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Unread 02-07-2010, 02:10 PM   #31
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Default Re: Batteries 6-8v or 8-6v

Well hate to be the bearer of bad news, but using SOC voltages is pretty much useless because they are only valid when the battery temperature is at 77 degrees Fahrenheit and have been rested for several hours without any any charge or discharge currents. Only true real time measurement can be done is with a temperature corrected hydrometer reading.
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Unread 02-07-2010, 02:24 PM   #32
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Default Re: Batteries 6-8v or 8-6v

Quote:
Originally Posted by sunking View Post
Well hate to be the bearer of bad news, but using SOC voltages is pretty much useless because they are only valid when the battery temperature is at 77 degrees Fahrenheit and have been rested for several hours without any any charge or discharge currents. Only true real time measurement can be done is with a temperature corrected hydrometer reading.
Oh Come on....... Don't BS us Bearing Bad News is what Engineers do best
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Unread 02-07-2010, 02:26 PM   #33
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Default Re: Batteries 6-8v or 8-6v

Any way to know if I can go further with just a volt meter?

On my last trip I had pedal to metal up small to medium inclines and was seeing voltage readings of 46.

I seem to remember someone telling me that a discharge test would stop at 42.5 volts.

Any of these numbers help me to know I can go further?
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Unread 02-07-2010, 02:32 PM   #34
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Default Re: Batteries 6-8v or 8-6v

What does the pack read at rest ( let it sit a few minutes before reading)
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Unread 02-07-2010, 02:41 PM   #35
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Default Re: Batteries 6-8v or 8-6v

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Originally Posted by scottyb View Post
What does the pack read at rest ( let it sit a few minutes before reading)
The old girl has gone 40 miles and after 45 minutes of rest reads 49.1

An insight what value the under load numbers are? I have my volt meter attached to the pack via clips. Under tough load, they were 45.5 - 46
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Unread 02-07-2010, 02:50 PM   #36
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Default Re: Batteries 6-8v or 8-6v

THose read like excellent test results to me. I am not an engineer , just a tech but, I say you have healthy batteries just from the voltage readings you gave. I see that after 40 miles of hilly terrain your batts are sitting at about 65% of full and at the biggest hills drew down as low as I would want to see them? Maybe somebody else can comment on the under load readings?
Thanks for the info.
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Unread 02-07-2010, 02:57 PM   #37
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Default Re: Batteries 6-8v or 8-6v

I was pretty sure the pack was good, this test is not for the pack, it is to compare 8 6v versus 6 8 volters on the same cart.

I think I can continue with the 8 6v test with SOC at 49.1.....

Will take a small loop and check back if any insights came in....
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Unread 02-08-2010, 07:03 AM   #38
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Default Re: Batteries 6-8v or 8-6v

I have completed the test with the 8-6 v batteries. I hope to do the same test with the same cart using 6-8 volt batteries this week.

I have many questions, but here are some I remember:
  1. How much effect is temperature? Most of my tests were under 50 degrees F.
  2. How can I interpret the under load voltages (I have a volt meter hooked up to the pack). Toward the end I was seeing 45-46v on flats at 22MPH, down to 43 to climb steep hill. Should I be keeping this data in detail during test?
  3. Based on the data I have provided can we tell how much further the cart will travel at full speed (> 20 MPH)>
Here are the results as I remembered to write them down.
Attached Images
File Type: jpg batterytest8-6v.jpg (105.2 KB, 25 views)
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Unread 02-08-2010, 10:05 AM   #39
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Default Re: Batteries 6-8v or 8-6v

I just got off the phone with Crown batteries and he said 8-6v's is the way to go. He said you may get a little more speed with the 6-8v's but you get a lot more range with 8-6v's.
My dilemma now is drive 1hr each way for Crown CR-225 for $89 or drive 5min for T-105+ for $89??
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Unread 02-08-2010, 10:08 AM   #40
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Default Re: Batteries 6-8v or 8-6v

I'm off, San Fran to NYC. I'll check in on the test later. Great spreadsheet AJ, can't wait to see the results. How are the battery prices down your way??
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