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Unread 10-09-2013, 05:04 PM   #1
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Default Charger not shutting off?

Not sure I have a problem here..... I plugged the cart in last night, around 10 PM. At 6:30 AM today, the charger was still running and the meter on the cart was reading 66+ volts! The charger needle was reading about 1/3 charge. I unpluged the charger and within a minute or two, the meter read 54.1 volts.
So, did I just catch the charger near the end of the cycle? Or should that sucker have shut off when the cart got to 52/53 volts?

Thoughts?

I guess I just freaked out when I saw 66+ volts on the meter...
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Unread 10-09-2013, 05:04 PM   #2
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Default Re: Charger not shutting off?

FYI, the cart was still above 48.5 volts when I first plugged in the charger...
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Unread 10-09-2013, 05:44 PM   #3
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Default Re: Charger not shutting off?

yes i bet you cought it at the end ...
48.5v = 50% charge
it could take up to 16hrs to fully charge



fully charged is 50.93v after 12hrs rest
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Unread 10-09-2013, 05:59 PM   #4
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Default Re: Charger not shutting off?

48v carts can get above 60v while charging...
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Unread 10-09-2013, 09:19 PM   #5
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Default Re: Charger not shutting off?

Thanks guys. Glad it's not time to panic.... Will keep an eye on it.
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Unread 10-09-2013, 09:31 PM   #6
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Default Re: Charger not shutting off?

when your cart is fully charged the battery pack will get up to 60 - 65 volts is correct.
In fact, the charger may have to take a 48V battery pack up to 67V, or above, to fully charge it.
On the other hand, 59V may fully charge a 48V battery pack.
The voltage it takes to fully charge a 48V battery pack depends on who manufactured the batteries in the pack as well as their age and condition.

By definition, a lead-acid wet cell is fully charged when the specific gravity of the electrolyte ceases to increase while a charging current is passing through it. Since open-circuit voltage increases/decreases as the electrolyte's specific gravity increases/decreases, open-circuit voltage is an indirect or secondary means of monitoring the electrolyte's specific gravity and is often used to do so.

An ideal charger would monitor pack voltage and when it ceased to rise over a predetermined period of time, it would stop the regular charging mode and go into a float charge mode, however few, if any, chargers typically used by golf cart owners are ideal. Most of them simply shut off at a predetermined voltage that is high enough to almost fully charge most battery packs without being so high that repeated use would significantly harm battery packs that are fully charged at the lower end of the typical voltage spectrum needed to fully charge a battery as determined by empirical data.

Here is Trojan's recommended charge curve for a single (2V) deep cycle wet cell. There are 24 cells in a 48V battery pack, so do the math and you get 58.80V to 66.96V. However, Trojan uses an electrolyte that is 27.7% sulfuric acid by weight (SG = 1.277) and other battery manufacturers use different concentrations, so the on-charge voltage that is typically reached when their batteries are fully charged, will be higher or lower.
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