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Electric golf carts Harley Davidson, Melex, Pargo, Taylor-Dunn and other Misc. Carts. |
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10-22-2018, 05:48 AM | #21 |
Gone Wild
Join Date: Jul 2018
Location: Central Ohio
Posts: 1,720
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Re: Putting the Taylor Dunn on a lithium diet
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10-22-2018, 07:33 AM | #22 | |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,204
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Re: Putting the Taylor Dunn on a lithium diet
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10-31-2018, 09:09 AM | #23 |
Gone Wild
Join Date: Aug 2008
Location: Leander TX
Posts: 166
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Re: Putting the Taylor Dunn on a lithium diet
Picked up another Taylor Dunn and you were right, my cart has been lifted significantly from stock. The new one is LOW. There’s a guy in Kyle TX selling 25 of them for $13 each. He claims ah is only at 30-38, but hey..$13.00. Be a bit of a drive for you, no shipping.
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12-21-2018, 12:24 PM | #24 | |
Gone Wild
Join Date: Aug 2008
Location: Leander TX
Posts: 166
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Re: Putting the Taylor Dunn on a lithium diet
Quote:
Here is test data I took on a single Leaf module from Hybrid Auto Center. This is a brand new module, not used. Cells were balance charged to 4.2V each using an iCharger. I did capacity tests on each 2P set within the module. I used a CBA IV (http://www.westmountainradio.com/pro...oducts_id=cba4). Discharged to 3.0V at 15A (C/4). I got 58.32 and 59.1Ah. These were done after the very first charge. Test plots are here (http://www.colorado.edu/physics/Educ..._module_1a.png) and here (http://www.colorado.edu/physics/Educ..._module_2a.png). As Hybrid Auto's site says, at 3.6V you get about 90% of the full capacity. Cells were balance charged again to 4.2V, then discharge rate tests done on the first 2P set. My setup is sort of crude, but it gets reasonable data. It is a bank of nichrome wires in parallel, a clamp ammeter (1000A DC limit), and a voltmeter. I change the number of nichrome wires, which changes the load and lets me do tests up to 600A (10C for these cells). I did each test for just a few seconds each. (The wires heat up, resistance goes up and changes the discharge rate after a few seconds.) Results look pretty good to me - LVC for these cells is about 2.4V, so they should be able to to well over 10C in short bursts. I didn't feel the need to test any higher (plus I ran out of nichrome wire). One limitation might be the tabs that connect the cells to the external terminals - they are pretty thin. The external terminals got warm, but not overly hot. They are surrounded by plastic, which looked unharmed after the tests. C-rate Amps Cell Voltage 2C 120 3.96 3C 180 3.85 5C 300 3.75 8C 480 3.55 10C 600 3.50 |
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12-21-2018, 05:04 PM | #25 | |
Getting Wild
Join Date: Dec 2010
Location: Pearl River LA
Posts: 83
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Re: Putting the Taylor Dunn on a lithium diet
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Perhaps you could move the batts into the center compartment to counter the front end lifting up? so jealous btw |
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12-21-2018, 05:42 PM | #26 | |
Getting Wild
Join Date: Dec 2010
Location: Pearl River LA
Posts: 83
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Re: Putting the Taylor Dunn on a lithium diet
Quote:
they seem to be about same height as mine, but with more room in wheel wells. Think I can squeeze 20's in there I would just parallel up as many of the lithiums as you can fit in 48v configuration, in the center compartment, in ya older cart. Leave it mechanical speed control. There's a lot to be said for simplicity, and the Lithium makes up for any inefficiency. The electronic speed controls are insanely expensive if it goes out, and its a lot of work to change out. It's already a great looking beast! Mine was built as a SHTF/survivalist cart. With no electronic speed control, that part of it is EMP proof. than just mod the more modern cart to your liking at leisure, using the skills you learned on the older cart. Do you plan on putting solar on them? |
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04-30-2019, 09:27 AM | #27 |
Gone Wild
Join Date: Aug 2008
Location: Leander TX
Posts: 166
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Re: Putting the Taylor Dunn on a lithium diet
Well, it’s been about 6 months since the lithium packs went in. I’m using the cheapest, most advanced BMS I could find, ME. Don’t confuse that with the notion that a management system is not needed, that is absolutely not true. If you are doing the monitoring/balancing yourself, then that means you are the BMS. I was going to build a simple discharge system for cell balancing, but so far my cells are still within 1/100th of a volt from each other. I’ve only been charging to 4.08v per cell, but last night cracked open the charger and bumped it up to 4.15v. Been generally discharging to a minimum of 3.7v, most of the time not even that. Hopefully being so kind to them will get some life out of them, my lowest module is about 38ah and my best is about 43ah. I’ve been running 3 packs in series thinking I would be using the packs for different applications, but it didn’t really materialize. I plan to go to a 48v system and reconfigure to one pack. I bought a newer Taylor Dunn at auction to get the newer electronics out of and of course, the controller is dead. Curtis 1205-202 is currently on the surgery table getting better mosfets, diodes, and capacitors to run 67v since I currently have 16 modules and hey why the heck not. I see very little info out there on modifying controllers, so we’ll see how this goes. I mean, it’s already broken right!? It’s been fun and I’ve learned a immense amount of knowledge about a field I recently knew nothing about. When the swap to 48v+ goes down, I’ll probably get a couple pics up. Till then...
Pb batteries suck! Lol. |
04-30-2019, 11:55 AM | #28 |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,204
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Re: Putting the Taylor Dunn on a lithium diet
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04-30-2019, 12:48 PM | #29 |
Gone Wild
Join Date: Jul 2018
Location: Central Ohio
Posts: 1,720
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Re: Putting the Taylor Dunn on a lithium diet
Well that's pretty cool!
I'm curious if your motor will be able to handle that voltage? Think I remember seeing on here, most of the motors for these carts are designed for 36/48 volt systems. With 60 volts being the "extreme" operating level. What motor do you have? |
04-30-2019, 01:15 PM | #30 |
Gone Wild
Join Date: Aug 2008
Location: Leander TX
Posts: 166
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Re: Putting the Taylor Dunn on a lithium diet
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