Loads Supported per Powerwall Quantity

  • The largest load on the backup circuit is limited by the quantity of Powerwalls; the largest load/breaker size each Powerwall can support is determined by the selected Powerwall breaker size and configured power output (see Powerwall 3 Specifications for power output options).

AC Units and Large Motor Loads

  • Inrush current (largest instantaneous current draw when a motor starts) is limited to 185 A locked rotor amps (LRA) per Powerwall 3.
  • For air conditioner units, use locked rotor amps on equipment label as inrush current.
  • Design options if motor locked rotor amps is greater than the number of Powerwall 3 units multiplied by 185:
    • Increase number of Powerwalls
    • Relocate AC unit/motor load out of the backup circuit
  • Example:
    • Motor load unit with 200 A locked rotor amps
    • Required Powerwall(s): (2) Powerwall 3 units required, so that 200 A < 370 A
    Informational PurposesAn informational icon, calling your attention
    Note
    Double-check that the AC breaker follows the Powerwall breaker sizing rules.

EV Charging

Type of Electric Vehicle Charging Compatibility
Tesla vehicle charging (Wall Connector or Tesla Mobile Connector) 1 Powerwall*
Third-Party Level 1 EV charging 1 Powerwall*
Third-Party Level 2 EV charging 1-2 Powerwalls*

*Ensure the configured power output is great enough to support the charger(s) on the backup circuit; for instance, if Powerwall 3 has a configured power output of 5 kW, (2) Powerwall 3 units would be required to support a Tesla vehicle charger.

Powerwall coordinates with Tesla vehicles for enhanced vehicle charging. It will adjust the charging power to ensure it can continue to support the home loads without overloading itself, and will only charge the vehicle when the percentage of charge is higher than the limit set by the customer.