Thank you all for replying to my question / problem.
To let you know I have two batterys in my rv. The inverter will only run the residental fridge about 45 minutes with the batterys fully charged.the xantrex will go to a code of c02 and shut down. The Mangum is set to 12 volts for the autumn start but doesn't start.
Second question ..what is an average run time with fully charged batterys and the only thing on is the residental fridge ?
Thank you for responding to my questions