I think the tipping point will be when we start getting fuel cells whose price isn't in the stratosphere. EFOY's product (runs on methanol), or Truma's VeGA (a propane fuel cell) would give enough charge to keep battery banks topped off, even with a compressor fridge running. After this happens, even though an absorption fridge is more efficient because it just directly burns propane to move the liquid through the coils, a compressor fridge would end up the standard, just because it doesn't need to be precisely level, and actively chills the contents.
