LCC(Life-Cycle Cost)
Method to determine the installation and maintenance costs of a system of electric generation during its total lifetime.

Life cycle or Duration of a battery
Conventional value showing the number of charging and discharging cycles executed by the battery before shutting down. It is usually featured with mode limitations of charging and discharging cycles.

Limit voltage
In ON-OFF regulators it is referred to the amount of voltage beyond which the PV generator automatically disconnects from the accumulator batteries.

Anything in an electrical circuit that, when the circuit is turned on, draws power from that circuit.

The arc or portion of the equator intersected between the meridian of a given place and the meridian of Greenwich, passing through the north and south poles at right angles to the equator.