The RV-12 power outlet is fused at 5 amps. According to the schematic (Skyview), the wire size is 18 awg. With a 5 amp load, the circuit would be loaded to maximum capacity. Normally circuits are only loaded to 80 percent capacity. Another consideration is how heavily the alternator and regulator are loaded. If everything is loaded to maximum capacity in a hot environment, the lives of components will be shortened.