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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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11-25-2018, 10:00 AM | #1 |
Not Yet Wild
Join Date: Mar 2018
Posts: 47
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Battery condition - 4x12v
I have 4 12v batteries - Maxx Everstart Model-MAXX-29DC. Date on them is 10-17.
I also have this battery indicator - https://www.ebay.com/itm/Lead-Acid-L...uGw:rk:30:pf:0 It looks like it is drawing 0.01 amps - 10ma or so. I have the EZ-GO Powerwise QE charger. Switch on the cart is in Maint mode. When I got the cart, the thermal battery sensor was not there. I have since installed a 10k resistor it its place. Still collecting some hard data, but the battery "slowly" loses charge after the charger completes. Leaving the + cable connected to the pack does not seem to effect the discharge rate, but it is disconnected for these readings. Other than the 10ma for the meter, there are no other loads on the battery at all. Water level is fine, but did not check SG. During a previous charge, the charge rate was just over 15A. When I checked near the end of the recent cycle, the charger was charging at about 4 amps and 63.9v. Shortly after it completed, I disconnected the charger and the charge indicator showed 94% and I read 51.26v. Over the next two minutes, it dropped to 50.85 at 90%. I know I am relying on a very cheap device for the charge % level, but my meter is accurate and the pack is discharging. Are there different values for different 48v pack configurations? I am about 10% off of this chart. I would like to find a chart that shows a voltage for the top 80-100% or so. I have been just going off of my gut until today, when I took some actual measurements. It has now been 20 minutes off of the charger. Indicator is showing 85% and the voltage is 50.37. This is actually matching the chart a little more closely than is was when the charger was 1st removed. I may be answering my own questions with this data, but what does this discharge rate tell me about the condition of the pack? I will update in a while with new readings as time goes by. Thanks |
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11-25-2018, 10:07 AM | #2 |
......................
Join Date: Apr 2009
Location: FT Lauderdale FL.
Posts: 16,416
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Re: Battery condition - 4x12v
After a complete charge. It take about 12 hours at rest to get a true reading of your battery pack.
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11-25-2018, 10:20 AM | #3 |
Not Yet Wild
Join Date: Mar 2018
Posts: 47
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Re: Battery condition - 4x12v
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11-25-2018, 11:18 AM | #4 |
Gone Wild
Join Date: Jun 2017
Location: Savannah, GA
Posts: 6,539
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Re: Battery condition - 4x12v
Are those deep cycle batteries?
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11-25-2018, 02:44 PM | #5 | |
Gone Wild
Join Date: Nov 2016
Location: near Calgary, AB, Canada
Posts: 1,516
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Re: Battery condition - 4x12v
Quote:
I don't know the MAXX-29DC battery but looking at the specifications, is it NOT design as a golf cart battery ... which are specially designed for high amperage draw of an electric motor. Your batteries are designed for marine and RV use, which have much lower amperage requirements. I suspect that your batteries might be prematurely failing based on being used in a golf cart application ... but the stabilized voltage after charging will help to evaluate that possibility. What sort of run time are you getting from your cart? What cart do you have? |
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11-25-2018, 05:14 PM | #6 |
Not Yet Wild
Join Date: Mar 2018
Posts: 47
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Re: Battery condition - 4x12v
Yes, the batteries are deep cycle - but you are correct, they are likely not designed for golf carts. "Cheap" WalMart marine battery.
Cart is a 2010 TXT. So at about 6hrs after charging, I had 74% and 49.76v. Now, it has been 8 hrs and I am still at 74%, and 49.70v. So nearly stable and the little % gage is pretty much on track with the 48v chart. Not sure on the run time, as I just got the cart and replaced the drive coupling/shaft. Figured I'd give the charging system a once over after installing the resistor. This last charge is the 2nd charge I gave it. With about a week between them, without the cart being operated. So, I charged it, it sat a week, and I charged it again to current condition. Thanks again. |
11-25-2018, 09:50 PM | #7 |
Not Yet Wild
Join Date: Mar 2018
Posts: 47
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Re: Battery condition - 4x12v
Maybe not quite stable yet.
OK, now a full 12hrs later, the indicator says 72% and 49.59v I will check again in the morning - |
11-25-2018, 09:59 PM | #8 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Battery condition - 4x12v
Should be 50.96 fully charged. Your 72% looks to be accurate.
You should start looking for replacements soon, unless you only drive it infrequently and/or short trips before recharging. |
11-25-2018, 09:59 PM | #9 | |
Gone Wild
Join Date: Nov 2016
Location: near Calgary, AB, Canada
Posts: 1,516
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Re: Battery condition - 4x12v
Quote:
Find attached a typical Trojan battery charge profile for your reference. What you describe for charging sounds about right so far. The C20 on the profile is the Amp Hour rating of your batteries at the 20 hr discharge rate. |
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11-25-2018, 10:06 PM | #10 | |
Gone Wild
Join Date: Nov 2016
Location: near Calgary, AB, Canada
Posts: 1,516
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Re: Battery condition - 4x12v
Quote:
Also make note of the voltage of the battery pack when driving under different conditions (soft acceleration, hard acceleration, flat driving, hill driving) ... that might be the final nail in the coffin ... the voltage should not drop to less than 1.75 volts per cell or 42 volts in the case of a 48 volt battery pack. |
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