I think you are extremely far off the mark with that assessment. This is the kind of question, by the way, that AI can be great at answering. Here's what ChatGPT has to say about it (mashing your original question together with later added details):

I asked:
What size power bank would I need to run a medium upright freezer of 14 cubic feet and a small chest freezer of 7 cubic feed for a day?

ChatGPT said:

To determine the size of the power bank needed to run both a medium upright freezer (14 cubic feet) and a small chest freezer (7 cubic feet) for a day, you need to calculate their combined daily energy consumption in watt-hours (Wh) and then size the power bank accordingly. Step 1: Estimate power consumption

Freezers typically use between 100-400 watts depending on their size and efficiency. To get an estimate:

Medium upright freezer (14 cu. ft.): Roughly 300 watts
Small chest freezer (7 cu. ft.): Roughly 200 watts

Step 2: Calculate daily energy consumption

The freezers won't run continuously; they usually cycle on and off (about 1/3 to 1/2 of the time). So, let's estimate they run for around 8-12 hours a day.

Upright freezer: 300 watts × 10 hours = 3,000 Wh
Chest freezer: 200 watts × 10 hours = 2,000 Wh

Step 3: Total energy required

Add the energy consumption of both freezers:

Total energy: 3,000 Wh + 2,000 Wh = 5,000 Wh (5 kWh)

Step 4: Accounting for inefficiencies

Power banks and inverters lose energy in the conversion process. Assume about 15-20% inefficiency.

Total required capacity = 5,000 Wh ÷ 0.85 = 5,882 Wh (rounded to 6,000 Wh)

Step 5: Choosing a power bank size

You would need a power bank with a capacity of at least 6,000 watt-hours (Wh) to power both freezers for a day.

Alternatively, you can look for a power bank with this specification in terms of kilowatt-hours (kWh), which would be 6 kWh. Considerations:

Check the specific wattage of your freezers in their manuals for a more accurate estimate.
The power bank should also be capable of delivering the required watts continuously. For instance, if both freezers run at the same time, you’d need a power bank that can handle a combined load of 500 watts (300 W + 200 W).

Notably this answer failed to mention the startup draw, which can often be a big deal for refrigerators and freezers (also A/C handlers, well pumps, etc.). That won't affect the overall necessary power bank capacity much, but it will require a sufficiently sized inverter and such, to avoid simply tripping a breaker/fuse and turning off the power bank whenever those big draws kick on.