Sunny boy 7.7 Secure Power Supply with rapid shut down solution

[dnbuggy]

I was told last year when I purchased my Sunny Boy 7.7 system, that there would be a solution down the road (firmware update of some sort) to utilize the secure power supply (power available during grid outage) even with the TS4 rapid shutdown modules installed. Has anyone heard any info on this?

[Mr4btTahoe]

I was told last year when I purchased my Sunny Boy 7.7 system, that there would be a solution down the road (firmware update of some sort) to utilize the secure power supply (power available during grid outage) even with the TS4 rapid shutdown modules installed. Has anyone heard any info on this?

Looks like there are some work arounds...

https://www.stellavolta.com/blog/technical-note-sunny-boy-us41-secure-power-supply-operation-with-ts4ro/

[brycenesbitt]

For background for people searching for this. The Secure Power Supply, a valuable feature, and the rapid shutdown, a code requirement, don't mix well. From the 3.0 Sunny Boy manual:

"If the available accessory communication set for TS4-R module technology components (SMA Rooftop Communication Kit) is installed in the inverter, the secure power supply operation is no longer available. The Rooftop Communication Kit supports the Rapid Shutdown function. The AC circuit breaker in the system is simultaneously the Rapid Shutdown Initiator. In the event of a grid failure or when operating the Rapid Shutdown initiator, the inverter is also disconnected from voltage sources on the DC side. Thus the supply of the outlet for secure power supply operation can no longer be guaranteed."

Some background is here:
https://www.acsolarwarehouse.com/new...%20initiation.