pntballty Posted March 12, 2012 Posted March 12, 2012 Hey guys im in need of a new trolling motor battery but im not really sure what specs to look at. Here are two of the batteries im looking at: CCA 675 RC min 180 CA 845 CCA 675 RC min 210 CA 845 I assume im looking at the RC min? There is about a $10 difference. Thanks for the input guys. Tyler Quote
Super User Way2slow Posted March 13, 2012 Super User Posted March 13, 2012 CCA, CA and MCA mean nothing on a deep cycle TM battery. You want to look at the amphour (Ah) or RC min. Then you want to look at what standard they are using to measure them. Usually true deep cycles will not even have the CCA, CA or MCA listed. When they have this, they are usually rated for dual purpose or cranking battery. Dual purpose is ok, but you don't want a cranking battery, they won't handle the deep discharges of the TM but a short time. The standard rating for RC minutes is how many minutes the battery will last with a 25 amp draw. Some companies use a lower amp rating so that can make their RC numbers look better. What that means is if you are pulling a constant 25 amps on your TM, one battery will last 180 minutes and one will last 210 minutes (if they are using the 25 amp rating) A couple of things to consider, is this a battery that's going to be left in the boat all the time or one you are going to be putting in and out. That extra weight for the bigger battery gets to be a handful if you are throwing it in and out every time. The next is how much demand do you put on a battery. If you are only using half the batteries charge, then you could use the smaller battery, but if you want all you can get, then you might want to look at even a bigger group 30/31 with 225 RC min's. 1 Quote
pntballty Posted March 13, 2012 Author Posted March 13, 2012 Thanks for the info, they are interstate batteries that my job sells so I was looking at the dealer catalog, maybe that's why I could see the cca and everything. The smaller one is a group 27 and the larger one is a 29. I looked at the sheet wrong on the price, there is only a 6 dollar difference. The battery will be staying in the boat, I'm leaning towards the group 29. I have a 15ft skeeter and I'm buying a 50lb thrust TM tomorrow. I think the 29 will be good for my application don't you? Thanks again for the help/info Quote
Super User Way2slow Posted March 13, 2012 Super User Posted March 13, 2012 If I was doing what you are about to do, I would get a 65# TM and two 27 batteries. The 24V TM is about 25% more efficient than the 12 volt and you will definetly like that extra thrust, even on your 15' boat. At least get a 55# 12 Volt if they make one in the model you are looking at. Even in a 15' boat, a hard wind can cause you all kind of grief with a 50# motor. Quote
pntballty Posted March 13, 2012 Author Posted March 13, 2012 Well I can get a 50lb for 199 new so that's the main reason I was gonna go with it...they did have some 55's for the same price but I'm not sure if they have any left or not. If they do I will definatly get the biggest they have/I can afford. Quote
Super User Jig Man Posted March 13, 2012 Super User Posted March 13, 2012 W2S is dead on with his info. Since you are opting for a 12volt system you should get the larger battery if you have room for it. It takes more juice to run 12V than 24V. Like stated reserve capacity is the key. In wet cells I like 180+. Quote
pntballty Posted March 14, 2012 Author Posted March 14, 2012 Well I ended up getting the 29 thanks for the help guys! Quote
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