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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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08-23-2019, 03:53 PM | #1 |
Gone Wild
Join Date: Jun 2014
Location: Sunset Bay, TN
Posts: 2,390
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Navita Controller
What's the scoop on Navita Controller's? Neighbor had A 500 amp one put in his cart and it's not performing as it should . It's still got some crappy cables but I'm not sure if that's his only issues.
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08-23-2019, 09:19 PM | #2 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Navita Controller
Can't expect any performance with junk cables. Imagine running a foot race while breathing through a drinking straw.
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08-24-2019, 08:24 AM | #3 |
Gone Wild
Join Date: Jun 2014
Location: Sunset Bay, TN
Posts: 2,390
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Re: Navita Controller
Thanks, that was one of my most repeated comments to my friend was that the cables sold to him were junk as far as carts were concerned and barely acceptable in the automotive field. Told him to question the shops use of such low quality cables and why install a 250 amp main fuse on a 500 amp controller...
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08-24-2019, 05:38 PM | #4 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Navita Controller
The 250a fuse may not be the problem you think it is. I usually see "slow reacting fuses" on golf carts. Here's one example of the characteristics of a 200a slow reaction fuse. You may be shocked.
First column is amps required to melt, second column is time to melt. 6000a - 0.01s 2500a - 1.0s 1700a - 2.0s 1000a - 10.0s 450a - 100s 350a - 200s 250a- 1000s 200a - forever As you can see, given the typical usage characteristics of even a high performance golf cart, even this little 200a fuse would likely never blow, even with as big of a golf cart controller you might find. |
08-25-2019, 10:44 AM | #5 |
Gone Wild
Join Date: Jun 2014
Location: Sunset Bay, TN
Posts: 2,390
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Re: Navita Controller
Agian thanks, learning this as I go. Was just hard for me as my only GC experience is with my CC and my 500 amp Curtis controller has no mention of main fuses. I'm thinking his biggest issue is cables as its a mix of low quality 4 gauge and some 6 gauge cables too...
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08-25-2019, 11:12 AM | #6 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Navita Controller
Quote:
I'm speculating, but I don't think there are many, if any, motors typically used in EZGO golf carts that will draw over 500A during normal operation, and if they do they probably won't draw it more than 0.1 Seconds. |
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08-25-2019, 12:07 PM | #7 |
Gone Wild
Join Date: Jun 2014
Location: Sunset Bay, TN
Posts: 2,390
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Re: Navita Controller
So a 250 amp fuse is ok on a 600 amp controller? It's not popped yet, so I'm assuming it's ok...
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08-25-2019, 12:55 PM | #8 | |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Navita Controller
Quote:
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08-25-2019, 01:03 PM | #9 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Navita Controller
Quote:
From an electrical point of view, just because a controller can pass 600A doesn't mean the motor it is attached to can draw 600A. Since the 250A fuse isn't blowing, the motor isn't drawing over 250A for excessive periods of time, or up to 600A for extended periods of time. If it blows, replace it with a 400A fuse. |
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08-25-2019, 02:12 PM | #10 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Navita Controller
Quote:
I did manage to record 504A through the armature with 39.9V applied on one test run, but they were mostly less than the 460A peak the XCT 400 will pass, so I got the XCT48400 instead of waiting for the XCT48500. The highest armature amps I've recorded with the XCT is just over 400A, but I've not started from a standstill on an incline, nor do I plan to. In other words, my experimenting more or less verifies what you've said. |
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