As of All of Fabric 6 version 1.5.0 and 1.5.1, the Cryo Freezer uses 243,000 FE/t, rendering it useless as its maximum charge is 30,000 FE.
This appears to be a copy-paste error in the configs, as 243,000/81 = 3,000 mB is also the tank size of the freezer.

The default value in the Ad Astra configuration file is 18 FE/t, which is much more manageable.

Caused by:

Fix: Change this number to a more reasonable value such as 18.