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Unread 09-25-2017, 01:51 AM   #11
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Default Re: Is a 300A controller upgrade worth it?

74beeper, this is likely to only confuse matters in this thread about series systems. It will give some increase in torque, not "earth shaking". Your biggest benefit will be removing the 19mph speed limit from your Yamaha sepex system. And in that case, I would also spend the money on a bigger controller, and limit it as long as stock motor is used. Disclaimer, this response was an answer to a thread jack, and does not apply to the ezgo in this thread, which can use a 500a controller with their stock motor.
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Unread 09-25-2017, 08:45 AM   #12
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Default Re: Is a 300A controller upgrade worth it?

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Originally Posted by jchal3377 View Post
Well the one I'm looking at is not really that nice, but it was a quick, cheap fix option. I appreciate all of the advice on this, an am probably going to hold out for a better option.

If you were going to upgrade a system a little at a time, where would you start? Controller, motor, solenoid, or wires. Clearly the first two are big money moves.

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1. High current cables (all 13 of them). 4Ga or thicker.
2. Controller and solenoid. If both cannot be replaced at same time, solenoid first and then controller asap afterwards. (Stock solenoid is only a 85A unit. needs at least 200A)
3. Heavy duty F/R switch assembly or reversing contactor.
4.Go to 48V next time batteries are replaced.

Stock motor will handle a 500A controller and works better at 48V than it does at 36V, so motor may not need to be upgraded.
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Unread 09-25-2017, 08:50 AM   #13
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Default Re: Is a 300A controller upgrade worth it?

Thanks for the info. Good news on the motor I thought it needed upgrading as well.

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Unread 09-25-2017, 09:17 AM   #14
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Default Re: Is a 300A controller upgrade worth it?

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Originally Posted by jchal3377 View Post
Thanks for the info. Good news on the motor I thought it needed upgrading as well.

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The trick is to figure out what the end goal is and build towards that goal.
If going to 48V is a possibility, get a controller and solenoid that will work on 36V for now and 48V later. Also, if you might go with six 8V batteries to get 48V, get cables for 8V batteries, they will work with 6V batteries, but cables for 6V batteries won't work with 8V batteries (8V batteries have both terminals on same side and need longer interconnecting cables).

In my opinion, the motor is the last thing to upgrade. Get all the other upgrades done and if you need (want) more torque or more speed, upgrade to a motor that gives you what you want. If you are satisfied with the cart's performance, than a motor upgrade isn't needed.
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Unread 09-25-2017, 09:45 AM   #15
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Default Re: Is a 300A controller upgrade worth it?

Exactly the info I was looking for. Thanks a ton. I should probably look at no less than 400a on the controller for good hill claim ing ability correct.

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Unread 09-25-2017, 11:01 AM   #16
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Default Re: Is a 300A controller upgrade worth it?

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Originally Posted by jchal3377 View Post
Exactly the info I was looking for. Thanks a ton. I should probably look at no less than 400a on the controller for good hill claim ing ability correct.

Sent from my H1611 using Tapatalk
There is hill-climbing ability and then there is HILL-CLIMBING ability.

An Alltrax SR48400 is the minimum I'd install. It will deliver 460A for a few moments. (see attached specs)
Since it is a MPT-800 and is capable of being heavily loaded, I'd probably go with a SR48500, but if you aren't going to be hauling heavy loads up steep hills at low speeds, the SR48400 ought to suffice. (EZGO recommended max ramp angle and grade conversion charts attached)

The ability to maintain cruising speed going uphill is more determined by tire height, tire type and battery pack voltage than controller throughput. Those three factors influence the amount of torque that exists where rubber meets road throughout the motor's RPM spectrum while the controller's max amp throughput mostly influences the torque being transferred to the ground at the low end of the RPM spectrum.

Stock tire height is 18" and installing tires taller than that decreases the amount of torque delivered to the road. (Tire height is an integral part of the final drive ratio)

Low pressure tires (max inflation pressure <10PSI) take more torque to turn than higher pressure tires.

Both max RPM and Torque are determined by battery pack voltage. Going from 36V to 48V increases max speed by 33% and increases torque by 33% throughout the RPM spectrum.
Attached Images
File Type: jpg SR Specs.jpg (225.6 KB, 0 views)
File Type: jpg EZGO - Stock Incline.jpg (94.4 KB, 0 views)
File Type: jpg Grade conversion chart.jpg (167.3 KB, 0 views)
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Unread 09-25-2017, 12:05 PM   #17
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Default Re: Is a 300A controller upgrade worth it?

Quote:
Originally Posted by JohnnieB View Post
1. High current cables (all 13 of them). 4Ga or thicker.
2. Controller and solenoid. If both cannot be replaced at same time, solenoid first and then controller asap afterwards. (Stock solenoid is only a 85A unit. needs at least 200A)
3. Heavy duty F/R switch assembly or reversing contactor.
4.Go to 48V next time batteries are replaced.

Stock motor will handle a 500A controller and works better at 48V than it does at 36V, so motor may not need to be upgraded.
I'm looking at doing upgrades one piece at a time as well, and I was under the impression that the F/R switch would need to be replaced before the controller/solenoid. Can the stock F/R switch handle the increased amp draw from a 500a controller, even for a short time?
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Unread 09-25-2017, 12:21 PM   #18
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Default Re: Is a 300A controller upgrade worth it?

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Originally Posted by noxin View Post
I'm looking at doing upgrades one piece at a time as well, and I was under the impression that the F/R switch would need to be replaced before the controller/solenoid. Can the stock F/R switch handle the increased amp draw from a 500a controller, even for a short time?
It depends. If the F/R switch assembly is in good electrical and mechanical condition, it might hang in there for a little while, however a stock F/R is marginal for a stock controller, so it won't last very long.

Or at least that is the way I understand it. I've got a sepex drive system, so I'm not all that familiar with the F/R switch in a series drive.
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Unread 09-25-2017, 12:29 PM   #19
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Default Re: Is a 300A controller upgrade worth it?

Lot's of good info JohnnieB for us non-flatlanders. Thanks!!!
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Unread 09-25-2017, 07:59 PM   #20
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Default Re: Is a 300A controller upgrade worth it?

Quote:
Originally Posted by noxin View Post
I'm looking at doing upgrades one piece at a time as well, and I was under the impression that the F/R switch would need to be replaced before the controller/solenoid. Can the stock F/R switch handle the increased amp draw from a 500a controller, even for a short time?


Just as long as it doesn't turn out like Johnny Cash's, Psycho Billy Cadillac..... Cuz he got it..... "One piece at a time, and it didn't cost me a dime"


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