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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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01-15-2017, 08:33 PM | #1 |
Not Yet Wild
Join Date: Jan 2017
Posts: 3
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Alltrax SPM-48500 Motor Controller no increased performance
I just installed Alltrax spm-48500 controller, heavy duty FNR switch, solenoid and 2 gauge wires in my 2002 ezgo txt series 36 volt cart. No increase in performance. I hooked the computer up and the controller is set up for 500 amps output. Not sure if it is relevant, the monitor when I am running the cart shows that the batteries and motor max out around is around 160 amps.
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01-15-2017, 10:03 PM | #2 |
Gone Wild
Join Date: Sep 2016
Location: Northern California
Posts: 1,300
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Re: Alltrax SPM-48500 Motor Controller no increased performance
That's pretty odd. I've got a 2001 txt, Series, 36v. When I put the 48500 in I gained about 4 mph, and got a nice increase in torque. Have you tested your pack, along with each battery? What controller did you have before? What kind of speed before and after? Stock motor?
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01-15-2017, 10:40 PM | #3 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Alltrax SPM-48500 Motor Controller no increased performance
Dang, your batteries must really suck.
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01-16-2017, 01:13 AM | #4 |
Voltaholic
Join Date: Dec 2013
Location: Close to Navasota Texas
Posts: 934
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Re: Alltrax SPM-48500 Motor Controller no increased performance
Yup, your batteries are dead! Might as well make the jump to 48 volts!
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01-16-2017, 09:50 AM | #5 |
Not Yet Wild
Join Date: Jan 2017
Posts: 3
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Re: Alltrax SPM-48500 Motor Controller no increased performance
I have a stock motor and had the stock controller before the 48500 was installed. Batteries are showing 37 volts. Previous owner said batteries were only a year old Duracell. Thanks
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01-16-2017, 10:06 AM | #6 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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Re: Alltrax SPM-48500 Motor Controller no increased performance
Use an in dash battery meter or attach a handheld meter to the pack and see what the pack voltage is under a full load ( while under hard acceleration or driving uphill)
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01-16-2017, 10:18 AM | #7 |
Gone Wild
Join Date: Jul 2010
Location: Peachtree City, Ga.
Posts: 2,759
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Re: Alltrax SPM-48500 Motor Controller no increased performance
Changing to a higher amp controller will not in itself increase the speed of a series cart if that is what you were expecting. With the increased amps available you can do things that will increase speed like changing the gear ratio with gears or tire diameter. This is different than sepex carts where frequently a controller change increases both speed and torque. This is well documented in this forum. Here is just one reference:http://www.cartsunlimited.net/tech-help-.html
If your batteries are on the way out, might be a good time to think about 48v. This will be a significant increase in performance in both torque and speed. I have experienced it myself. |
01-16-2017, 10:50 AM | #8 |
Not Yet Wild
Join Date: Jan 2017
Posts: 3
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Re: Alltrax SPM-48500 Motor Controller no increased performance
Thanks
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01-16-2017, 12:22 PM | #9 | |
Gone Wild
Join Date: Sep 2016
Location: Northern California
Posts: 1,300
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Re: Alltrax SPM-48500 Motor Controller no increased performance
Quote:
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01-16-2017, 02:03 PM | #10 |
Gone Wild
Join Date: Jul 2010
Location: Peachtree City, Ga.
Posts: 2,759
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Re: Alltrax SPM-48500 Motor Controller no increased performance
Yea, I saw that in your earlier post. In your case something else must have also changed. Maybe some week spot was fixed with your upgrades and refurbishment. Electric carts are sensitive to rolling resistance. Did you replace bearings? Change tires and or tire pressure? New brakes or brakes properly adjusted now? Sometimes tire pressure alone is good for 1-2mph. New tires with bigger diameter? This effectively changes the final drive ratio. Did you use the same phone/app/GPS or whatnot to measure speed before and after? Possibly week/failing mofsets in the original speed control? (no way to test that unless you have equipment and skills). New batteries? Just guessing.
Series carts have no rpm connection to the controller like sepex carts do. It's common for a sepex cart to get a speed increase from just a controller change because the restrictions are removed. Sepex controllers also employ field weakening (throttle map) not done in series controllers. This can get technical and way over my comfort level in a hurry but I'm pretty sure it's well established here that series controllers in and of themselves don't increase speed but they can allow/support other things that do increase speed. I haven't looked at your build thread lately. Did you change weight? Remove a back seat or something? |
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