Solar Panel Energy

Hi please help with this Luxpower 5KW Off-Grid Inverter setting. I am trying to set the inverter to keep the batteries at a minimum of 50% charge for back up storage. The solar will charge back up to 100%, the battery will assist the solar until 50% then the grid will continue. I have set it to AC charge according to battery SoC, see below. But the battery remains at 99%, even when there is not enough solar.

Please disable “AC charge”. In the AC charge time period, the grid will supply load and the inverter won’t discharge but keep ready for charging using grid power when SOC requirement is met.