Good questions. I usually figure the watts of solar should be about equal to the AH of the battery(s) being charged. I have two 200AH 6v GC2s and 200W of solar panels.
When camping I usually see a full power restoration before noon on a bright Florida day.
After noon this time of year It often clouds up/rains.
If that 55W for the TW from the back panel or did you measure it ? I have a 32"(class) Hitachi that says 60W on the back and actually pulls 33-34W (measured) in practice (volume and brightness at normal levels).
But what I would suggest is to create an energy budget (spreadsheet) of what you may use and for how long (e.g. takes my Keurig 3 minutes at 64A of 12v to make a cuppa. This takes 24 minutes of bright solar to recover. Then determine what you need to either recover each day or reach the end of your trip before discharge below usability (50% of capacity is a good guesstimate for a true deep cycle battery, only 30% for an automobile battery is better)
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Looking for a 24/17 in or near Florida.
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