4.18 Error 81
Fault description: Host loss.
Analysis：
1. In three phase system，inverters under P1 phase should start first.
Suggestion:
1. if there is only 1 inverter under P1 phase，this inverter should start first.
2. if there are 2 inverters under P1 phase，normal operation is：switch on battery first，let
inverter switch、pv switch、AC input switch keep off，switch on P1 phase inverters switch
at the same time ， then switch on inverters under P2 phase ， switch on P3 phase
inverters at the end.
4.19 Error 20
Fault description: BMS communication error.
Analysis：
1. battery communication protocol is different from our inverter communication protocol.
Suggestion:
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.
3. 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.
4. 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.
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