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Well it depends on the size & wattage of your deep freezer. The watt is a unit of power. That means the amount of energy used by an appliance in 1 hour.
So if your deep freezer is of 300 watts, then you'll need 2 panels of 180 watt each.

Minimum 3kw off grid system
Let's calculate maximum current that will be delivered by 180 watt loom solar.
(For 12v battery connection)
Current=wattage÷voltage=180÷12=15A. … see more
Let's calculate maximum current that will be delivered by 180 watt loom solar.
(For 12v battery connection)
Current=wattage÷voltage=180÷12=15A.

(For 24v battery connection)
Current=180÷24=7.5A

Now calculate time that will be taken by solar pannel to charge the battery .
(For 12 volt battery)
Time=160÷15=10.67Hrs.
(For 24 v battery)
Time=160÷7.5=21.34Hrs

Now you have understood the basic calculations for purchasing pannels.
In my opinion 180w pannel is better choice but not best for 12v battery charging. It would be better using 200w to 360w pannel because pannels won't get sunlight at its maximum whole day.

Charging current must be between 14 to 20 Amp. for fast and better charging. see less
Let's calculate maximum current that will be delivered by 180 watt loom solar.
(For 12v battery connection)
Current=wattage÷voltage=180÷12=15A.

(For 24v battery connection)
Current=180÷24=7.5A

Now calculate time that will be taken by solar pannel to charge the battery .
(For 12 volt battery)
Time=160÷15=10.67Hrs.
(For 24 v battery)
Time=160÷7.5=21.34Hrs

Now you have understood the basic calculations for purchasing pannels.
In my opinion 180w pannel is better choice but not best for 12v battery charging. It would be better using 200w to 360w pannel because pannels won't get sunlight at its maximum whole day.

Charging current must be between 14 to 20 Amp. for fast and better charging.

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