I was advised by a solar
dealer that my fridge
control in my 2007 Casita
uses approximately .5 amp per hour or 12 amps in 24 hours.
For my typical usage, this is the biggest drain on my batteries when boondocking
and water pump when in use, use more amps but don't run 24 hours a day.
Replacement of exisiting lights
with LED lights
is a must for serious boondocking
If you have the standard Group 24 battery you probably have around an 85 amp hour battery.
Add up your estimated amp hour usage of your systems and you can get a rough idea on how long you can boondock.
You should target not using up more than 50% of your battery's capacity. Using more than that over a prolonged period will seriously reduce your battery's life.
Consider the use of solar
and or a generator
to recharge your battery each day.