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Think of it this way. Take a 12 volt battery and hook some lights and other stuff up to it. That's your trailer. Then add a charging device to keep the batter charged - that's the converter. Now take it a step further by putting some values on things. Let's say the converter is rated at 45 amps. If you pull the cover off your fuse panel, you will note that if you add the total of the listed amp ratings of the fuses, you greatly surpass the 45 amps of the converter. If you drew your 12 volt electricity from the converter first, it would be exceeding it's rating. The battery is rated at a much higher amperage draw and will easily handle more than 45 amps. So electrical demands are met by the battery.
Think of it this way: The battery is a big bucket with little pipes running off to provide water to several places. The converter is like a hose thrown over the top of the bucket to keep it full. That's an over simplification, but I think it gets the point across.
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