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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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08-05-2014, 09:28 AM | #11 |
Gone Wild
Join Date: Feb 2013
Location: SC
Posts: 152
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Re: Battery life question
Cart was here in SC. I bought it from a guy who was upgrading to a Polaris Ranger UTV. He used the cart for hunting clearly as it was covered in mud, debris, etc. so I am sure he didn't follow all best practices for battery maintenance.
Will have the other details shortly...thanks all. shrp |
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08-05-2014, 09:31 AM | #12 |
Gone Wild
Join Date: Feb 2013
Location: SC
Posts: 152
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Re: Battery life question
by the way, anyone have any recommendations on how to capture voltage reading while the cart is running? do i need to take the seat off or can i attach to battery meter in cab area of cart for accurate reading? (analog color scale meter without any numeric values)
shrp |
08-05-2014, 09:44 AM | #13 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Battery life question
Quote:
Low pressure tires (Max inflation pressure under about 10PSI) tend to have more rolling resistance, so more amps are needed to turn them, shortening the range and the top speed reachable is lower, but are great for driving through mud and sand. High pressure tires (Max inflation pressure over about 20PSI) tend to have less rolling resistance, so they have greater speed and range, but will spin on wet grass if you throw too much torque at them. The trick is finding the best tire type and tread pattern for your application. |
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08-05-2014, 09:51 AM | #14 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Battery life question
Quote:
Attach the test leads to the main Positive and Negative battery pack terminals, or individual battery terminal and run the leads out from under the seat. |
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08-05-2014, 11:04 AM | #15 |
Gone Wild
Join Date: Feb 2013
Location: SC
Posts: 152
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Re: Battery life question
The battery pack was at 39v upon 1st reading. (charged last night and not sure what time it finished this morning. It's normally 38.7v after sitting a few hours after charge) Each battery tested at exactly 13.0v. (usually 12.8v - 12.9v) Hooked up the DVM and ran it down the road about 2 miles and then back. Heading out it was pretty consistently registering at 36.6v and dropped as low as 36.0v going up a decent little hill. On the way back it was consistently running about 36.1v with a low of 34.2v coming back up same hill. Total distance travelled was right at 4 miles. I could already tell performance started dropping quickly near the end. I bet I couldn't drive it another 2 miles before it stops running. Pic of the battery is attached.
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08-05-2014, 11:30 AM | #16 |
Master of All Things
Join Date: May 2013
Location: West Columbia, Texas
Posts: 17,890
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Re: Battery life question
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08-05-2014, 12:29 PM | #17 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Battery life question
That is made by GND, which is a division of Exide.
The 13.5V-13.8V mentioned by he electrician, is the float charge voltage it is supposed to be maintained at. I can find no info as to what the "At-Rest" voltage should be at 100% SoC, but based on my Exide cart batteries, I suspect it would be about 2.128VPC or about 12.77V for a 12V battery. I did find a spec that said the on-charge voltage should not exceed 2.40VPC (14.4V for a 12V battery) and the charger you are using will exceed that voltage. Your charger is designed for wet cell rather than AGM and goes up to about 2.5VPC or 15V for a 12V battery. I also found a spec that says that battery will produce 300W per cell for 15 minutes when the battery is taken down to 1.75VPC at 25°C (77°F). That indicates it will deliver 50A for 15 minutes. For comparison. The 12V battery used in some of the newer 48V carts is a Trojan T-1275 (12V-150AH), which will deliver 56A for 90 minutes when take down to 1.75VPC at 77°F. Based on those numbers, my guess is that the GNB S12V300F would effectively be a 25AH battery. Running 6 of them in series/parallel would yield a 36V-50AH battery pack, while the standard 36V golf cart battery pack is 225AH. If your cart was as efficient as mine (and that is a big if), and those batteries were in tip-top shape, you would get about 6 miles on that battery pack vs the 30 or so I get with my battery pack. |
08-05-2014, 12:39 PM | #18 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Battery life question
Quote:
It doesn't say what the discharge rate is for the 75AH rating, but even if it was at a 100 hour rate, the AH rating is higher than I expected and the pack ought too be giving more run time than it is, so the batteries might be sick. Even with 75AH and two sets in parallel, it is only 150AH and a standard 36V pack is 225AH, so the range only would be 2/3 of a standard pack at best. |
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08-05-2014, 12:55 PM | #19 | |
Master of All Things
Join Date: May 2013
Location: West Columbia, Texas
Posts: 17,890
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Re: Battery life question
Quote:
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08-05-2014, 05:22 PM | #20 |
Gone Wild
Join Date: Feb 2013
Location: SC
Posts: 152
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Re: Battery life question
y'all are just impressive. thanks for all the great, quick responses. JohnnieB, I am positive my cart isn't as efficient as your's is. I have been considering upgrades for awhile but just haven't pulled the trigger because I can't decide whether to sell the cart and buy bigger or upgrade what I have to a more capable model. I had a feeling when I bought the 36v cart it wasn't going to do what I want but am not real sure my expectations aren't that of a UTV or ATV. Knowing now that I can expect good performance out of a good set of batteries, what other steps can I take to get the range, torque, and moderate speed that'll meet my needs with this cart? Thanks again for all the great replies.
shrp |
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