48V Battery Charge Question

chrisp83 · 05-13-2012, 05:58 PM

Hello everyone!

First of all, I want to thank each of you for the wealth of knowledge that you share on here.

I just purchased a 2009 EZ-GO RXV and completely customized it including lift kit, tires/wheels, upholstery, LED lights, etc.

It is a 48 Volt system with Trojan T-1275 Batteries (2009). I have noticed that under full load, the state of charge meter pulls down and , but understand that this is normal as the needle moves back to the fully charged state.

Question I have is what should the voltage read fully charged? I am using the PowerWise QE Charger. While charging, down to last 10 - 20% of charge volt meter reads 49 to 50 volts. Once charging has stopped and sit for a bit, they read around 42 volts. Is this normal?

I have seen no issues that leads me to believe that they are bad, just curious if this is normal.

Thanks in advance for your replies.

Chris

chrisp83 · 05-13-2012, 06:05 PM

In case anyone wants to see pictures of the cart, here they are!

kernal · 05-13-2012, 06:10 PM

Is this what you are looking for?

kab69440 · 05-13-2012, 06:19 PM

A 48v fully charged and rested pack should be on the order of 51v. A 42v reading is a real problem.

chrisp83 · 05-13-2012, 06:20 PM

That is much help, thank you!

So I feel like an idiot. I was only checking voltage from the 3rd battery in the series. I just checked it from the fourth and last battery, and I have a voltage reading of 52. So according to the chart, I have 100%.

Is this a fair assumption?

I am sorry to ask a question and realize it was user error!

Chris

kab69440 · 05-13-2012, 06:23 PM

That sounds better. Glad to hear it was only a brain fart!

chrisp83 · 05-13-2012, 06:27 PM

I agree! Thank you again for your help.

kernal · 05-13-2012, 06:28 PM

Pretty cart! BTW

chrisp83 · 05-13-2012, 06:36 PM

Thank you Kernal!

This is our third cart. Spent a little more money on this one than I should have, but we only live once.

JohnnieB · 05-14-2012, 11:36 AM

Quote:

Originally Posted by chrisp83

.................and I have a voltage reading of 52. So according to the chart, I have 100%.

Is this a fair assumption?

No, it isn't. 52V is over a volt over 100%, so you probably reading a surface charge.

To get an accurate SoC reading from the chart, let batteries "Rest" for 12 hours after charger automatically cuts off.

Your pack voltage when the charger cuts off is in the 58V - 61V range, but that is a surface charge and doesn't accurately reflect State of Charge.
Give them about half a day to deplete through self-discharge, or drive about a mile.

05-13-2012, 05:58 PM	#1
chrisp83 Not Yet Wild Join Date: May 2012 Location: Ellijay, GA / Myrtle Beach, SC Posts: 9	48V Battery Charge Question Hello everyone! First of all, I want to thank each of you for the wealth of knowledge that you share on here. I just purchased a 2009 EZ-GO RXV and completely customized it including lift kit, tires/wheels, upholstery, LED lights, etc. It is a 48 Volt system with Trojan T-1275 Batteries (2009). I have noticed that under full load, the state of charge meter pulls down and , but understand that this is normal as the needle moves back to the fully charged state. Question I have is what should the voltage read fully charged? I am using the PowerWise QE Charger. While charging, down to last 10 - 20% of charge volt meter reads 49 to 50 volts. Once charging has stopped and sit for a bit, they read around 42 volts. Is this normal? I have seen no issues that leads me to believe that they are bad, just curious if this is normal. Thanks in advance for your replies. Chris

05-13-2012, 06:19 PM	#4
kab69440 Gone Wild Join Date: Aug 2010 Location: Marion, Ohio Posts: 1,391	Re: 48V Battery Charge Question A 48v fully charged and rested pack should be on the order of 51v. A 42v reading is a real problem.

05-13-2012, 06:20 PM	#5
chrisp83 Not Yet Wild Join Date: May 2012 Location: Ellijay, GA / Myrtle Beach, SC Posts: 9	Re: 48V Battery Charge Question That is much help, thank you! So I feel like an idiot. I was only checking voltage from the 3rd battery in the series. I just checked it from the fourth and last battery, and I have a voltage reading of 52. So according to the chart, I have 100%. Is this a fair assumption? I am sorry to ask a question and realize it was user error! Chris

05-13-2012, 06:23 PM	#6
kab69440 Gone Wild Join Date: Aug 2010 Location: Marion, Ohio Posts: 1,391	Re: 48V Battery Charge Question That sounds better. Glad to hear it was only a brain fart!

05-13-2012, 06:27 PM	#7
chrisp83 Not Yet Wild Join Date: May 2012 Location: Ellijay, GA / Myrtle Beach, SC Posts: 9	Re: 48V Battery Charge Question I agree! Thank you again for your help.

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05-13-2012, 06:28 PM	#8
kernal Gone Wild Join Date: Jul 2010 Location: Peachtree City, Ga. Posts: 2,759	Re: 48V Battery Charge Question Pretty cart! BTW

05-13-2012, 06:36 PM	#9
chrisp83 Not Yet Wild Join Date: May 2012 Location: Ellijay, GA / Myrtle Beach, SC Posts: 9	Re: 48V Battery Charge Question Thank you Kernal! This is our third cart. Spent a little more money on this one than I should have, but we only live once.

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