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Old 07-03-2013, 09:27 PM   #1
mailbrown
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Default Proper time to charge (voltage)

I just installed an LCD volt meter on my 48V EZGO. It currently reads 48.5. At what voltage should I charge the cart? And at what voltage will it not operate?

Thanks!
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Old 07-03-2013, 10:28 PM   #2
jakesnake27
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Default Re: Proper time to charge (voltage)

Recharge at 50% or 48.4 volts.
Letting them get below this frequently is hard on them.
Anything under 46v and the cart probably won't move...
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Old 07-03-2013, 10:31 PM   #3
cgtech
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Default Re: Proper time to charge (voltage)

this pic chart will tell you. all these numbers are "at-rest" not while "under load". most of this data is from Trojan website. As for when it will stop moving? that varies by cart, but in all cases, by that time you are damaging the batteries by over-discharging them.
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Old 07-03-2013, 10:53 PM   #4
mailbrown
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Default Re: Proper time to charge (voltage)

Good info, thanks guys!
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Old 07-04-2013, 07:23 AM   #5
JohnnieB
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Default Re: Proper time to charge (voltage)

Quote:
Originally Posted by mailbrown View Post
I just installed an LCD volt meter on my 48V EZGO. It currently reads 48.5. At what voltage should I charge the cart? And at what voltage will it not operate?

Thanks!
Lead-Acid batteries have no memory, so there is no specific voltage at which they should be recharged at, however there are voltages that you should never allow the battery pack to drop below and you should never allow them to sit in a partially discharged state.

Basically, recharge the batteries after each use. Of course, it depends on how the cart is used, but if the cart is used during the day, the batteries should be on-charge that night. And in cases of heavy usage, opportunity charging is a good idea.

For battery longevity (lifespan) you want to maintain the highest average SoC (State of Charge) as possible and practical.

Attached are charts for At-Rest voltage vs SoC and Average SoC vs Theoretical Life Expectancy.

At-Rest voltage is taken about 12 hours after the charger shuts off, or about 30 minutes after the batteries have been used. Voltages taken sooner will not reflect the true SoC.

---------
You have a DVM type battery meter, so you are monitoring the pack voltage in real-time and have probably noticed it appears to bounce all over the place while driving the cart. What is happening is that the pack voltage decreases as the load (Amps being drawn) increases.

An Under-Load voltage to be aware of is 1.75VPC (Volts per Cell), which equates to 42.0V for a 48V battery pack. Avoid dropping the voltage below that while climbing hills and in other heavy load situations.

Irreversible physical damage doesn't start occurring until about 1.5VPC (36.0V for a 48V pack), but battery manufacturers don't usually go below 1.75VPC when doing non-destructive testing.
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File Type: jpg SoC vs Theoretical Charge cycles with Voltages-2.JPG (114.0 KB, 0 views)
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