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Old 03-13-2013, 08:37 AM   #1
Oneunder
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Default What Watt is my motor?

I have a 2005 ezgo. TXTEFSEPDS, J2105. Can anyone tell me what is the maximum amount of volts/electricity this stock unit can accept before frying the controller (if that is the limiting factor)? I have also been asked what is the watt of my motor but have been unable to find that information. Any help on this is much appreciated.
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Old 03-13-2013, 10:01 AM   #2
JohnnieB
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Default Re: What Watt is my motor?

To put things into perspective, the motor will draw all the amps made available to it.
The controller limits the number of amps the motor can draw.
The stock PDS controller (and solenoid) are designed to at 36V and will pass 300A.
The stock PDS motor will operate over a wide range of voltages. (36-42-48-72 etc.)

The number of watts applied to the motor is determined by the voltage of the battery pack and how many amps the controller will pass.

A stock PDS cart, (36V battery pack with a 300A controller) can apply about 11.46kW to the stock motor.
My set-up (42V battery pack and a 400A controller) can apply about 17.82kW to a stock motor.
A 48V battery pack with a 400A controller can apply about 20.37kW.
A 48V battery pack with a 500A controller can apply about 25.47kW, but that is pushing a stock PDS motor's performance envelope pretty hard.

Apparently, you are thinking about modifying your cart. What is your end goal?

No matter what it is, there is likely to be somebody here that has done it and can offer some advise
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Old 03-13-2013, 10:28 AM   #3
Oneunder
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Default Re: What Watt is my motor?

[QUOTE=JohnnieB;

Apparently, you are thinking about modifying your cart. What is your end goal?

No matter what it is, there is likely to be somebody here that has done it and can offer some advise [/QUOTE]

I am hoping to increase the speed and distance of my 36v cart. I am curious what the "bottle neck" of the stock system is. It sounds like the controller is. At what voltage do you risk frying the controller?
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Old 03-13-2013, 11:39 AM   #4
scottyb
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Default Re: What Watt is my motor?

Quote:
Originally Posted by Oneunder View Post
I am hoping to increase the speed and distance of my 36v cart. I am curious what the "bottle neck" of the stock system is. It sounds like the controller is. At what voltage do you risk frying the controller?
Do you mean at what operating voltage do you risk frying the controller?
Anything above 36v will fry the stock controller. The 'bottleneck' will move if you replace one component and not another. You need to upgrade the delivery system as a whole to handle more voltage/amperage, not just one component.
Most aftermarket controller will be capable of handling 36 - 48 volts, some may be 72v compatible ... they will be rated as such.
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Old 03-13-2013, 12:02 PM   #5
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Default Re: What Watt is my motor?

In general terms:
Speed = Voltage
Distance = Amp-Hour capacity of battery pack.

In the Freedom Mode, a stock PDS cart will do about 19MPH on stock height (18") tires.
You can gain speed by increasing tire height, but you lose torque and it takes more amps to turn taller tires, so cable, controller and motor heat become issues.

Without lifting the cart, 20" tires is the max tire height, which is also the max height for a stock controller.
That will give you about 21MPH, with about a 10% reduction in torque.
To go faster than that, you have to replace the controller with an aftermarket one that doesn't limit motor RPM like the PDS controller does.


As for bottlenecks, a stock PDS cart has three major ones.
1. High current cables. A 2005 might has some 6Ga cables. They should all be (there are 10 of them) 4ga or heavier. (4Ga is adequate for 500A or smaller controllers)
Also, the OEM cables are an open ended design and corrosion gets into the cable strands, so they aren't serviceable for more than a few years, and your 2005 cables probably need to be replaced even if they are 4Ga.

2. Controller. Only 300A, voltage limited to 36V and limits motor to 4,400 RPM.
Aftermarket controllers pass more amps, work with higher voltages and don't limit motor RPM.

3. Solenoid. Stock solenoid is marginal for stock (300A) controller and only operates at 36V.
The solenoid should be compatible with the controller.

---------
Distance (Run-Time) is limited by the kWh (Kilo-Watt-Hours) of energy stored in your battery pack.
For comparisons, multiply the pack voltage by the AH ratings of the batteries to get Watts.

No matter what voltage the battery pack is, the higher the Amp-Hour rating of the batteries in the pack, the greater the Run-Time.

Distance was my goal and I wanted to keep everything under the seat, so I went with seven 245AH batteries.
For me, torque gain was distant second and speed gain was an even more distant third, but I'll be picking up plenty of both.
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Old 03-14-2013, 05:33 AM   #6
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Default Re: What Watt is my motor?

You can find an online calculator for Ohms Law and the Power Formula. This will give you a good place to start. The motor plate gives a bit of info, for instance, you can run a 36v motor on 48v. A helpful way to think about Volts, Amps etc is to compair it with flowing water, voltage is the pressure and amps are the size of the pipe or the flow.
I hope this helps you....
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Old 03-15-2013, 08:52 AM   #7
Oneunder
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Default Re: What Watt is my motor?

After picking up my meter from Scottyb, I have some questions.

I noticed that 36 volt batteries actually are pushing over 38 volts. Even though mine can't get above 37.2v. So the controller and solenoid have some range over 36 volts before they fry. What is the top of that range?

Secondly, do stock ez-gos have a built in safety to shut off the power below a certain volt to prevent battery damage? I noticed when my batteries got very low, the cart shut off. But after recovering for a bit, it would engage. If this is so, what is that bottom voltage?

Finally, if said safety does exist, does it disengage when the voltage temporally drops during a steep hill climb?
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Old 03-15-2013, 10:27 AM   #8
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Default Re: What Watt is my motor?

Quote:
Originally Posted by Oneunder View Post
.................
I1. noticed that 36 volt batteries actually are pushing over 38 volts. Even though mine can't get above 37.2v. So the controller and solenoid have some range over 36 volts before they fry. What is the top of that range?

2. Secondly, do stock ez-gos have a built in safety to shut off the power below a certain volt to prevent battery damage? I noticed when my batteries got very low, the cart shut off. But after recovering for a bit, it would engage. If this is so, what is that bottom voltage?

3. Finally, if said safety does exist, does it disengage when the voltage temporally drops during a steep hill climb?
1. A fully charged 36V battery pack will read 38.2V after they have rested about 12 hours after being charged.
The On-charge voltage will reach about 45V before charger turns off automatically.
The 36V solenoid and controller can handle the on-charge voltage briefly, but the fully charged voltage for 48V packs is 50.93V.
Also the High voltage cutoff on a 36V PDS controller is 48V.

They might work with a 42V pack (44.56V = Full charge), but they might have melt-down.
Also, the on-charge voltage for a 42V pack reaches 52.5V and the pack could easily exceed the 48V high voltage cutoff if regen braking was used.

2. The low voltage cut-off is to protect the controller, not the batteries.
Battery voltage drops under load and shouldn't be taken below 1.5V per cell, which is 27V for a 36V battery pack.
I'm not sure what the low voltage cutoff is for a 36V PDS controller, but I think it is in the mid0teens and that is far lower the the voltage were irreversible battery damage occurs.

3. Yes. You will have to stop cart and lift foot off throttle to get cart moving again.
However, if the controller is shutting off while climbing a hill, you have some serious issues with the cart, the batteries and/or battery charging practices.
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