c1 drafted · lead Battery energy storage system
- sixx-20-us-event-messages
sec=h60h=66024105cc48 - stpsxxus-20-event-messages
sec=h68h=66024105cc48 - Event 9353 with Sunny Boy Storage SBS3.7/3.8-US/5.0(-US)/6.0(-US)-10
sec=h1h=40e2ed92ca3f
Battery thermal management failure
The system that controls the battery's temperature has reported itself as defective. On SMA storage inverters it shows as event 9353, which points to a problem with the battery. A related event says the battery heating procedure did not succeed. The usual cause is the battery firmware, so first check whether newer battery firmware is available and install it. For BYD batteries, the firmware should be version 3.013.C or later. If the message comes back after the update, contact the Service or the battery manufacturer. Owners should contact their installer.
Claims
affects
caused_by
c2 drafted · lead Device firmware defect
The SMA knowledge base says event 9353 most likely comes from a battery firmware issue.
- Event 9353 with Sunny Boy Storage SBS3.7/3.8-US/5.0(-US)/6.0(-US)-10
sec=h1h=40e2ed92ca3f
presents_as
c3 drafted · lead Battery error reported
Shows on the storage inverter as event 9353, which points to a problem with the battery.
- Event 9353 with Sunny Boy Storage SBS3.7/3.8-US/5.0(-US)/6.0(-US)-10
sec=h1h=40e2ed92ca3f
mitigated_by
c4 drafted · lead Firmware update
Check whether the battery has newer firmware and install it. For BYD systems, battery firmware should be 3.013.C or later.
- sixx-20-us-event-messages
sec=h60h=66024105cc48 - stpsxxus-20-event-messages
sec=h68h=66024105cc48 - Event 9353 with Sunny Boy Storage SBS3.7/3.8-US/5.0(-US)/6.0(-US)-10
sec=h1h=40e2ed92ca3f - Event 9354 with SBSx.x-10/-US-10
sec=h1h=aaf5531ba5c2
c5 verified · fact Contact manufacturer service
Contact the Service if the message comes back after the update, or contact the battery manufacturer for next steps.
- sixx-20-us-event-messages
sec=h60h=66024105cc48 - stpsxxus-20-event-messages
sec=h68h=66024105cc48 - Event 9353 with Sunny Boy Storage SBS3.7/3.8-US/5.0(-US)/6.0(-US)-10
sec=h1h=40e2ed92ca3f - Event 9354 with SBSx.x-10/-US-10
sec=h1h=aaf5531ba5c2
verified by: review-workflowverified on: 2026-10-24
c6 verified · fact Contact system installer
System owners are told to contact their installer.
- Event 9353 with Sunny Boy Storage SBS3.7/3.8-US/5.0(-US)/6.0(-US)-10
sec=h1h=40e2ed92ca3f - Event 9354 with SBSx.x-10/-US-10
sec=h1h=aaf5531ba5c2
verified by: review-workflowverified on: 2026-10-24