Backup Loads Supported per Powerwall Quantity
- The largest load in the backup circuit is limited by the quantity of Powerwalls; the largest load/breaker size each Powerwall 3 can support is determined by the selected Powerwall 3 breaker size and configured power output (see Install Powerwall and Generation Breakers in the Backup Gateway)
- See Appendix E: Installations with Multiple Powerwall 3 Units for requirements for installing multiple Powerwall units.
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
185A:
- Increase number of Powerwalls
- Relocate AC unit/motor load out of 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
NoteDouble-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) when off-grid; for instance, if Powerwall 3 has a configured power output of 5 kW, (2) Powerwall 3 units would be required to back up a Tesla vehicle charger.
Per the Vehicle Charging During Outage feature, the system will adjust the charging power during an outage to ensure Powerwall can continue to support the home without overloading Powerwall, and will only charge the vehicle when the percentage of charge is higher than the limit set by the customer.