Sunlight Backup User Guide

Page 7

and other names are trademarks of Enphase Energy, Inc. Data subject to change.

SBS-HM-UG-0020-01-EN-US-2022-03-03

System behavior

Power produced in a Sunlight Backup system depends on the solar irradiance at your

location, which can vary depending on cloud cover, shading on the PV panels, time of

the year and other factors. While running o-grid, the system may shutdown if the power

produced is less than what is needed to power the loads. To prevent a system shutdown,

work with your installer and ensure that the system follows the guidance on load selection

provided in the section above.

In the event of a shutdown, the system will automatically recover and restore power to

the essential loads. While recovering, the system will try to identify the load causing the

shutdown and disconnect it to ensure that the other essential loads can be powered on.

This logic is described in detail below:

• When the system shuts down while running o-grid i.e., microgrid collapses, all the

essential loads are powered o.

• If there is sunlight available, the system can take up to two minutes to restart and start

restoring power to the essential loads. At this point the loads that are in Manual mode

and are congured to be powered on will turn on.

• Next the system will power rest of the essential loads in a pre-determined order as

outlined below:

• The order in which the loads are powered on is the same in which the loads are

displayed in the Enphase App (Menu→Settings→Load control).

• Time interval between loads being powered on is 22 seconds.

• If there is a system shutdown within 22 seconds of a load being powered on, the system

considers that load to be responsible for the shutdown.

• If a load causes ve system shutdowns, the system fully disables that load—the load

is powered o and will not be automatically powered on when the system is o-grid.

You can use the Enphase App to turn the load on when irradiance increases (for example

in the afternoon) by changing the load to Manual mode (Menu→Settings→Load control-

>”Load_Name”→Manual).