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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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