Powerwall 3 is a fully integrated solar and battery system. The home's PV array is connected
directly to Powerwall 3, which converts solar energy and stores it for future use. Powerwall 3 is installed with Backup Switch to control the system's connection to the grid and monitor home energy consumption.
Figure 1. Example System Diagram
The following table outlines the key Tesla components in a
standard Powerwall 3 system.
Tesla Components
Tesla Part Numbers
Component
Description
1707000-xx-y
Powerwall 3 is an
integrated solar and battery system that converts energy from
solar panels or Solar Roof to be used by
the home, and stores excess energy for future use. Every system
contains at least one Powerwall 3, with
additional Powerwall 3 units
installed depending on the home’s solar
system size and/or energy consumption.
MCI-1
The Tesla Mid-Circuit Interrupter (MCI) is a
device installed in the PV array to stop solar production when:
Rapid Shutdown (RSD) is initiated
Loss of inverter (Powerwall 3) power is detected
A system fault is detected
MCIs, which are normally closed devices, open in either of
these conditions, bringing DC voltages to safe levels within 30
seconds.
MCI-2
1624171-xx-y
Backup Switch monitors energy usage and manages the transition to
and from backup operation.