GM Energy V2H Bundle Installation Manual 91
Third-Party Generator Compatibility
GM Energy has identified multiple configurations that support installations with automatic transfer switch (ATS) Generators
and manual transfer switch (MTS) Generators. Installations outside of approved configurations may result in damage to the
third-party Generator and/or the GM Energy equipment and may impact the customer's warranty coverage. Please see the GM
Energy limited warranty for more details.
The GM Energy Home system can be integrated with a residential Generator if installed per the guidelines outlined in this
section. With either option, a UL certified transfer switch is required to ensure there is no back feed of the Generator to the grid
or GM Energy Home Hub. The transfer switch must be delayed transition or open transition type. The Generator integration
scenarios include the Generator either downstream of the Home Hub or on a separated circuit originating at the service
entrance. Generator must not be placed upstream of the Home Hub.
Note: The Generator integration options are to act solely as guidelines for installation. These guidelines do not supersede any
local, state, or national regulations, codes and laws. The installer is responsible for ensuring safe and compliant installations.
1. Flexible Source Backup
• Generator is downstream of Home Hub’s backup panel. House loads on “flexible backup” panel are powered by either
the GM Energy Home system or the Generator.
• Vehicle and/or PowerBank is default source of backup power for the home. If the vehicle is not providing backup power
and/or the PowerBank energy is depleted, the home loads can be switched to Generator backup automatically via ATS
(automatic transfer switch) or manually via MTS (manual transfer switch).
• A transfer switch (automatic or manual) must be installed between the Home Hub panel and a flexible source back up
panel. The transfer switch must be configured such that the Home Hub and Generator are always powering loads
independently and never on the same electrical bus.
• Note, additional non-backup panel(s) upstream of the Home Hub are also allowed if needed (not pictured). Additional
sub panel(s) downstream of the GM Energy Home Hub and Flexible backup panels are also if needed (not pictured.)
Figure 44: Example setup of a Flexible Source Backup Generator configuration
To Next Page