This exists for big refrigerated warehouses. By using an appropriate liquid with the phase change tuned for the working temperature you can shift the electricity usage to times with lower cost. That can be because you have your own generation or are just buying market rates that vary.
The poor man's version of this might look like this:
1- Connect your solar panel directly into a big freezer.
2- Fill your freezer to the brim with bottles full of saltwater.
3- Let it run to the coldest temperature possible.
4- Drill two ventilation holes (inlet up / outlet down) and connect to a small fan sucking the cold air where you need it.
Anyone knows something like this?