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Unread 01-07-2009, 02:07 PM   #11
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Default Re: Battery discharge

If your overnight readings have dropped that much, then the outcome should be obvious. Time for batteries

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Unread 01-08-2009, 12:14 AM   #12
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Default Re: Battery discharge

Thanks for all the info. Changed the one battery and the unit is behaving very well. Will run for a few days then check the batteries again after a full charge.
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Unread 01-08-2009, 12:33 AM   #13
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Default Re: Battery discharge

You may be running your batteries down too low what is the reading BEFORE charging????
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Unread 01-08-2009, 01:02 AM   #14
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Default Re: Battery discharge

they are running 8.1 to8.3 I figured if they were over 8 it should be ok - am I wrong?
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Unread 01-08-2009, 01:35 AM   #15
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Default Re: Battery discharge

He means you may be running your batteries down to low before you charge them....You said you would run it for a few days then check after charging. Running for a few days is what raised the question. If you don't use it that much it'll probly be fine. If you use it often over a few days you may be taking the batts down to far before a charge. It all depends on usage really. You never want to take the pack below 80% of capacity or damage to the batteries can result.

8.1 isn't real good at all unless your considering that needing to be charged... an 8 volt battery at 8 volts is DEAD! Kinda strange but it's true. Each cell produces over 2 volts....I forget exactly what each one produces but at 8 volts the battery is considered dead. A 12 volt car battery at 12 volts is dead and will barely turn over a car engine. Somewhere some smart marketing people got paid a lot of money to come up the bright idea they should call them less than they actually are.
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Unread 01-08-2009, 01:42 AM   #16
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Default Re: Battery discharge

Thanks - will check the levels tomorrow and do a charge.
Frank
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Unread 01-08-2009, 08:14 AM   #17
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Default Re: Battery discharge

Welcome to the forum Numbersplus.................
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Unread 01-08-2009, 04:27 PM   #18
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Default Re: Battery discharge

Quote:
Originally Posted by roady89 View Post
8.1 isn't real good at all unless your considering that needing to be charged... an 8 volt battery at 8 volts is DEAD! Kinda strange but it's true.
Depending on how the neasurement is taken 8.1 volts on a 8 volt battery indicates about 55% State of Charge.

State of Charge if taken correctly can indicate the percentage of th echarge level of a battery. The trick is knowing hot to take the measurement. Fist trick is it take a really accurate 4-1/2 digit volt mater, which means expensive like a Fluke model 87 with .1% accuracy.

OK assuming you have a good volt meter, you charge the batterues up, let them rest 3 hours with no load or charge current, and measure each battery in a open circuit condition, meaning no current flow.

What follows is the reading for 2 volt cells. Just multipy b 3, 4, or 6 to derive your 6, 8, and 12 volt battery.

100% = 2.12
90% = 2.08
80% = 2.07
70% = 2.05
60% = 2.03
50% = 2.01
40% = 1.98
30% = 1.96
20% = 1.93
10% = 1.89
0% = 1.75
Replace at less than 1.75

Now this may sound looney to a lot of you but to maximise battery life, never discharge more than down to the 80% range if you can help it. I would be getting concerned if you start pushing 50% between recharges. So the motto is recharge after every use.
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Unread 01-09-2009, 03:49 PM   #19
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Default Re: Battery discharge

Quote:
Originally Posted by dereckbc View Post
Depending on how the neasurement is taken 8.1 volts on a 8 volt battery indicates about 55% State of Charge.

State of Charge if taken correctly can indicate the percentage of th echarge level of a battery. The trick is knowing hot to take the measurement. Fist trick is it take a really accurate 4-1/2 digit volt mater, which means expensive like a Fluke model 87 with .1% accuracy.

OK assuming you have a good volt meter, you charge the batterues up, let them rest 3 hours with no load or charge current, and measure each battery in a open circuit condition, meaning no current flow.

What follows is the reading for 2 volt cells. Just multipy b 3, 4, or 6 to derive your 6, 8, and 12 volt battery.

100% = 2.12
90% = 2.08
80% = 2.07
70% = 2.05
60% = 2.03
50% = 2.01
40% = 1.98
30% = 1.96
20% = 1.93
10% = 1.89
0% = 1.75
Replace at less than 1.75

Now this may sound looney to a lot of you but to maximise battery life, never discharge more than down to the 80% range if you can help it. I would be getting concerned if you start pushing 50% between recharges. So the motto is recharge after every use.
Unless you just don't ride much each time, staying in the range of 100%-80% isn't "real life" for many.

That is why a high quality golf cart battery is so expensive but still a must for electric carts. They are designed to take the deep discharge.

Think of it this way. Golf courses routinely run a cart 36 holes before charging. Figure 20+ miles for two rounds. More if you're a hacker! Probably down to 30-40% range from above. Yet, even though they deep discharge these carts, the batteries typically will make about 3 years on these fleets with proper maintenance. What battery can stand this cycle? By now, you should know. It's Trojan.
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