
There are two general types of PV Systems. Here are the differences and components required for both the setups.
OFF GRID SYSTEM (STAND-ALONE)

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PV Module
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Inverter
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Charge Controller
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Solar Battery
GRID CONNECTED SYSTEM (FEED-IN)

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PV Module
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Inverter
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Feed-In Meter
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Usage Meter
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Power Grid (TNB)