The “Panel Limit,” “Site Limit,” “Conductor Limit,” and "Current Limit" features are implemented in the Tesla Site Controller software, which operates on the Backup Gateway 2, the Powerwall+, or the Powerwall 3, depending on system configuration. Tesla’s Site Controller software is used across all Tesla Powerwall sites. Site Controller software controls the entire energy storage site and communicates over CAN and Wi-Fi. The Backup Switch, Backup Gateway 2, Gateway 3 and Remote Energy Meter(s) (if present) are part of a Powerwall system and contain current sensor(s) per phase as needed, to act as a Site and/or Solar meter, which measure the grid and uncontrolled power production sources.

This software is listed to the requirements in UL 1741 PCS and compliant with Article 705.13 of the 2020 and 2023 NEC, as described in Important Notes on UL 1741 PCS Compliance.