Art, I believe the system is set up so all 12 volt items run directly off the battery(s) and not the convertor. The battery is capable of handling power draw (surges) that would exceed the convertor's output. For example, the motor that opperates the slides hydraulics by itself comes close to exceeding the convertor maximum output. So in essance, all 12 volt items draw from the battery and the convertor monitors this draw and recharges accordingly. In times of heavy battery useage, the convertor runs at maximum output which creates more heat and causes its fan to kick on.
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