How to get static member of extended class

Question

I want to override operator+ for my classes Fridge and TV (to make it add power consumption), so I made them extend Rtv class which should override that operator, however I don't know how to get proper POWER_CONSUMPTION field value if both Fridge and TV have different overriden value. To be more precise i want to achieve this to be possible:

  Fridge fridge = new Fridge();
  Tv tv = new Tv();
  int totalPowerConsumptionOfFridgeAndTv = fridge + tv;

My idea for Rtv class was:

  class Rtv
{
    private const int pOWER_CONSUMPTION= 0;

    public static int POWER_CONSUMPTION=> pOWER_CONSUMPTION;

    public static int operator+ (Rtv a, Rtv b)
    { 
        return a.GetType().POWER_CONSUMPTION + b.POWER_CONSUMPTION;
    }
}

But simply doesn't work.