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Unread 02-26-2017, 05:26 PM   #11
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Default Re: what is wrong with these battery readings?

Next question for the experts...
I'm getting 875's, so in order to equalize these batteries, what do I use to individually charge them?
I have a 6/12 volt car charger...can I utilize that somehow, or is there a dedicated 8 volt charger? (I've been trying to find an 8 volt charger and can't even find one)
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Unread 02-26-2017, 06:02 PM   #12
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Default Re: what is wrong with these battery readings?

Quote:
Originally Posted by JohnnieB View Post
What should you discharge 8V batteries to when doing a load test?
According to Trojan 80% discharge is the max safe discharge.
1.95 VPC or 7.77 battery volts
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Unread 02-26-2017, 06:05 PM   #13
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Default Re: what is wrong with these battery readings?

Quote:
Originally Posted by Kashmir View Post
Next question for the experts...
I'm getting 875's, so in order to equalize these batteries, what do I use to individually charge them?
I have a 6/12 volt car charger...can I utilize that somehow, or is there a dedicated 8 volt charger? (I've been trying to find an 8 volt charger and can't even find one)
Automotive batteries are very different animals than Golf cart batteries. The construction is different and the charge needs are different. Forget maintaining GC batteries with car chargers. That will cost you
Read a little of my website battery information. It's free and benefits anyone willing to read it.
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Unread 02-26-2017, 07:18 PM   #14
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Default Re: what is wrong with these battery readings?

I understand that Scotty, however, if / when my batteries get out of balance, how should I get them equally charged again?

I will be getting a DPI from you in the next couple of weeks so I have no plans on maintaining the batteries with a car charger.
I was just thinking to get them all charged equally so the DPI maintains the charges equally.
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Unread 02-26-2017, 07:50 PM   #15
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Default Re: what is wrong with these battery readings?

It is not a good idea to do a load test on brand new batteries, they are not ready to be discharged that much.

The battery will not deliver its rated capacity until the plate chemical and physical "formation" process is finished.

That may explain why the dealer is reducing 15% of Trojan's 117 minutes @ 56 amp rating.

I was going to suggest you just reset the OBC and allow it to profile the pack again. Wait a few more discharge/charge cycles to see if it improves.
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Unread 02-26-2017, 08:10 PM   #16
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Default Re: what is wrong with these battery readings?

I have completely removed my OBC as it would not work with the PowerDrive charger anyway (Ver 2.06, need Ver 4.0 or higher). That is why I'm getting the DPI. Plus the float feature was the biggest selling point.
I don't intend to load test the new batteries when I get them....heck I don't even own a load tester.
My main concern is keeping all six batteries at equal charge all of the time.
I have a 12 volt battery in the bagwell, so the only thing the battery pack will power is the cart itself. I want to maintain these properly so I get the most out of them and a long life.
A lot of the threads I read on battery issues stem from batteries not being equally charged

So I was just wanting to find out how to occasionally charge batteries individually (if necessary) in order to keep all six close to the same voltage.
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Unread 02-26-2017, 08:34 PM   #17
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Default Re: what is wrong with these battery readings?

99 minutes of load is a lot of "golf" driving @ 15 mph

Could the cart be draining the batts faster than the load tester?

Brake drag, low tires , accessories ?

51.1 volts full charge seems a bit low
Oops, a day later, a good 100% charge
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Unread 02-26-2017, 08:45 PM   #18
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Default Re: what is wrong with these battery readings?

A new set of,Trojans should pump a starting voltage of 51.5 ish.
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Unread 02-27-2017, 11:34 AM   #19
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Default Re: what is wrong with these battery readings?

Quote:
Originally Posted by Kashmir View Post
I have completely removed my OBC as it would not work with the PowerDrive charger anyway (Ver 2.06, need Ver 4.0 or higher). That is why I'm getting the DPI. Plus the float feature was the biggest selling point.
I don't intend to load test the new batteries when I get them....heck I don't even own a load tester.
My main concern is keeping all six batteries at equal charge all of the time.
I have a 12 volt battery in the bagwell, so the only thing the battery pack will power is the cart itself. I want to maintain these properly so I get the most out of them and a long life.
A lot of the threads I read on battery issues stem from batteries not being equally charged

So I was just wanting to find out how to occasionally charge batteries individually (if necessary) in order to keep all six close to the same voltage.
Since the DPI charger uses dV/dT (change in voltage over change in time) technology to terminate the regular charge cycle before going into the float charge mode, it more or less keeps the batteries in the pack equalized.

A lead-acid battery is fully charged when the SG of the electrolyte ceases to rise while a charging current is passing through it. Since OCV (Open Circuit Voltage) tracks SG, it also ceases to climb when battery is fully charged and in the "Finish" charge phase the DPI monitors the rate of change of the on-charge voltage and terminates that phase when the rate of change falls below a selected rate specified by the battery manufacturer. For example the rate is 4 millivolts per cell per hour for US Battery. I don't know what the rate is for Trojan since they don't publish that information, but it is likely to be in the same neighborhood.

Basically, the weaker cells will continue being charged until the stronger cells are fully charged, which is another way of saying they get an equalization charge. Float charging also tends to keep cells in series in balance.

------------
If they do eventually get out of balance, putting a 12V incandescent light bulb in series with a 12V charger is one way to avoid overcharging an 8V battery. An incandescent bulb is effectively a current regulator. When the battery draws current through the filament, the filament heats and as the filament heats, its resistance increases and drops more voltage, which in turn reduces current flow. A 1141 bulb limits the current to about 2A, a 1156 limits it to about 3A and a 1295 limits it to about 5A.

What you've constructed is a trickle charger, so it can raise the battery voltage past the max safe limit of about 10.8V, but it won't do it quickly like a 12V charger without any restrictions will. However if you limit the amps to 5A or less, 4 to 6 hours shouldn't cause any problems.
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Unread 02-27-2017, 08:16 PM   #20
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Default Re: what is wrong with these battery readings?

Johnnie you asked about the voltage after sitting :

After charging the batteries ( after discharge test) and letting the batteries sit at rest for 48 hours, here are the numbers :


8.6
8.6
8.5
8.5
8.6
8.6

So as you can see, they all do charge up to 100%. So now what do you propose i do about these batteries?
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