> http://www.waecousa.com/page.asp?page=rsa-60
>
> This is a Danfoss compressor (used in Engel and Norcold) unit that
> somehow can shut down at night and keep stuff cold using some magic
> cold/energy accumulator. I have no idea what that "cold accumulator"
> system is all about.
>

Well, since they describe it as being associated with the evaporator,
I suspect that it's a relatively massive metal "cold sink" attached to
the fins of the blow-thru part of the evaporator that gets cold while
it runs, and then keeps the evaporator cold even after the compressor
shuts off. What it would do is make the compressor run longer, but
less often. Dunno what sort of efficiency trade off you get for that.