Charging time ?

Help neded here ??

Lent a work collegue my portable solar panels, on a fishing trip last week, and he recons the panels were a little disappionting.
They had 2 * 80 watt deep cycle battery's, swapping them day about on the charger an on their 60 lt fridge, the next day.

How long would it take me to charge an 80 amp deep cycle battery, that has been run down to 11.5 volts....?

Using a 120 Watt monocrystaline solar panel, with say 6 hrs sunlight

Is there a formula ?

Cheers
Bucky

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