Ideas to use chiller panels?

I was donated chiller panels - about 25m2 worth. 100mm xps panels.
We're starting a market garden. I have looked into building a proper chiller out of them but:
- they are about 50% of the insulation required for running something like a coolbot
- we don't have power (and don't anticipate having the necessary money to build a full solar set up for a while)
- I have investigated the costs of doing so, doubling the insulation up, and I wouldn't save much/any money vs buying a second hand unit, which will likely be built and designed better than I could anyway.

It won't be super ideal, but I was thinking of building an insulated room that could be placed in a shady spot for medium term storage of things like Pumpkins, Onions and Potatoes. As well as a seed storage room. However these veges that don't require the usual 0-4c storage range all have different ideal temperature ranges and humidity ranges (seeds want drier than veges, onions want cooler than pumpkins..).

I figure it wouldn't be too expensive to have a small solar powered ventilation unit.

Is it a waste of time? Or will I still have a useful-if-not-ideal storage space?

And if not, how would you go about it? Would you have other creative uses for the panels?

I'd vote if you are just starting out, build a room that can be used for whatever now, and might be useful later. Don't try to make it functional till you know what you need, and have resources to make it work. In the meantime, a random usable space is always a good thing. You don't know what you will need in a year or three.

:D