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Old 10-24-2015, 02:14 PM   #1
jim,s
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Default batteries

In april 2015 I put a new set of trojan 105 batteries in my 1995 ezgo 36 volt series cart. At the same time I put all new 4 guage cables on the entire cart along with a HD F/R switch. When I purchased the batteries I took the charger with me and had it tested, I was told it needed a new pc board. All was repaired and tested. Now my pack voltage comes up to 38.2/4 after charging. My problem is that when I drive for a mile or so my battery pack goes down to 35.5/6 then after it sets for a few minutes it will go up to 37.2 then if Igo a mile again after a few minutes the pack goes to 36 .8 and the cart feels like it lost a lot of power. So now I pop the caps and check with a hydrometer all batteries are pretty much even. on the hydrometer says the cells are in the fair condition. I have always done things by the book, as far as charging goes. I think the trojan batteries dont live up to their name.
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Old 10-24-2015, 03:09 PM   #2
crash test dummy
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Default Re: batteries

this sounds normal to me
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Old 10-24-2015, 05:02 PM   #3
JohnnieB
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Default Re: batteries

It depends on how long the batteries were allowed to rest (neither charging or discharging) before the voltage measurements were taken.

The pack voltage of a 36V set of batteries will be about 45V when the charger shuts off automatically and after the have rested about 12 hours, they should measure about 38.2V if they were fully charged, or close to it.

Due to their internal resistance, the batteries in a 225AH, 36V pack, in and of themselves, will drop about 1.0V per 100A of current being drawn from them. The voltage drop is almost instantaneous, but the recover is slow. In fact, it takes about an hour for the batteries to return to their "At-Rest" voltage after current ceases to be drawn from them. However, the recovery is at an exponential rate, so most of it occurs in the first few minutes. For casual SoC checks to estimate when it is time to head for the charger, 5-10 minutes rest time will typically suffice. For serious battery health and range estimations, I let mine rest for half an hour.

If your cart starts getting noticeably less energetic after only 3 or 4 miles, I'd take a close look at the individual battery At-Rest voltages as well as the pack's At-Rest voltage before and after a five mile ride starting with a full charge.

What amp controller and what tire height and what tire pressure are you running?
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Old 10-25-2015, 05:43 AM   #4
jim,s
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Default Re: batteries

johnnie B, I will have to get that info on monday. kinda busy today with my son going back to his base in S.C. We had him home for a week. (U S NAVY)
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