Unfamiliar with the term power plate. Our AB system has three components, compressor, condenser and evaporator. The evaporator plate goes inside the freezer/fridge, the other two devices outside. If it were me, I would defer to a marine refrigeration guy to determine whether it has any salvage value. Several variables come into play when dealing with what you have. Does it leak, what system was it working with, what refrigerant was used, etc.?