Hello, I believe the didtribution breakers in the van are 10A max, therfore if you use 2.0kW for a heater, 0.13kW for the fridge, that leaves 2.4kW-2.0kW-0.13kW=0.27kW for anything else you plug in. You will also find that you need to "over load" the breaker for some time before it wil trip if you are just over it's rated A. Hope you find a solution to your problem!