I would like to know WHERE he found that info. Also, what does a manual/instructions for a Battery disconnect have anything to do with the Converter/Battery system operation system??????? What if you do NOT have a Battery disconnect????? Millions of RV's have NO battery disconnect, what happens to them?????? The plain fact is, having a LOAD (battery) will make a Power Converter operate more efficiently. Remember, Inverter/Chargers CANNOT be disconnected from the Batteries. They are hardwired directly to the Battery system. Of course Inverter/Chargers are smarter chargers. Without the OP posting Year/Brand/Model of RV and the Brand Model of his power converter, we cannot help him. He may have a defective Power Converter, if it stays at 13.6 volts and never goes to float. Also, is his voltage AT the battery and with a stand alone Digital multimeter. Or is he using some type of built in voltage read out system. Doug