10 Aug '17, 2am

Go Off-Grid with Solar Power Explore the components & considerations

Go Off-Grid with Solar Power Explore the components & considerations

PV array. The modules and module support structure are the same for off-grid and grid-tied systems, but with an off-grid design, the module series-strings tend to be much smaller, typically with strings of three or four modules each. (We’ll discuss this more in “Array Layout.”) Rapid shutdown. Off-grid systems use string inverters (not microinverters), which means they need a dedicated system to meet rapid-shutdown requirements. This usually takes the form of a rapid-shutdown control switch that communicates with a disconnecting combiner box at the array, as with a standard grid-tied string-inverter system. Charge controller and batteries. In an off-grid system, the solar-generated DC power from the array passes through a charge controller on its way to the batteries. The charge controller regulates the flow of power and steps down the voltage to the proper level for the b...

Full article: http://www.motherearthnews.com/renewable-energy/solar-pow...

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