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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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05-27-2020, 08:26 PM | #1 |
Not Yet Wild
Join Date: May 2020
Location: St Augustine, FL
Posts: 24
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2009 RXV slows to a crawl, but runs after charge?
Just had noticed some weird behavior with my 2009 RXV. Battery gauge showed 1/2 and slowed to a crawl and limped it home. Did some research and a lot of signs point to bearing encoder.... But I stuck it on the charger for 45 mins and it was back to performance as normal... is that typical with a bad bearing encoder?
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05-27-2020, 09:54 PM | #2 |
Not Yet Wild
Join Date: May 2020
Location: St Augustine, FL
Posts: 24
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Re: 2009 RXV slows to a crawl, but runs after charge?
So im guessing I might just have an inaccurate battery gauge.... Charging overnight and we'll try it tomorrow.
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05-27-2020, 10:49 PM | #3 |
Gone Wild
Join Date: Sep 2016
Location: Northern California
Posts: 1,300
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Re: 2009 RXV slows to a crawl, but runs after charge?
The only help I can offer is to get a dvm to get a good reading on your batteries. Do it 10-12 hours after they come off the charger and again when the cart is acting up.
What kind of batteries and how old are they? |
05-28-2020, 12:04 AM | #4 | |
Not Yet Wild
Join Date: May 2020
Location: St Augustine, FL
Posts: 24
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Re: 2009 RXV slows to a crawl, but runs after charge?
Quote:
After some digging on the forum it sounds that I shouldn稚 be running down the batteries this way. |
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05-28-2020, 12:26 AM | #5 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: 2009 RXV slows to a crawl, but runs after charge?
Yep, and you didnt mention if it was the OEM "needle gas gauge" style meter. If so, it doesnt even know or care about battery state of charge, it only displays what the controller has reported charge level is, it's just a indicator that's instructed by the controller what to say. No need to "kill the messenger" & waste your money on a new OEM gauge that will display the exact same thing (as reported by the controller).
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05-28-2020, 06:40 AM | #6 |
Getting Wild
Join Date: Apr 2020
Posts: 95
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Re: 2009 RXV slows to a crawl, but runs after charge?
This is information that I researched over the past month as I'm new to electric and carts all together. This is the a crash course every electric cart owner should get.
As others have said, you need to get an accurate reading off the battery pack after a good charge. If you picked it up a couple weeks ago and have never charged it, you probably ran the batteries way down. It doesn't a require a fancy handheld, and a $7 one from Harbor Freight will do the job. You can also get a digital volt meter from a site sponsor for pretty cheap. https://www.cartsunlimited.net/battery-meters.html The biggest "head turner" for me was what battery readings should be and how low you should let your voltage drop: I just assumed a 36V cart should be 36V. However, a full 36V pack should be reading 38.2V from Battery 1 Positive to Battery 6 Negative. If you're a 48V cart, the reading should 50.93. As said before, these reading should be taken 12 Hours after a charging cycle. Try not to drop your battery pack's voltage below 36.31V or 48.41V for 36V and 48V carts respectively. Keep water in them. The previous owner of my cart didn't know what he was doing. My battery pack would never hold a 38.2 charge (still doesn't). I checked the water and it took nearly a gallon of distilled water to fill them where they needed to be. After a month of initiating multiple charge cycles, I've slowly risen my pack charge to 37.7-37.9 versus the 37.3-37.4 where I started. Not sure I'll ever get them back to 38.2. However, the life of them is much better. I'm assuming all your cables are clean and free of corrosion? Plug your cart in every night if possible. Also, if you're riding small spurts throughout the day, I've read that you shouldn't plug in every time. Just drive it until you start approaching that 36.31V mark. Again, having the digital meter always showing helps. Give the cart a few minutes to rest/recover before using the Voltage displayed. It will usually gain a few .xV after sitting, so it's not as low as you think. When driving, try not to mash the pedal from a stop. Also, if you don't have to have top speed, don't travel at 100% throttle all the time. Reducing the load/demand on the battery pack will just help you get that much more run time out of them. |
05-28-2020, 07:27 AM | #7 | |
Not Yet Wild
Join Date: May 2020
Posts: 15
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Re: 2009 RXV slows to a crawl, but runs after charge?
Quote:
I have a digital volt meter that I installed in my cart and it definitely drops below that during acceleration. But now that I知 thinking about it. I tapped into the wires for the factory state of charge meter to get the reading. So really I知 reading what the controller is reporting and possibly not actual pack voltage? I probably need to move my connection directly to the battery pack and not tap into the Factory SOC connector? |
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05-28-2020, 08:05 AM | #8 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: 2009 RXV slows to a crawl, but runs after charge?
Quote:
With lead/acid batteries, always plug in the charger after EVERY use if you can. It is called opportunity charging. To wait until the voltage drops to a certain point before charging ensures that you will damage cells in your pack with sulphation. Dealers love to tell cart owners these things so they can sell them replacement batteries more often... |
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05-28-2020, 08:57 AM | #9 | ||
Getting Wild
Join Date: Apr 2020
Posts: 95
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Re: 2009 RXV slows to a crawl, but runs after charge?
Quote:
Quote:
Is this incorrect? If so, apparently what I had read about "opportunity charging" or "topping off" on Lead Acid versus Lithium was wrong. |
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05-29-2020, 05:58 PM | #10 |
Not Yet Wild
Join Date: May 2020
Location: St Augustine, FL
Posts: 24
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Re: 2009 RXV slows to a crawl, but runs after charge?
Thanks guys for the good info. I had found the battery voltage and recommended charging practices after I had created the post and it definitely gave me the crash course on batteries and charging.
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