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The grid connect inverter converts the DC electricity produced by the solar panels into 240 V AC electricity, which can then be used by the property/household. If a grid connect system is producing more power than is being consumed, the surplus is fed into the mains power grid to Govt. Govt will adjust the same in your next electricity bill or pay you for the same. Here is complete Detail, Size, Watt, Volt, Working, Technical Specification and Cost of  1kW 2kW 5kW and 10kW On-Grid Solar Power Plants.