BAT FULL : where is batt full variable as this is used to control the cutoff.
Fix Volts: you can adjust the output voltage in UPS line during the load shedding. You need to insert the voltmeter in output line in-order to adjust this. Should e around 260 Volts once Batteries are fully charged and enters into load shedding. Later, once Batteries will discharge then will drop to around 220 Volts.
Amps settings: as the name suggest, you can control the charging rate with this and adjust it in accordance to your Batteries and load shedding routine in your area. You need clamp type amp meter in-order to adjust this.
Main low and overload: donāt disturb this, as you donāt have a test Bed to adjust this, UPS shops have as they got panel with different lights with different loads in-order to adjust this.