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Electric Club Car Electric DS, and Precedent golf cars



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Unread 06-14-2019, 06:59 PM   #1
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Default What did I do wrong now???????

Ok battery gurus give me your opinion. I had the dreaded 4 - 12 volt batteries in my 2004 Precedent. They were 2017 T-1275ís and one of them was already on itís way out. I figured screw it iím going to change things up a bit so I went and dropped pretty good money on a set of 8 T-145ís. I modified the battery tub to fit 6 under the seat and two in the bag well. My goal was the most run time I could get without going Li-Ion. Yes I know I should have just done that. Got all the batteries wired and everything was good to go. Wired with 4 gauge wires and I have a plum quick motor. The controller is stock except it has the #4 speed setting and the solenoid is stock. With the 4 - 12ís it would run 26 mph pretty consistently on flat ground with decent acceleration. Know it has slower acceleration and struggles to run 22 mph. I canít even hit 26 mph going down a hill now. No I was not expecting this to be a rocket ship now because I know it is still a 48 volt system but I didnít really expect those results. I was hoping to maintain what I had and gain some range. I donít use the OBC any longer because I have a ďsmartĒ charger. I know I am carrying some extra battery weight but would that really slow me down that much? Any one have any thoughts?
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Unread 06-14-2019, 07:01 PM   #2
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Default Re: What did I do wrong now???????

Check voltage at controller while driving. Perhaps a battery is hooked up wrong...
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Unread 06-14-2019, 07:05 PM   #3
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Default Re: What did I do wrong now???????

I have 50 + volts at the main + and - of the battery pack. That’s the first thing I checked.
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Unread 06-14-2019, 07:09 PM   #4
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Default Re: What did I do wrong now???????

I guess I didn’t check it while I was driving though.
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Unread 06-14-2019, 07:32 PM   #5
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Default Re: What did I do wrong now???????

I've heard people say that it takes quite a few charge cycles to get the batteries broken in. If I remember correctly it might take up to a month before they reach full capacity.
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Unread 06-14-2019, 07:50 PM   #6
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Default Re: What did I do wrong now???????

I have heard that as well. I have heard anywhere from 15 to 25 cycles before they reach 100 percent. I also know you are not supposed to run them below 50 %. I guess there is a chance they will get better with age.
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Unread 06-14-2019, 08:23 PM   #7
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Default Re: What did I do wrong now???????

..deleted..

Sorry, when I checked my facts, the comment I made was wrong.
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Unread 06-14-2019, 09:59 PM   #8
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Default Re: What did I do wrong now???????

That % we speak of is more for duration as the plates season. The batteries will get stronger in regards to capacity (Ah range), but in regards to speed, it will not change much as that is relative to voltage and as long as you are fully charged, you have that. One big point here will be the added weight... You have a substantial increase with 8x6 as compared to 4x12....
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Unread 06-15-2019, 09:41 AM   #9
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Default Re: What did I do wrong now???????

After doing a little math it looks like the cart gained about 236 lbs so that doesn’t help.
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Unread 06-15-2019, 10:10 AM   #10
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Default Re: What did I do wrong now???????

I wouldn't think and extra 240lbs would make it unable to still reach the same top speed as before. Are you sure you don't have a bad battery cable? Do any of them get hot after running for a while?
Voltage testing the pack under load would tell you if there is a major drop. Capacity and voltage kinda go together. If the capacity is low the voltage will drop more when under a load. It's possible that as the batteries get a few cycles and their capacity increases the voltage under load will also increase.

What controller do you have? Any chance some settings there got reset while the batteries ere out?

What charger do you have? The 6V batteries have about twice the AH capacity as the 12v pack did, and to charge them properly you may need a charger with a higher current output, like a 1050W Lester Summit II.
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