My SMA Sunny Boy Smart Energy battery isn't charging - which events matter?
Short answer
On SMA Sunny Boy Smart Energy, battery events include 9308 (battery communication error), 9350 (battery status change timeout), 9394 (deep-discharge protection) and 9345 (charge too low for start-up, needs a qualified person urgently). Check the app shows the battery as on and online, then contact your installer. Event 9102 means charging is blocked until the installer resets it.
Last checked 24 September 2026 · 1 source
What does this mean?
9342 DC polarity reversed often appears with 9102. 29254: not enough PV/battery power for backup (SPS) load.
What should I do first?
Record the code and current battery state before changing settings. Follow only the owner-safe reset steps in the manual.
When do I need an engineer?
Use an installer or manufacturer support route if the fault returns, involves isolation or protection, or the manual does not give an owner reset.
What to do next
If the system is hot, smoking, damaged or making unusual electrical noises, move away from it and follow the manufacturer emergency guidance.
Sources
Last checked: 24 September 2026