Hello, I have a travel trailer that is parked with only 30 amp shore power.
Problem: The shore power breaker trips when I apply too much load. Solution I am looking for:
I would like to create a backup power supply that boosts the shore power when the load exceeds 24 amps to prevent the shore power breaker overloading
Can someone tell me which unit I need to do this?I would like the least expensive solution.
Hello and welcome to the Victron universe 
Where in the world do you usually drive your vehicle?
In terms of the current, it sounds like a 120V connection… So I’m guessing America… 120V only or 240V split-phase
Power Assist:
It is a 120v , 30 amp shore service power
A Multiplus set up correctly will do what you are asking. Its the power assist feature. When shore power is insufficient for the loads it will draw from the batteries.