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Gel Type Battery: Silica gel matrix is the component of the electrolyte present in this lead-acid battery.

Grid connected (in a PV system): The photovoltaic system where the solar array performs the task of a main plant generator that supplies the grid with power.

Ground loop: It is an almost unwanted current, present in a conductor, which joins 2 points. These are supposed to be at the same potential, like ground, but are actually at two different potentials.