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Help growatt sph3000 killing battery


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Hello all

i have installed 12 panels 285w connect to a growatt sph3000 and 200ah batteries.

the issues I have is :

    - the inverter discharge the batteries below 50v even that I configured the LV at 50

   -at night wen the batteries discharge to 50% the inverter start to charge with 210w then discharge a little more. And do this all night long until the PV have enough power to charge the batteries.

   -wen I set export limit to 0, sometimes the system export to grid draining also from batteries. I thing the batteries must be use only for load house, not to export.

any one can help me to try do solve this.

best regard and thanks 

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