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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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08-24-2011, 08:45 AM | #21 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,356
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Re: Digital Volt Meter
It's on it's way ........ Pete
Just to clarify the Trojan Battery co. Does say a maximum discharge of 80% is allowable or recommended BUT when questioned about deep discharges versus shallow discharge with respect to battery useful lifespan, they responded with this chart. Basically what is shows is their battery could handle 700 deep discharges or 5000 shallow discharges. FYI Mathematically speaking, this means if I recharge my batteries everyday, they will last 13.6 years. Check the water often |
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08-24-2011, 01:50 PM | #22 | |
Gone Wild
Join Date: Mar 2009
Location: Roseville, CA
Posts: 2,757
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Re: Digital Volt Meter
Quote:
The trip was done with a GPS and distance covered was 16 miles with the last 1/2 of the trip with the lights on. The chart starts out just off the float stage of the charger at 52.7v and as you start to drive it quickly bleeds off the surface charge then settles into a steady decline ending at the 3rd light where the test was terminated. |
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08-24-2011, 05:42 PM | #23 |
no clue
Join Date: Sep 2009
Location: spicewood, texas
Posts: 3,308
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Re: Digital Volt Meter
thx. doug.7.5 bars= 70%. 3 bars =50%. that's easy to remember. have both gauges, so will be easy to monitor. when you get down to about 7 bars, it's time to turn around if you don't want to run below 50%, right? great info on how the soc meter works.
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08-24-2011, 06:45 PM | #24 |
Gone Wild
Join Date: Jul 2011
Location: Panama City, Fl.
Posts: 401
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Re: Digital Volt Meter
When you turn around vs power left would also be effected by the path to home.....how smooth/rough and closeness. I always figure with off road 4x4 (which is a lot like carting concerning gas and elec.), I would use 1/3 of my fuel going out...then I had two thirds to get back on and play a bit more on the way back.
I am still seeing the potential for my first cart so I am a bit cautious at this point..... |
08-25-2011, 08:39 AM | #25 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Digital Volt Meter
Quote:
According to the chart, if you only discharge the batteries 12% daily and recharge them daily, they will last approximately 13.7 years. (5000/365) However, from the same chart, if you discharged the batteries 12% daily, but only recharged them weekly (84% discharge) they would last about 14.4 years. (750/52) Of course, this does not take into account the physical damage done to the battery's plates when they are deeply discharged and recharged from a deeply discharged state. So you won't actually get longer battery life from charging less often. I suspect Trojan assumes the batteries are recharged daily, so it is how deeply they are discharged daily that determines the theoretical life span. Bottom line: Recharge as often as possible and avoid deeply discharging batteries as much as possible for longest battery life. Plus: Keep them clean and watered. FWIW: The left column of numbers on the chart is % of Discharge, which is the opposite of the State of Charge, the term usually used on BGW when talking about batteries usage and maintenance. That subtle fact had me going in circles for a couple minutes the first time I saw the chart and I've been reading graphs and crunching numbers most of my 68 years |
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08-25-2011, 08:44 AM | #26 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,356
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Re: Digital Volt Meter
Yes, I had to stand on my head to read it the first time
This is all good info' Let us know what the 2 meters side by side read Madoc, of course rach pack will vary a little bit. Doug's batteries seem quite healthy |
08-25-2011, 08:50 AM | #27 |
Gone Wild
Join Date: Jul 2011
Location: Houston, TX
Posts: 2,901
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Re: Digital Volt Meter
Call me when my controller comes in. I want to add something else to the list
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08-25-2011, 08:51 AM | #28 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,356
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Re: Digital Volt Meter
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08-25-2011, 08:55 AM | #29 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Digital Volt Meter
Quote:
The electrolyte stratifies during use (Interface barrier effect or something like that) so the terminal voltage increases as the electrolyte reaches an equilibrium after use terminates. Were the voltage readings taken the moment each LED turned off, or was the battery allowed to rest for a few minutes to recover? I'm just curious, the chart would be about the same either way. Also, was elapsed time and/or distance traveled between each LED going off recorded? |
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08-25-2011, 08:58 AM | #30 |
Gone Wild
Join Date: Jul 2011
Location: Panama City, Fl.
Posts: 401
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Re: Digital Volt Meter
So.....anyone getting 13 years of use from their batteries? What is the normal time to battery death?
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