Batteries

Canadian Rainbirds wrote:
I have noted that the 6 volt GC2 batteries at Costco here do not list the AH on the label.

That is what I have. Did research on Interstate Battery site. Found GC2 with Rc of 107 and AH of 208. I did notice that also list RC only

Canadian Rainbirds wrote:


I hope that's a typo! GCs are 6 volts!

Poor guy has enough stuff to figure out as it is!

Indeed it was..the two keys are side by side after all and I make many typos.. A whole lot more than ever make it to the printed page.

I have noted that the 6 volt GC2 batteries at Costco here do not list the AH on the label.

Think I have it surrounded. The GC2 batteries I have are 208 AH, after long search. Good to go.

Grumpa wrote:
I'm back and confused. I have 2 Golf Cart batteries at 107 amps. Series 12 volts, 107 amps. Two 12 volt batteries at 114 amps. Parallel, 12 volts 228 amps. Am I correct? Why would 2 6s be better at 107 amps than 2 12s at 228 amps. Don't you want a high reserve capacity? There is no cranking in the application, just battery draw usage. Confused Thanks bare with me.

You are mixing up the numbers. Forget about reserve capacity. That number is a measurement in a starting battery for cranking the engine.

For deep cycle use, the standard measurement is how many amp hours are there in capacity when discharged at the 20 hr. rate. Starting or hybrid marine batteries rarely have these rates on the battery. It makes it confusing for comparison to true deep cycle batteries.

Your 6V GC batteries each have a capacity of over 200 amp hours. When connecting them in series, the voltage doubles but the capacity is the same as one battery.

If you connect two BCI Grp. 24 12V batteries in parallel, the voltage remains 12V but the capacity doubles. Typical Grp 24 hybrid marine battery will have a capacity of around 80 amp hours. Two of them = 160 amp hours.

The 6V batteries are superior for the application.

GC2 (golf car batteries) generally have 208 to 240 amp/hours at a 20 hr rate. GC2 is 6v so you add voltage not capacity.

Common Group 27 12v battery is 100 to 110 amp/hours at the same 20 hr rate. 12v goes in parallel so you add capacity and get 200 or 220 amp/hours.

I think you might be mixing in RC (reserve capacity minutes) that is a very different measure of capacity.

Golf batteries are made to be deep cycled. 12v is often a combo deep cycle/starting battery. Yes in the end capacity is about the same. However the GC2 is generally more tolerant of deeper cycling and other abuse.

Your existing batteries appear to be Group 24 with about 80 amp/hours or 160 total.

www.trojanbattery.com/product/t-105/ GC2

www.trojanbattery.com/product/24tmx/ Group 24

www.trojanbattery.com/product/27tmx/ Group 27

Note the weight.... more lead = more capacity.

I'm back and confused. I have 2 Golf Cart batteries at 107 amps. Series 12 volts, 107 amps. Two 12 volt batteries at 114 amps. Parallel, 12 volts 228 amps. Am I correct? Why would 2 6s be better at 107 amps than 2 12s at 228 amps. Don't you want a high reserve capacity? There is no cranking in the application, just battery draw usage. Confused Thanks bare with me.

Grumpa wrote:
Game over Golf Cart batteries. Good to go on maiden voyage with new to us TT, as soon as my DW recovers from knee replacement. Long road ahead for her. We will make it. Thanks again

I have had both of my knees replaced and they are as good as new. Make sure she does her exercises, especially flexing her knees to get her heel as close to her rear as she can. I wish her all the best.

Game over two golf cart batteries. Good to go now. Wait for my bride to heal from knee replacement so we can make the maiden voyage in our new to us TT. Thanks again.

Game over two golf cart batteries. Good to go now. Wait for my bride to heal from knee replacement so we can make the maiden voyage in our new to us TT. Thanks again.