Nice Setup, Ben, I'm jealous! (I'm comin', Mah-tha, I'm comin'!! Jest ain't theyah quoite yet!)

Garth and Memmel;
I know of a guy in Maine who does it, and the harvest and delivery is free. He made a deep, insulated trough off his north roof, as I understand it, and lets the snow pack in there all winter, then covering it in the early spring with an insulated top. Keeps a BIG block of ice way into summer,
as I heard it. He also gave his neighbors hot showers on the AFTERNOON of the big icestorm, 9-10 years back.

Could also be done by just freezing up a pool/tank of water-brine-or propy/glycol.. (designed to take the size changes) when the nights are cold enough to run a heat exchanger of some sort.. the magic is in the insulation, which is the key in your battery for keeping one season's power to aid in the next one!

You can also do solar refrigeration with a 2-stage ammonia evaporator/condenser, if you don't have to fight the farmers for the ammonia!

Bob

With a bit of thought I can't see it being that expensive or labor intensive.

In this use case it would be for in situ usage so the design is quite different from a commercial ice seller.

You can probably get away with a big tanks of water and a ethylene glycol aka antifreeze system to cool the water. In winter you freeze the tanks in summer you do the reverse. Old chest freezers could be used.

The expense is limited to the cost of pumping the antifreeze.
Considering you have all winter to freeze the ice you could easily use wind power to power the pump. In summer a electric pump powered via solar could be used.