Just wanted to share a bit of information that I had trouble finding about GC8 golf cart batteries. They will easily crank a 12V71 in a 32 volt bank of 4. I was told they would but only found one person who had done it. I am in Florida so I can't attest to cold weather performance. The 8V21's on my port bank have went from $250 each to almost $600. The 8V195 are now $420 each. Sams club has the GC8's made by East Penn Mfg./Deka for $106 each. So I could buy four of these for $20 more than one of the 8V195's made by the same company. At current dollars I can replace the GC8's four times before I am at the cost of one set of the others. Since this is the house bank I like that they are deep cycle. I will probably keep the larger batteries on my starboard engine and use the parallel switch if the GC8's ever let me down.