If its a 20 amp breaker be sure to use a 12 gauge extension cord. If it continues to blow breakers you have to find out why. Flip the house breaker back on with rv disconnected. Go into the rv and flip off all breakers. Reconnect power cord and turn on main breakers in rv but no branch circuit breakers. Continue to flip on branch circuit breakers in your rv one at a time starting with your converter circuit untill the circuit in the house blows again. Or, if you have a amp meter, measure each branch circuit amp draw until you find whats drawing so much current.
-Paul R. Haller-
p.s. check all connections between house breaker and rv. The power feed to the outlet, the outlet itself, the drop cord, and all rv breaker connections.