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11-15-2010, 08:38 PM | #1 |
Not Yet Wild
Join Date: Sep 2010
Posts: 61
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Voltage reading question
I just installed new Trojan 875's and put in a new voltage meter/reader, I've read scotty b's post on batt. break in and would just like to know when do I judge the pack to be 50%. Is it while the cart is running or at rest. thanks, I just finished my first build and will post pics soon. Need to GPS the speed, but it is plenty fast for me........
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11-15-2010, 08:48 PM | #2 |
Gone Wild
Join Date: Jun 2010
Location: East Texas
Posts: 602
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Re: Voltage reading question
What meter did you put in? I would go off of my DMM and check it with your meter several times and go from there. Remember, you need to charge these batteries each day you use it.
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11-15-2010, 09:02 PM | #3 |
Gone Wild
Join Date: Sep 2010
Location: Mia, Fl.
Posts: 424
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Re: Voltage reading question
Think his question is, that for break in period, he shouldn't drain the new batteries to less then 50%. Is that 50% reading taken while the battery pack is at rest? Anyhow, I would say that the answer is when the cart is at rest otherwise you would be doing a load test instead if you take the reading while (movin) accelerating.
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11-15-2010, 09:31 PM | #4 |
Gone Wild
Join Date: Jun 2010
Location: East Texas
Posts: 602
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Re: Voltage reading question
That is why I said to use the DMM to get the voltage reading and compair it to the new meter to see where exactally it is on his meter compaired to the DMM. Do it several times until you feel it is accurate. Dont run them below 50% anytime and charge them fully after each use.
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11-15-2010, 09:48 PM | #5 |
Gone Wild
Join Date: Sep 2010
Location: Mia, Fl.
Posts: 424
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Re: Voltage reading question
Colby, think you missed a part of his question again. "Is it while the cart is running or at rest"....
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11-15-2010, 09:53 PM | #6 |
Gone Wild
Join Date: Sep 2009
Location: Forest City N.C.
Posts: 2,660
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Re: Voltage reading question
just run it but dont run it till it quits and charge it. Its like filling it up with gas.Just keep topping it off,it will be better each time you do it.
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11-15-2010, 11:26 PM | #7 |
Gone Wild
Join Date: Jun 2010
Location: East Texas
Posts: 602
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Re: Voltage reading question
At rest! Just the same as you wouldn't check the state of charge while the charger is still on or just shut off.
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11-15-2010, 11:47 PM | #8 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,417
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Re: Voltage reading question
I thought the 2nd part of his question was just exactly where is 50% of state of charge?
This is the state of charge chart as taken from the Trojan Battery Co. It is fairly accurate |
11-16-2010, 01:03 AM | #9 |
Not Yet Wild
Join Date: Sep 2010
Posts: 61
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Re: Voltage reading question
I probably made a mistake and bought a cheap state of charge meter, it is the 48 v model. I was looking at the meter at rest and thought i was getting close to 50%, but after a afternoon trip w/ kids the cart suddenly started going slower. I did make it home and voltage tested the pack and got 46.?? I will need to remember that 50% on my meter is about 20-30% in reality. Do yall think I hurt the pack by doing this one time. I am only on the second full charge now. thx.....
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11-16-2010, 06:50 AM | #10 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,417
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Re: Voltage reading question
Sulfation of Batteries starts when specific gravity falls below 1.225 or voltage measures less than 12.4 for a 12v battery, or 6.2 for a 6 volt battery. Sulfation hardens on the battery plates reducing and eventually destroying the ability of the battery to generate Volts and store Amperage.
Any time this happens isn't good. The damage is small but accumulative each time this happens. Buy good quality meters and always check them against one or better yet 2 good DVM. You do not need to take the batteries down to 50% when new to recharge. 75% and recharge does the same thing. Actually it is better as it the recharge not the draw-down that you are trying to get done 10-20 times to break them in.... |
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