The short answer is that it depends.
Besides the useage, the calculation involves how many amp-hours are in your battery bank - What size 6-volts are they?
Also, can you clarify the term "fully charged"? When was the bank last charged and how did you measure the volts (trailer panel lights, multimeter, etc)?
Sorry for all the questions but more info is needed.
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Scott
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD
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