|
Electric Yamaha Electric Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
|
Thread Tools | Display Modes |
05-05-2016, 12:48 PM | #1 |
Not Yet Wild
Join Date: Apr 2016
Location: Drunken Slumber, Wisconsin
Posts: 33
|
Linearity of discharge?
I'm sure you've covered this at some point but I don't see it in my searches. How linear or consistent is discharge from 100% to a given point? Does a pack drop quickly off 100 and slow it's descent or vice versa? Or does it just consistently drop until dead? I'm referring to a pack under load, not just sitting idle.
|
Today | |
Sponsored Links
__________________
This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum |
|
05-05-2016, 02:41 PM | #2 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,173
|
Re: Linearity of discharge?
I assume you mean pack Voltage. No it is not linear.
|
05-05-2016, 11:26 PM | #3 |
Not Yet Wild
Join Date: Apr 2016
Location: Drunken Slumber, Wisconsin
Posts: 33
|
Re: Linearity of discharge?
According to the US Battery 48v chart, my pack at 100% should read about 51.3v. At 60%, at the lowest recommended discharge the pack would be about 49v. I give 2 scenarios, which is more likely with all factors equal (flat ground, consistent throttle, weight, speed, etc)?
1. Battery pack holds around 51.3v for several miles, and then begins to drop at a noticeable rate over the next few miles and I stop at 49v and charge it. Or 2. Battery pack drops quickly from 51.3v within first mile or two, and slowly creeps down to 49v, at which point I stop to charge it. I am just trying to get a good idea how this should play out... |
05-06-2016, 04:53 AM | #4 |
Gone Wild
Join Date: Jun 2014
Location: Sunset Bay, TN
Posts: 2,390
|
Re: Linearity of discharge?
In my case my cart gets drove for a little over a mile of up & down hills down to the marina where it then sits for a few hours and then repeats, the voltage of the pack if given a short recovery time comes right back up to 100 % SOC on each end of the leg so that definitly not linear at all... If I continue with using the cart for more than a couple miles the drop is fairly predictable with the voltage dropping more sharply as I get toward the 10 to 12 mile worth of use. Now keep in mind that my use is all very hilly.
|
05-07-2016, 07:43 AM | #5 |
Not Yet Wild
Join Date: Apr 2015
Posts: 4
|
Re: Linearity of discharge?
So for those that don't know me (I know 2 or 3 members personally), I'm a Director level employee of the maroon deep cycle battery manufacturer discussed frequently on this site and sometimes confused for a prophylactic manufacturer.
The discharge curve of a deep cycle battery is not linear. When first applying current (putting the pedal down) the voltage drops quickly, then recovers. For a period of time (generally to 80% depth of discharge or so), the curve is fairly linear. However, from 80% to 100%, the curve starts to drop pretty dramatically. Bear in mind, that in the last 20%, the motor has to work harder to get the remaining energy out of the battery. Also bear in mind that most carts are designed in a way so not to discharge the pack beyond ~80% depending on the cart. This image is a basic depiction of what the curve looks like: |
05-07-2016, 11:43 AM | #6 |
Not Yet Wild
Join Date: Apr 2016
Location: Drunken Slumber, Wisconsin
Posts: 33
|
Re: Linearity of discharge?
Exactly what I was looking for. Thanks guys!
|
05-07-2016, 09:12 PM | #7 | |
What the ....?
Join Date: Jan 2007
Location: N.E. Wisconsin
Posts: 14,928
|
Re: Linearity of discharge?
Quote:
Never once has someone asked about batteries for their prophylactics! But, seriously... Welcome to BGW with your first post! Trojan batteries ROCK! |
|
05-07-2016, 10:42 PM | #8 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
|
Re: Linearity of discharge?
Hmm, looks fairly linear to me, given a predetermined load. Much Unlike lithium batteries.
|
|
|
Similar Threads | ||||
Thread | Forum | |||
Excessive Discharge | Electric EZGO | |||
Surging and discharge?? | Electric Club Car | |||
1% a day self discharge?? | Electric Club Car | |||
self discharge and charging | Electric Club Car | |||
How Much Do Batteries Discharge While Not Being Used | Electric EZGO |