Video Gallery Exact Solar Exact Solar is an award-winning local installer of solar energy systems in PA and NJ. We specialize in solar electric (PV), solar battery, and solar pool-heating options. We are your one-stop shop for all your solar needs! Other Resource Videos An excellent video that explains how solar water heating systems work About solar pool heating and the Aquatherm collectors we use here at Exact Solar How does a solar photovoltaic cell work? How do solar photovoltaic (PV) systems work?