Yes and no, depends on what you want to do with it. Batteries are rated for specific draw over a specific time. A 26AH battery will not hold a 26 amp draw for an hour. What it will do is hold say a 1 amp draw for 26 hours. That is why car batteries are like 500 CCA rated they will supply 500 amps for so many seconds (most fall in the 50Ah rating). So, you need to figure the draw and then how long you want to draw it. From there determine the AHs. If you want to say draw 1 amp for 100 hours you need something like a 100AH rating. At 10 amps the time is reduced to like 10 hours (the higher the draw affects overall rating).
So yes you can put three in parallel and have a 78AH battery, but it will not hold a 78A draw for an hour. May do something like 6-7 amps for 8-10 hours. Make sense? There is a lot more to it (voltage levels, draw rate, temp, charge times, etc..) and these numbers just examples of the relationship between draw and rating. You need to have a little more data to compare the batteries.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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