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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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07-12-2018, 05:03 PM | #141 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Converting to Lithium
Quote:
Ironically, 48V is easier on the motor than 36V is because heat kills motors and it takes 1/3 fewer amps to generate the same amount of torque. The efficiency of a sepex motor ranges from about 60% up to about 85% and the amps not converted to torque are converted to heat. The tricky part is that the heat is produced at a rate equal to the square of the amps, so doubling the amps through the motor quadruples the amount of heat generated!!! Plan ahead and get a controller, solenoid and cables that will work with 36V now and will also work with a higher voltage later. (Cables aren't voltage specific, but 8V batteries have both terminals on same side, so longer cables are needed to connect them together.) |
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07-18-2018, 04:53 PM | #142 |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,204
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Re: Converting to Lithium
BTW.....FWIW......and not to re-direct the flow of the post....BUT......
A while back in the post I found where a 100amp "pack" could be had for $3,225. That link sent the 'puter to Elite Power Solutions. When I click that link now....the page is not there. However, this link https://www.elitepowersolutions.com/...attery-system/ does take you to a page where it states they have a "drop 'n drive" unit(s) for EZ-GO, and Club Cars. However, when I go to their listed distributors, most or all out west, I found only one distributor that has it listed on their web site, and there is no price listed. I post this for general "yeah and" discussion only. |
09-30-2018, 01:54 AM | #143 |
Not Yet Wild
Join Date: Jan 2017
Location: Gilbert, AZ
Posts: 5
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Re: Converting to Lithium
Hello, what a fantastic thread. I have a 2004 ezgo shuttle that has 4 rows. Long story short my batteries are almost toast and I would like to dive into the Lithium world. I am looking at utilizing a local guy that I'm assuming Rwalsh77 has also used. My question is how many sections/blocks of 48AH chevy volt batteries would I need for such a heavy cart?
Thanks again for the valuable information!! |
09-30-2018, 07:59 AM | #144 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,121
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Re: Converting to Lithium
I would go with a 96AH pack if you use Volt batteries.
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09-30-2018, 08:57 AM | #145 |
Card Carrying Old Fart
Join Date: Feb 2012
Location: Kentucky
Posts: 706
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Re: Converting to Lithium
I had something interesting happen recently. I have the 2300 wh turn key pack I got from EVBatterycenter.com. I got their 4a charger and was told that it would not engage if I let pack voltage drop below 36v so I tried to keep it above 38v. Last week it was raining and I got in a hurry. Pack voltage was 37v. I drove a 1/4 mile to where I park it and voltage was 34v. Being concerned about the charger I found another lithium charger that would engage at lower voltage. I got to the cart this week and voltage showed 29v. I hit the pedal and cart moved but pretty slow. After a couple hundred yards it would not move and I had to push it to where I could charge it. I plugged the 1.8amp charger in and it showed charging and voltage immediately started rising. I called a bud and asked him to check on the charger periodically. Yesterday it hit a termination voltage of 41.7v and charger shut off.
I talked to Neli at EVbatterycenter and was told these packs do not have a straight discharge curve and the voltage pretty much drops dramatically after 37v. Now you tell me. Is there such a thing as a SOC chart for lithium battery packs? |
09-30-2018, 09:14 AM | #146 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,121
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Re: Converting to Lithium
Yes there is a SOC chart. I made my own and it's included in my display on the dash. I got the curves from the Nissan Leaf battery info and coded it up my self. You should never let it get that low though or you will damage the cells. I limit mine to about 3.6V per cell minimum which is plenty conservative. As you found out it drops like a stone when it gets much lower than that.
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09-30-2018, 09:29 AM | #147 | |
Card Carrying Old Fart
Join Date: Feb 2012
Location: Kentucky
Posts: 706
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Re: Converting to Lithium
Quote:
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09-30-2018, 09:36 AM | #148 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,121
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Re: Converting to Lithium
My cart was originally 48V I have a 14 module pack which is roughly 56V fully charged. It would be at 50.4V when the cells are at 3.6Volts.
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09-30-2018, 09:39 AM | #149 | |
Card Carrying Old Fart
Join Date: Feb 2012
Location: Kentucky
Posts: 706
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Re: Converting to Lithium
Quote:
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09-30-2018, 09:44 AM | #150 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,121
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Re: Converting to Lithium
For 10S 36V would be an ok minimum. Your max is going to be a little over 40V if you fully charge the 10S pack. (full charge is 4.2V per cell)
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