3.6 inverter no display red fault lamp
Powered down my inverter to fit second CATL battery
Power button on inverter off
DC PV rotary switch off
Etc etc
Fitted battery - pretty straightforward as per manual
Powered back up, but no display on inverter and red flashing alarm lamp ??
What have I done wrong
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The batteries report as working fine ( using the lights on the batteries themselves ) it’s the fact I have no display and this red alarm lamp that’s causing the issue I’m sure