This can dramatically extend how much your battery can provide and provide
Solar panels are are rated in W (Watts).
Cuba gets about 5h of sunshine a day.
So a 100W panel will produce 500Wh in a day. A 200W panel produces 1000Wh
Two panels produce twice as much
So four 200W panels can produce as much as (4 x 200W x 5h) 4000Wh a day, or enough to recharge a 2000Wh battery TWICE in a day
Again there are inefficiencies so you will only see 80-90% of the rated output
Clouds or other shading dramatically reduce the output.
So two 200W panels easily produce 1600Wh of power which is enough to run the fridge through any power outage (if the sun shines)
600W of solar panels will make a huge difference to the usefulness of a battery
But there is a maximum input power for all batteries
You need to look at the battery to see the maximum power (in Watts) that you can connect. It is typically under half of its rated power output. Look at the Batteries and Sizing
There are also ratings for maximum voltage and current. Briefly:
When you connect panels in parallel, the current adds but voltage stays constant
When you connect panels in series, the voltage adds but the current stays constant
No matter how you connect panels, the power ratings add
If you buy the panels and the battery from the same place, they will make sure that the power, voltage and current all match the battery and how to hook them all up