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03-31-2014, 09:07 AM | #11 | |
Gone Wild
Join Date: Jan 2014
Location: South Georgia
Posts: 1,120
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Re: Rotating Batteries
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03-31-2014, 10:37 AM | #12 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Rotating Batteries
Quote:
That might explain having a lower On-charge voltage and using more water, since they would be the first to reach the gassing stage and might go deeper into it, but I don't know one way or the other. Personally, I'm too lazy to juggle 70 pound batteries around, so if my battery pack gets too far out of balance, I'm going to use equalization charging or individual charging to get them back in line. |
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03-31-2014, 10:56 AM | #13 |
Not Yet Wild
Join Date: Dec 2013
Location: North Texas
Posts: 21
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Re: Rotating Batteries
I am new to working with DC power so please correct me if I am wrong.
The current measurement most people refer to is taken in sires of the entire battery string and is just a sum of the string. Isn't it possible that due to internal battery factors i.e. sulfation that the current could be different along the pack? Once the charging current falls below 10 amps you could insert your current meter between various batteries along the string and come up with differ values? |
03-31-2014, 12:11 PM | #14 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Rotating Batteries
Quote:
2. No, the current is the same at all points in a series circuit. However, the voltage across each component in the series string can be different and the voltage On-Charge battery voltage will vary according to the battery's internal resistance, which depends of the sulfation of the plates, state of charge, temperature of the electrolyte and some other factors. 3. No need to. One ammeter anywhere in the circuit will tell what the amp flow is at any other point in the circuit. You are on the right track, but either mixing up Volts and Amps or series and parallel circuits. Hang in there, the fog will lift. |
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03-31-2014, 12:31 PM | #15 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Rotating Batteries
Voltage drops at any point in a series circuit that has resistance. Current in = current out. That's the law.
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03-31-2014, 12:54 PM | #16 |
Gone Wild
Join Date: Jan 2012
Location: Jarrettsville, MD
Posts: 326
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Re: Rotating Batteries
Thanks for the lively and informative discussion! Things were pretty boring on the forum yesterday so I thought I would ask a stupid question to stir things up.
Just to clarify something, the batteries in question are number 3 & 4 going from 36+ to 36- cables to the controller. The would be the 2 batteries on the far left of the cart which to me is the middle of the series. Temperature should be no more issue for them than it is for the two on the right side. |
04-01-2014, 08:57 AM | #17 |
Gone Wild
Join Date: Jan 2014
Location: South Georgia
Posts: 1,120
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Re: Rotating Batteries
Some carts have six or more batteries. What about the ones surrounded by batteries on three sides?
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04-01-2014, 11:24 AM | #18 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Rotating Batteries
Six battery packs have two that are surrounded on three sides.
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04-01-2014, 01:55 PM | #19 |
Gone Wild
Join Date: Jan 2014
Location: South Georgia
Posts: 1,120
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Re: Rotating Batteries
I don't think whatever a battery's position in the bank of a set of good batteries properly installed (no taps to power lower voltage devices) in a typical golf cart is going to make any significant difference.
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04-01-2014, 02:03 PM | #20 |
Stay thirsty my friends!
Join Date: Jan 2007
Location: Suburban Chicago
Posts: 24,291
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Re: Rotating Batteries
The amount of water a golf cart battery consumes is directly related to how difficult it is to fill. The difficult ones ALWAYS require more service. Murphy's Law.
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