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Unread 10-28-2013, 04:40 AM   #11
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Default Re: Speed Expectations For 48 Volt CC

Most chargers are auto shut off. Your batts may be suffering if your charger isn't fully charging the pack.
How steep of hills are you climbing? 45 degree incline will slowi most carts to 4-5 mph. Sounds like batts and you need a motor upgrade? Check with ScottyB or Plum Quick.
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Unread 10-30-2013, 10:16 AM   #12
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Default Re: Speed Expectations For 48 Volt CC

Okay, someone please give me an electronics 201 lesson, as it pertains to 2 questions that I have on how my 48-volt cart system operates and the maintenance thereof. I have read several articles/posts about this, including what ScottyB has to say (which may have been the most helpful), but there are 2 questions (and probably many more) that remain unresolved.
I get that volts=speed and that the battery is the source, the cabling is the pipeline, and that there must be an unrestricted flow from the source to the motor. I get that amps=torque, which I interpret as the ability to maintain power or speed against an increased resistance, and that the controller acts as a regulator of how much torque is delivered to the motor. I get that if any component of the system is depleted that it will impact the entire system. I am a novice when it comes to maintenance of an electrical system, and I acknowledge that I have an older, weaker set of batteries, but here is what I don't get so far:
1) Even as an older, weaker set of batteries, they come to a smidge over 50 volts at full charge. Why then, would they not deliver the same power (speed), at least as short-term, as a new, stronger set of batteries?
2) Why is there such a variance of answers about speed expectations for a basic setup? Some members of the forum will say that a stock DS motor will provide 15-20mph, while others will report that the hp of the stock DS motor is not capable of that speed. Is there a reason, other than opinion, for this inconsistency?

I am working on my 1st cart rebuild and don't know a lot about what to expect from it. When I climb aboard and run the cart, I am pleased with what it does, until I read from the posts about what others have experienced. So, if someone can share experience apart from opinion, based in a greater understanding of the mechanics, please help me understand. THANKS!
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Unread 10-30-2013, 10:48 AM   #13
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Default Re: Speed Expectations For 48 Volt CC

Part of the problem in setting speed expectations is the myriad of models, motors and drive systems which were "stock" offerings from CC. Some were better than others in outright speed. Assuming straight stock configuration, an old resistor type 36V cart might make 12 mph at best - and a modern precedent with speed code 4 programmed into it, approx 20mph. Every other model, somewhere in between those numbers.

Add to that, the changes (including yours) that people make and eventually the variables make predicting speed pretty difficult. Your basic concepts of the electronics are absolutely correct as you have stated them.

The reason for the focus on batteries is that under heavy driving load (even immediately after a charge) a bad battery can collapse (and even reverse) its voltage contribution to the pack. When I test my batteries, I hook alligator clips to my voltmeter, set it on the seat, and monitor the voltage of each battery separately while climbing a steep hill. If you have a bad one (or two) you'll see it. If they all hold reasonable voltage during this test then you should look elsewhere in your system for gaining speed.
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Unread 10-30-2013, 11:14 AM   #14
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Default Re: Speed Expectations For 48 Volt CC

awesome suggestion, I had thought of doing that for the group but not for each battery. it sounds like that would be great for diagnosing individual battery needs in real time, thanks!
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Unread 10-31-2013, 03:14 PM   #15
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Default Re: Speed Expectations For 48 Volt CC

Jay and Joe (& anyone else),
Its hard for me to believe that this thread has generated over 400 views in about a week...
I took the cart out last night after a full charge for a battery "stress-test". I metered each battery before and after climbing a +-30degree 100yd hill, each one remained constant and above 8 volts before and during the test, the buggy averaging a 6mph rate on each lap. I then ran it at full throttle (8-10mph on flats, 5-7mph on hill climbs) through the neighborhood for about 20 minutes, after which the multimeter test showed that it remained at the 50 volt level. So, given the advice that you offered, the batteries seem to have passed the stress test.
I suppose that the next step is to consider replacing the original stock motor, but are there diagnosis steps that could be taken before that which might uncover a less costly solution?
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Unread 10-31-2013, 03:55 PM   #16
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Default Re: Speed Expectations For 48 Volt CC

Just out of morbid curiosity, is it faster in reverse ?
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Unread 10-31-2013, 04:10 PM   #17
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Default Re: Speed Expectations For 48 Volt CC

also have you checked the program on your controller? it could be that it just needs to be set up correctly
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Unread 10-31-2013, 04:21 PM   #18
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Default Re: Speed Expectations For 48 Volt CC

I am assuming an Alltrax Series controller but check pin 4 and see if there is voltage there when it is in Forward. The Alltrax documentation doesn't have it connected but.... 4 is the small blade connection farthest from the led.
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Unread 10-31-2013, 05:24 PM   #19
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Default Re: Speed Expectations For 48 Volt CC

(1) Even as an older, weaker set of batteries, they come to a smidge over 50 volts at full charge. Why then, would they not deliver the same power (speed), at least as short-term, as a new, stronger set of batteries?



First voltage is inversely proportional to current. Voltage goes up current goes down and vice versa. Your six batteries are in series so current is the same through all the batteries. So say you have one battery that can't generate enough current and you put them on the charger, The bad battery will limit the current though the entire series circuit The current will drop faster so the voltage will rise faster up to the cutoff point. What has happened is that the one bad battery limited the current in the string and prevented a full charge. One sure sign of a bad battery is that if it normally took 3 or 4 hours to charge and your charger shuts in a much shorter time.
So it is when the current drops down and the voltage rises that shuts off the charger
PS I don't have any recommendations for an expensive fishing trip. Or in your case hunting trip.
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Unread 10-31-2013, 06:37 PM   #20
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Default Re: Speed Expectations For 48 Volt CC

So KG,
No Dr. Phil here, but take me a little deeper into your thought process about pin 4 on the alltrax...
Branson,
To my best recollection, the alltrax that I bought is non-programmable, for my purposes anyway. I asked about the small adjustment post on another thread and the general consensus is that it is set where it needs to stay.
Hmmm... Lets assume that it is not, for now. Is there a multi-meter test that I can perform on the leads from the controller to the motor that would provide information to that conclusion, and if so, how and what to look for? Interesting thought... Did it come preset incorrectly? Hmmm...

Some day, I will buy you guys a cup of coffee for the tips... Not everybody, just those that are sharing from experience... My nearest CC dealer/shop is 2 hours away...
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