IX
10.1 Troubleshooting........................................................................................ 134
10.2 Maintenance ............................................................................................139
10.2.1 Maintenance Notices....................................................................... 139
10.2.2 Routine Maintenance.......................................................................140
10.2.3 Replacing the Button Cell................................................................. 140
11 Appendix ......................................................................................................142
11.1 Technical Data.......................................................................................... 142
11.2 The Compatibility for Backup under Off-grid Scenario .................................. 153
11.3 Quality Assurance..................................................................................... 154
11.4 Contact Information................................................................................... 154