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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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10-23-2015, 11:16 PM | #11 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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Re: Need help with Speed Controller
Johnnies 400 is peaking at $60 amps and has sustained outputs equal to a DCX500. You can't compare ratings you need to compare output. AND johnnie has 2g cables because he bought them for his 500DCX.
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10-23-2015, 11:31 PM | #12 | |
Not Yet Wild
Join Date: Sep 2011
Posts: 27
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Re: Need help with Speed Controller
Quote:
Thank you for the responses.....I am going to install 2 gauge throughout the cart this week and see it the singing noise stops. Small steps to get to the problem. I just ran the cart at night with 4 people on it for 5 miles with several stop and goes and it did fine.....the temp of the 4 gauge cables was 110 to 130.....the speed controller was the same..... Thank you again.... |
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10-24-2015, 06:59 AM | #13 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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Re: Need help with Speed Controller
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10-24-2015, 09:48 AM | #14 | ||
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Need help with Speed Controller
Quote:
Quote:
The cart was only 3 year old when I got it and the OEM cables were not visibly corroded and appeared to be in like new condition physically, but having worked with electrical and electronic gadgets for 50+ years, I detest crimped on connectors and proactively replaced them. I'm also a bit OCD about efficiency and 2Ga passes amps 59% more efficiently than 4Ga, so I went with 2Ga, which would also allow me to go up to 500A with acceptable (to me) cable losses. FWIW: I had access to a milli-ohmmeter with 4-wire test leads. so I measured the 2Ga cables before I installed them and measured the OEM cables they replaced. Like I mentioned , the OEM cables were only 3 years old and looked good to a critical eye, but the all had several milliohms of resistance while only the longest of the 2Ga silver soldered cables registered anything of the milli-ohmmeter. The display only resolved down to 0.001Ω, but the least significant digit was flickering back and forth between 0 and 1, so the resistance of the longest of the 2Ga cables was roughly 0.0005Ω, which is the nominal resistance for 3 feet of AWG 2Ga copper. Needless to say, my cables barely get warm even when my motor climbs above 200°F and my controller approaches 120°F. Ironically, Alltrax appears to have revised their cable size recommendations. Attached is a snapshot of the lower right area of their XCT in a PDS wiring diagram. Personally, I wouldn't put 6Ga cables on anything bigger than a mobility scooter, but like I said, I'm an efficiency nut. |
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10-24-2015, 10:54 AM | #15 |
Not Yet Wild
Join Date: Sep 2015
Location: Shippensburg PA
Posts: 50
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Re: Need help with Speed Controller
It could be time to clean all your connections? Maybe you have a less than optimal resistance on some or all of your cable lugs? How is your battery pack voltage measured at the pack when the problem arises?
New cables are probably in order, but it doesn't cost anything to clean all your connections for a test. |
10-24-2015, 09:46 PM | #16 |
Not Yet Wild
Join Date: Sep 2011
Posts: 27
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Re: Need help with Speed Controller
Thank you for all the help. Just ordered new cables (2gauge). Going to install and see how that helps. I'm sure it's going to be a big difference
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