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My Rosen LifePo4 48v 100Ah battery is completely discharged. It doesn't turn on and the voltage shows there's no charge in it. Its was connected to My off-grid Growatt SPF 5000TL HVM-WPV using grid/util power only...was planning to get panels later. The Growatt reports that the battery is...

Two days ago, (after about almost two weeks since installation), my Growatt SPF 5000TL HVM-WPV started showing warning indicator code 19. From the manual, it says "battery disconnect". The battery is a Rosen...48v, 4.8KW. Its voltage is now completely low and the inverter doesn't charge it...