Originally Posted by conachair
Ah, didn't try very hard on Google, seems most now have a heating
element in the plate, every so often the plate is heated to above a set temp. That sounds easy, but what sort of temp and how often?
That is describing a frost free fridge like in your house, it works of course, but is horribly inefficient from an electrical
use standpoint. If you felt you needed this anyway, I would wrap "heat tape" around your evaporator, heat tape is used of course to keep pipes from freezing. I think you'll have to determine how often and for how long to power the tape from observation.
You are plugged into shore power
On edit, another way of course is a reversing valve and use the refrigerant as the heat source, more efficient, but more complex. That is how a house heat pump defrosts when in heat mode, except of course the heat strips come on the re-heat the air so your not blowing cold air into the house, of course in defrost mode your AC is battling your heat strips and your paying.