Without going to a solar calculator to give an accurate answer, off the top of my head your 300w solar should charge a pair of T-105's discharged to 50% (around 110ah) in 6 hours at maximum panel output (21ah). That is at ideal conditions, something that one doesn't always have.
You should always have a backup generator when relying only on solar.
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Bill
2015 Ram 1500 Ecodiesel
2015 Cougar 26RBI
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