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Old 02-03-2009, 10:22 PM   #1
oxfordlawn
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Default What Volt specs. from a 48V setup

Could you guys tell me what voltage readings I should be getting from a set of six new 8V batteries. At full charge what should the pack read, what should each individual battery read, and also what voltages should I see from pack while running....would this change being full throttle up hill and also on flats. Im asking because I want to be sure Im getting full charge and don't have a bad battery in the pack...They are Wal-mart Golf Cart batteries made by Johnson Controls. I also have a 48V Schauer charger and I want to know it is charging fully also.

Thanks everyone
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Old 02-03-2009, 10:37 PM   #2
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Default Re: What Volt specs. from a 48V setup

THese stats are taken from the Trojan website... 100% charged is 50.93 volts. Divide by 6 = ? individual reading... New batteries will not reach their highest potential until 10 to 20 charge/ 50% drain cycles. 50% drain reading is 48.41. NEVER draw the pack down below 48v..... Good luck.
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Old 02-03-2009, 11:03 PM   #3
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Default Re: What Volt specs. from a 48V setup

Scotty, your always there with the answers..Thanks
I went\ to Trojan and grabbed all the specs..took a second to find them
My next question, probably sound silly to you but...
I understand those voltages they listed...said open circuit which I assume means while standing still, no throttle. Should I be watching any voltage readings while on the throttle to test the battery pack?
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Old 02-03-2009, 11:22 PM   #4
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Default Re: What Volt specs. from a 48V setup

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Old 02-04-2009, 09:51 AM   #5
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Default Re: What Volt specs. from a 48V setup

Quote:
Originally Posted by oxfordlawn View Post
I went\ to Trojan and grabbed all the specs..took a second to find them
My next question, probably sound silly to you but...
I understand those voltages they listed...said open circuit which I assume means while standing still, no throttle. Should I be watching any voltage readings while on the throttle to test the battery pack?
Yes those are static readings, and should be taken open circuit 2 or more hours after a charge or discharge cycle.

The SOC are only relative and do not indicate capacity.

To take SOC measurements under a load like driving, you need to have a hydrometer to sample/monitor the specific gravity. When you see the SPG = 1.90, measure the voltage uder load and that will be the true 50% SOC for your battery.

100% = 1.255 - 1.275
75% = 1.215 - 1.235
50% = 1.180 - 1.200
25% = 1.155 - 1.165
0% = 1.110 - 1.130

Under load your 50% SOC reading should be around 46.32 volts at 25 degree C
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Old 02-05-2009, 09:31 AM   #6
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Default Re: What Volt specs. from a 48V setup

OK so I have the meters, I have the understanding and ability...now I need some specs. Taking off from a dead stop or climbing a hill, what would be the minimum voltages I would want to see from good batteries. When it warms up tomorrow, I want to do a battery voltage "balance" test for all batteries and check each batteries minimum voltage under load like, that up hill from a stop idea...that would point to a bad battery or cell also wont it?
If I still had my load tester this would be easy, but I don't so i was thinking of straining cart and measuring each batteries min/max readings under the same stress(hill).
I will also do a voltage drop test across main cables running all the way back to the motor. I was just thinking about a bad contact somewhere in the VGlide controls f/r switch or maybe my soldered joints. WHat would be considered a bad voltage drop reading across my test from batt+ to motor stud...any thoughts?
thats enough typing for now
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Old 02-05-2009, 10:01 AM   #7
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Default Re: What Volt specs. from a 48V setup

As I tried to explain State of Charge voltages are only valid when the batteries have been at rest for several hours. The only way to use voltages under load is to use a hydrometer, and record the voltages.

I just checked Trojan specs again and it looks like they changed them slightly.

100% 1.277
90% 1.258
80% 1.238
70% 1.217
60% 1.195
50% 1.172

So get you a hydrometer, fully charge the batteries until you get a SP of 1.277, take off and record voltage, drive in 10 minutes intervals, stop and check the hydrometer readings and record the voltages at the measurements above. When you take the voltage the cart should be running. If you are looking for a magic number it is 50%. You never want to discharge more than that, and that voltage should be around 46.4 volts. What you actually get will be slightly different. Hydrometer is the only acurate measurement of the batteries health and state of charge.

Good Luck

Edit: take the voltage right at the battery terminals, or else you will have a voltage drop error.
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Old 02-05-2009, 10:10 AM   #8
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Default Re: What Volt specs. from a 48V setup

I don't know the answer to all that .... but, you can get a hydrometer at any AutoParts store for like 7-15 dollars that will test the specific gravity of each cell .... and that will tell the exact condition of each battery cell.
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Old 02-05-2009, 11:11 AM   #9
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Default Re: What Volt specs. from a 48V setup

I might just go buy one of those..have read several posts while searching these forums and posts referring to hydro readings also...its cold and I have nothing better to do...
Also I plugged my charger back in this morning and turned it on..it started charging at 59.9 volts...then it went to its other charge mode within an hour and now putting out 53.* volts, and its been there for a few hours.....normal??
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Old 02-05-2009, 11:49 AM   #10
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Default Re: What Volt specs. from a 48V setup

Quote:
Originally Posted by oxfordlawn View Post
Also I plugged my charger back in this morning and turned it on..it started charging at 59.9 volts...then it went to its other charge mode within an hour and now putting out 53.* volts, and its been there for a few hours.....normal??
Yes it is. Let it sit for 6 hours without a charger or any load and you should read about 51 volts. To get your first voltage, after it rest for 6 hours and you read the 51 volts, take it for a spin and read the voltage while running and that is your 100% SOC. Should be around 49 volts or so.

One note here though, temp affects SP and volatge. The numbers I gave you are for 25 C or 77 F. Best to wait for a warm day, or if you are good at math you can adjust for temp compensation is colder. I can help you if you want to do that. Its not that hard, just takes time. But if you are good with Excel you can do it quick and make a chart for every dergree off of 77.

Just be sure you buy a quality Hydrometer, accuracy counts. Get the kind that looks like a turkey baister with a float. Avoid the ones with colored balls.

Temperature Correction:

SG of acid is temperature dependent. If the temperature is very cold or very hot this can lead to incorrect readings. To correct for temperature use the following equations the equations or below 70ºF subtract points (0.03 per 10ºF) and above 70ºF add points.

Correction factor = (0.331 x T/ºF - 23) / 100 or 0.03 pts per 10 ºF
Correction factor = (0.595 x T/ºC - 12.5) / 100 or 0.03 pts per 5 ºC

This is valid for 0-130ºF or -17.8- 54.4ºC
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