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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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10-16-2017, 04:36 PM | #21 |
Getting Wild
Join Date: Sep 2012
Location: South FL
Posts: 103
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Re: Suggestions for next upgrade
I'm thinking of converting to 42v or 48v myself so I'll be following this as well. If you're going to 48V then do 6 8v batteries.
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10-16-2017, 05:54 PM | #22 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Suggestions for next upgrade
Nearly everything you do to a cart is a trade off of some kind, so you have to choose what best suits your needs or desires.
8x6V vs 6x8V: You can get more range with 8x6V, but it weighs more than a 6x8V, so you lose performance. Typically, it is akin to have an additional 120lb passenger onboard all the time. Attachment-1 is a weight chart for 48V packs using Trojan batteries. A standard 36V using T-105 batteries is the baseline for both weight and range. As you see, a 48V pack using T-875 batteries (8V-170AH) has about the same amount of stored energy (range) as the 36V pack using T-105 (6V-225AH) batteries and is only slightly heavier. Yes, 8 six volt batteries will fit under the seat of a PDS cart, but it is a tight fit. If you relocate the controller, it is easier. As for motor selection: You are planing on installing tall tires, which require more torque to turn and are part of the final drive ratio, so you the taller the tire the less torque available where rubber meets road. Attachement-2 is a chart showing speed gain and torque loss vs tire height. The MOT-B3 mentioned is wound for higher than stock speed (IE: spins fast than stock with same voltage applied) with 10% more than stock torque due to having a longer case length. With 20" tall tires, the net torque gain would be ZERO and the cart speed will be 28.7MPH mathematically, but the motor might not have enough torque to reach 6000RPM. In a nutshell, you should consider a motor whose torque offsets the torque loss due to tire height. Since you are planning the have a rear seat, the torque ought to more than offset the tire height torque loss. |
10-16-2017, 08:03 PM | #23 | |
Getting Wild
Join Date: Jun 2017
Location: New Strawn, KS
Posts: 120
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Re: Suggestions for next upgrade
Quote:
What motor would you consider? I did not see which motor on Scotty’s website that had more torque. Is lithium even better? |
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10-17-2017, 08:13 AM | #24 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Suggestions for next upgrade
Quote:
2. Yes, but $$$$$$$$$$$$$$$ and still evolving for golf carts. |
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10-17-2017, 08:55 AM | #25 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Suggestions for next upgrade
Quote:
http://www.ebay.com/itm/232523999569 He even has some used ones at a lower price. http://www.ebay.com/itm/232503957466 I bought 32 cells and a BMS/Charger on sunday, and yesterday I bought another 16 cells. I am not affiliated with this seller. I just wanted to pass on my source of lower prices for LiFeMnPO4 cells for others to take advantage of while they are still available. He had about 50 of the 100 AH cells left as of yesterday when I bought the second batch. Bob |
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