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It is possible to install a solar system that is independent of the electrical grid, but also can be connected to gird power to charge battery
Hybrid solar systems combine the best of grid-tied and off-grid solar systems. It is basically grid-tied solar with the addition of battery storage.
A grid connected PV system is one where the photovoltaic panels or array are connected to the utility grid through a power inverter unit allowing them to operate in parallel with the electric utility grid.
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