Whole House Backup

Whole House Backup requires both roof-top solar panels and a battery.  The solar panels and battery are connected by an intelligent inverter that can direct power from the solar panels to either the house or the battery. A “transfer switch” automatically detaches the whole house from PG&E during an outage and reconnects it after grid power is restored. The illustration below shows how these components work together day and night to ensure you always have power for your entire house.

DAY NIGHT

PG&E GRID ON

  • The solar panels power the house
  • Excess solar power is sent to recharge the battery
  • If the battery is full, excess solar power is sent to the grid
  • If there is insufficient solar power, the battery or grid powers the house

PG&E GRID ON

  • The battery powers the house
  • If there is insufficient power left in the battery, power is drawn from the grid
  • If the battery is below its outage reserve level, the battery is recharged from the grid

PG&E GRID OFF

  • The transfer switch automatically detaches the house from the grid
  • The solar panels power the house
  • Excess solar power is sent to recharge the battery
  • If there is insufficient solar power, the battery powers the house

PG&E GRID OFF

  • The transfer switch automatically detaches the house from the grid
  • The battery powers the house.
  • If the battery is emptied before the sun rises or grid power is restored, the house will have no power

 
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