Vaccine storage backup power

As the second snowstorm of the season descends upon us, we are considering investing in a back up system for our vaccine refrigerator and freezer. Any thoughts on an economical system into which a small practice might invest?

Look at TempArmour. Great for a few days (4 to 7) of power outage.

I was looking at the tesla power packs

I was checking into them as well. They appear to be about $9000 per wall plus installation.

Medi+Products has battery back-up systems. 800.765.3237