Do you mean the max amps the appliances will be drawing when in use?
Something like that, but not exactly.
If your battery pack is 12V, he is asking how many amps will be drawn from the battery pack.
Your appliances, if they are not 12V appliances in an RV, probably use 120VAC from an inverter.
The current (amps) drawn by a 120V appliance isn't one-for-one with current drawn from battery.
If you have a 1200W appliance at 120V, the current it draws is 1200W/120V = 10A AC
But for an inverter to provide that much power, it has to draw the same amount of power from the battery.
Battery is lower voltage, so higher current.
12000W/12V = 100A
So about 100A continuous current would be drawn from the battery, if inverter was 100% efficient.
assume inverter is 80% efficient.
100A/0.80 = 125A, so that is the continuous current.
Do you have any loads with a motor? Starting a motor requires additional current. You may notice that lights dim momentarily when it turns on.
Whatever the label rating is, multiply it by 5 as an estimate.
I have a window air conditioner rated 480W, 4A at 120VAC. It draws about 2400W for an instant, 20A
2400W/12V = 200A instantaneous. For inefficiency, 200A/0.8 = 250A max discharge current
480W/12V = 40A. 40/0.8 = 50A continuous discharge.