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Open Roads Forum  >  Tech Issues

 > Anyone know if Costco is still selling Golf Cart Batteries?

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crcr

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Posted: 05/22/12 06:19am Link  |  Print  |  Notify Moderator

Almot wrote:

Gau 8 wrote:

True! When you connect two 6V batts rated at X amp/hrs in series you get 12V and X amp/hrs--not 2X amp/hrs.

You do, however, get twice the power. I.E. twice the watts of each 6V batt by itself.

Twice the power than one 6V at X amp/hrs, yes. Two 6V batts at X amp/hrs each would be capable of the same power as one 12V batt at X amp/hrs.


I bought two 220 amp hour 6V GC batteries, which of course will be wired in series to produce 12V. So is it correct that I now have a total of 220 amp hours of 12V power available to me?

RoyB

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Posted: 05/22/12 07:59am Link  |  Print  |  Notify Moderator

Mena661 - Its always the same - the batteries I really want cost too much hehe.

I am still pondering my two battery banks one in the back of the truck bed and the other on the trailer tongue. My gut tells me to go with the 12VDC 150AH Trojan T1275.

The very empty dust filled with cob webs billfold is going to tell me to go with the GC2 CostCo/Sams Club 6V batteries.

I know I will be just fine with 6V batteries but I can gaurentee I will get caught somewhere with one 6V battery failure and be dead in the water since I cant make 12VDC with just one good 6V battery.

Hopefully when this happens I have both battery banks with me...

I think I got everyone mixed up (probably me as well) trying to show what happens to RESERVE POWER (RC) when connecting two 6V batteries in series. The 6V batteries all have a real large reserve power rating (447 min or 7.45 hrs at 25AMPS for the T105s)

That is a long time to be able to produce power and not drain the battey down below its 50% charge state. Roy Note: After checking with google it appears I am wrong with this statement - Google says "RC means this is the number of minutes a fully charged battery at 80 ° F will discharge 25 amps until the battery drops below 10.5 volts." So my statement above of 50% really should state 0% Charge state. I really need to know how many minutes it will discharge 25 AMPs unitl the battery drops below 12.02 volts or 50% charge state. This is when I need to re-charge again.

The 447 minutes rating made everyone think I was doubling the 225AH rating number I guess when connecting two 6V batteries in series.

I did find these two charts from Interstate battery that explains it ok for me to understand showing what happens with DC VOLTS, AmpHours (AH), and Reserve Power(RC) ratings when batteries are connected in series or parallel. The AH rating of the two batteries will be treated the same as the CCA ratings shown.


(source Interstate Batteries)

No way can I afford $880 for four 12VDC T1275s. $360 for four 6VDC GC2s looks alot easier to come up with. But I will suffer with "give me more power Scotty" as Capt Kirk would say.

* This post was last edited 05/22/12 09:15am by RoyB *   View edit history


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mena661

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Posted: 05/22/12 11:05am Link  |  Print  |  Notify Moderator

crcr wrote:

So is it correct that I now have a total of 220 amp hours of 12V power available to me?
Yes!

RoyB wrote:


No way can I afford $880 for four 12VDC T1275s. $360 for four 6VDC GC2s looks alot easier to come up with. But I will suffer with "give me more power Scotty" as Capt Kirk would say.
I simply traded a generator for battery capacity. Our campsites are in cooler weather and when we do go to a hot weather campsite we go to an RV park with full hookups. We only do 3-4 days a pop while camping so no recharging needed while we're out. With the amount of power we're using, we could lose a battery and finish the trip without any extra conservation efforts (IOW continue like nothing happened).

* This post was edited 05/22/12 11:38am by mena661 *


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BFL13

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Posted: 05/22/12 11:16am Link  |  Print  |  Notify Moderator

The 20 hr rate should take 10 hrs to get to 50%. Same with RC. Half the time.

However there was some "confusion" about that when doing actual timed load tests I was running where the supposed 50% indicator for SG didn't coincide quite right. It is not all as linear as they say it is, or my batteries are wonky or I am, but you can go with half the time to 50% as being close enough for government work, unless close accuracy matters.


