Fault warning code 4

Hey guys,

My 2000w inverter/charger turned off after beeping with a fault warning 4 (low battery voltage). What would cause my battery to be low voltage. The whole system is <4 months old. Don't know what could be the problem and how to fix it. 

My battery voltage is reading that it's 12.5 on my charge controller and my battery monitor. Any thoughts?

Thanks y'all


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