Analysis：
1. battery communication protocol is different from our inverter communication protocol.
Suggestions:
1. if it’s Dyness brand lithium icon battery（B4850），please set L01 in program 05 setting.if
it’s Pylon brand lithium icon battery（US2000/US3000），please set L02 in program 05
setting.if error message still exist，please arrange to upgrade inverter firmware software
and BMS software
（https://drive.google.com/open?id=12ttv9oCoC2rowUPDdsjfs0P4fz9DuSVt，
https://drive.google.com/open?id=1MFgsuwvJ2BRs-uHHlTshcjIiOsQIPYBt），there is a
software，a video that guide you to upgrade software，a SOP file that guide you to
upgrade step by step，and a video that guide you to reset inverters factory setting
including.
2. if it’s other brand lithium icon battery，please also arrange to upgrade inverters firmware
software and BMS software，don’t forget to reset factory setting after upgrading，then
select US2 in program 05 setting for it.USE is designed for lead acid battery，US2 is
especially designed for lithium icon battery.
3. if inverter work with Pylon/Dyness icon battery，get 20 and 04 fault at the same（won’t
allow to change program 05 setting in this situation），and it’s hard to get a charger to
charge battery back to normal state，you can consider to reupgrade software to remove
20 fault first，then change program 01 setting to UTI and change program 14 setting to
SNU，in this way will avoid battery to discharge and charge battery as soon as possible.
3.13 warning 33
Fault description:Bms communication loss.
Analysis：
1. Bms communication loss.
Suggestions:
1. Check the communication cable wiring connection between inverter and battery，you
can disconnect it and reconnect again.
2. Change a new cable.
3.14 warning 34
Fault description:Cell over voltage.
Analysis：
1. Battery cell voltage is high.
Suggestions:
1. Test battery cell real voltage，check pv panels configuration if it’s really high，for
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