Thor Forums

[Beau388]

Originally Posted by lwmcguir

Simple math
You get more lead with two 6 volt using standard batteries

It is the amount of lead in a lead acid battery that gives it rating nothing else. It doesn't matter if it is a 2 volt cell, two 2 volt cells, three 2 volt cells, four 2 volt cells, etc. The chemistry is the same. Now are better design batteries for specific uses, yes. A starting battery is meant for starting a vehicle. A deep cycle battery is meant for golf cart use (or an electric vehicle). A combination battery will work in both applications, but not as well as a battery made fro that specific purpose. 6 and 8 volt deep cycle batteries are the cheapest because the make up 40% of the deep cycle market as they are supplies to golf carts. Textron (E Z GO) buys over 2 hundred thousand GC-8 and 1 hundred thousand CG-2 batteries a year. Thor MC plant 750 (Thor's largest vehicle plant) buys approximately 4.500 group 27 12 volt combination batteries a year.

Go to the Trojan battery site and compare the weight of 12 volt batteries and 6 volt batteries. IE 12 volt group 27 Trojan is listed at 115 a-h at 61 lbs. A GC-2 (T-105) is rated at 225 a-h at 62 lbs. So 2 GC-2 weigh 124 lbs (1.81 a-h per lb)and 2 group 27 weigh 122 lbs (1.88 a-h per lb.) So actually the group 27 batteries have slightly more a-h per pound of battery but the CG-2s are slightly cheaper on the Internet.

I do agree that AGM batteries are generally better than flooded especially for starting batteries, but unless you consider the life cycle cost, flooded batteries are a better value. Actually I find combination batteries fill all my needs for house batteries (group 29).