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MEXICOWANDERER

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Posted: 05/22/12 11:18am Link  |  Print  |  Notify Moderator

My comments were over abbreviated. My fault.

Go to the warehouse manager and explain your logic. It would be undeniable.

Almot

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Posted: 05/22/12 01:34pm Link  |  Print  |  Notify Moderator

Alright, I see all top guns are here, so I'll be brief.

Agree - partially - with what RoyB said about more "power" (i.e. more RC). Good picture by Interstate. With two 6V in series 220AH each you have 440 minutes RC and 110AH @12V. With one 110AH battery you have RC - don't remember, about 200 minutes - and same 110AH capacity.

Now, I don't know how really important is RC - this is a high-current measure, not everybody is running 25A current. Probably - important, as two GC 6V 220AH each have more "stuff" inside anyway, judging by total 120 lbs weight VS 70 lbs weight of one 12V 110 AH, so 2 6V should be able to take more abuse.

Money-wise... Not much difference. Two Costco 6V cost $180, one Trojan 12V 110AH cost $150-250, and one Trojan 12V 150 AH - about the same $150-250. Depends where you buy and how much is shipping (sometimes it's free, but mostly not).

Edit-PS:
Comparing the cost of two 6V vs one 12V, don't forget to count extra $25 for one more core fee and a pair of battery cables in case of two 6V, unless you have those cables already.

* This post was edited 05/22/12 02:05pm by Almot *

mena661

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Posted: 05/22/12 02:03pm Link  |  Print  |  Notify Moderator

Almot wrote:


Now, I don't know how really important is RC - this is a high-current measure, not everybody is running 25A current.
I would agree because with enough capacity, RC won't matter much anyways (because you'll have more RC). Not to mention, like you said, not too many people running 25A of current for hours on end.

Almot

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Posted: 05/22/12 02:49pm Link  |  Print  |  Notify Moderator

Don't know what I was thinking about in the previous post.
Two 6V GC batteries 225 AH each = 225 AH capacity at 12V. To get the same capacity with 12V batteries, you need two 110V batteries at 12V at total cost at least $300. So, money-wise two 6V is a lot cheaper.

Not so much with RC, because two 12V batts in parallel will have 380-400 minutes RC, i.e. pretty close to 440 minutes of two 6V.

arcsum68

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Posted: 05/22/12 02:51pm Link  |  Print  |  Notify Moderator

I should have known better, having read the debates, but this thread sure has deviated quite a bit from the question in my original post.

That's what makes this a good forum!


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RoyB

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Posted: 05/22/12 03:33pm Link  |  Print  |  Notify Moderator

Actually at the 12VDC level 25amps isnt a whole lot. That is just something drawing 300Watts...

You can add a lot of small current items and get to 25AMPS running from the 12VDC battery. Before LED lights you could draw 12AMPs DC real quick just running twelve ceiling lamps (six dual sided ceilling lamps). I could load down a 300W Inverter rather quick of 120VAC items which would be a 25AMP DC Load...

This is also very interesting...
A T105 6V Battery is rated at 225AH and has a RC or 447 minutes @25AMPS.
Connecting two in series will give me 12VDC at 225AH with a RC or 447 minutes.
Connecting two of these 6V groups in parallel will give me 12VDC at 450AH with a RC of 894 minutes... This will only cost $580... these four batteries weigh 248 lbs.

A T1275 12V Battery is rated at 150AH and has a RC of 280 minutes@25AMPS.
Connecting "three" in parallel will give me 12VDC at 450AH with a RC of 840 min.
This will cost $660... These three batteries weigh 246 lbs

So which battery bank is best...
The T105s will run 12VDC at 450AH with a RC of 894 minutes running 25AMPS
The T1275 will run 12VDC at 450AH with a RC of 840 minutes running 25AMPS

The only difference here for me is COST haha...

Of course you can get four GC2 batteries with just a little less difference is specs for $360.

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