This is a typical 30AMP Electrical layout for the trailers. Might give you an idea of what power sources run different things inside the trailer. The 120VAC and 12VDC Power Distribution Panel is the center main component of the electrical system functions...
Most folks new to the RV's don;t realize what things runs from only the 12VDC side of things... Requires a good charged battery when using off the power grid which is powered by the converter/charger unit when connected to 120VAC Shore Power or Generator.
When running off the battery without being connected to shore power alot of things in the RV will drain the battery rather quickly. These are called parasitic drains. ALot of folks will disconnect their batteries when sitting and not being used...
We always check our batteries alot here to make sure they have fluids and are at least 90% charged at all times by just looking at their resting DC VOLTAGE which we like to see around 12.5-6VDC..
Roy Ken
