Photovoltaic (PV) modules convert sunlight into direct current (DC) via the photovoltaic effect. When photons hit the semiconductor junction, electrons move and create DC power—this is the raw output of your array. See the high-level background in the IEA's Solar Energy Perspectives. Homes and. . Ever wondered if you really need a battery for your solar panel system? You're not alone. Many homeowners face this question when considering solar energy. It's a common scenario: you want to harness the sun's power but aren't sure how to store that energy for when you need it most. Nearly all electricity is supplied as alternating current (AC) in electricity transmission and distribution systems. Devices called inverters are used on PV. .
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