It is necessary to regulate that power to prevent overcharging the batteries as well as overloading the inverter/charger.
The PV power can even be used to charge the batteries: when there is more PV power available than used by the loads, the power will automatically run through the inverter in reverse direction and charge the batteries. The PV Inverter will accept this micro-grid and will therefore operate even during a black-out. When the Multi or Quattro is operating in inverter-mode, disconnected from its AC input, it will create a local grid: a micro-grid. When the Multi or Quattro is connected to the grid, this excess PV inverter power will automatically be fed back to the grid. PV power is first used to power the loads, then to charge the battery, and any excess PV power can be fed back to the grid. In an AC-coupled system, a grid-tied PV inverter is connected to the output of a Multi, Inverter or Quattro.
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