Batteries charge settings - Must PV330 hybrid inverter

Hello,
I have a MUST PV3300 hybrid system with batteries. The issue i have is that when batteries goes down during the night, the grid charges them. However it´s costing me a higher energy bill. I would prefer to use the grid directly to the house than charging the batteries.
Not sure how to do that on MUST settings.
Someone could help?
I have a MUST PV3300 hybrid system with batteries. The issue i have is that when batteries goes down during the night, the grid charges them. However it´s costing me a higher energy bill. I would prefer to use the grid directly to the house than charging the batteries.
Not sure how to do that on MUST settings.
Someone could help?