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I think overall you are gonna be pushing the limits to get 2 days out of 26AH. I run a total of 80AH and I dont have the dew heater yet. Without it I can get about 3 days but once I put a dew heater in I should get maybe 2 days.
Take Brendans idea and stack it together and measure the amp draw from the battery, that will give you a definative consumption to work out what you need.
In most of my constant current application I always add 10% on top of the reading, so if your final flat out reading is 60AH over 2 days then need to buy >66AH battery or batteries.
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