|
Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
|
Thread Tools | Display Modes |
07-29-2019, 06:51 PM | #31 | |
Gone Wild
Join Date: Apr 2019
Location: Canada
Posts: 420
|
Re: 2008 RXV Rebuild: Lord Humungus
Quote:
Also, do you have any photos of a disassembled Curtis 350 controller? Curious to see the MOSFET layout on it. Trying to figure out how it is "double" the amps works. Here is what a Danaher looks like for those curious: Danaher1.jpg Danaher2.jpg I have it sitting next to me so I can take better high-rez photos for anyone who wants to see the parts closer. |
|
Today | |
Sponsored Links
__________________
This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum |
|
07-29-2019, 08:16 PM | #32 |
Gone Wild
Join Date: Feb 2019
Location: God's Country America
Posts: 883
|
Re: 2008 RXV Rebuild: Lord Humungus
|
07-30-2019, 12:15 AM | #33 | |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
|
Re: 2008 RXV Rebuild: Lord Humungus
Quote:
Imagine supercharging your stock cast crank, cast rod, cast piston gas engine to triple its original power, and add some nitrous for extra mid range punch....yeah, it's gonna break real soon. (It's not quite that simple, but just for explaining it). The "just how does that work" goes like this. 3 phase AC systems by their nature have "3 channels" ("U", "V", and "W" as their known in the USA). As far as I know about this rating system goes like this... Curtis rates each of their channels at 235a, and calls it a 235a controller (but the stock software limits capabilities greatly, that part I can confirm). It is suggested that Navitas adds their numbers amongst the 3 phases together to get a great looking "high score" total far above the stock controller. 200 x 3. (I have no reason to refute that suggestion, many controller makers/rebuilders do this, in all controllers, not just AC). The aftermarket software is set more agressive, and not constrained by a big group of lawyers with "future problems" in mind. Ezgo sets things with possible warranty claims, and "we ****** up" lawsuits in mind, they sell tons of fleet vehicles to courses where the user is "rental car, not my problem" mindset. Issues that aftermarket aren't as much exposed to. The stock controller can damage stock parts, and the Curtis 350 when set to "Kill" WILL eventually damage stock axle mount parts on newer RXVs (I know, because I have done it more than once). If I owned a "bad azz" rxv, I would weld the mounting pads to to the axle tubes (and have done so before). We aren't talking just marketing numbers, nor mythical unicorns here. Bob knows, and I know. (Some others do too). |
|
07-30-2019, 09:24 AM | #34 |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
|
Re: 2008 RXV Rebuild: Lord Humungus
Well said cgtech! So the Navitas, if rated the way Curtis rates controllers, would be a 200 Amp controller. And the stock 235 Amp Curis controller, if rated like Navitas does it, would be a 705 Amp controller. And the 350 Amp Curtis would be 1050 Amps if rated like the Navitas. Navitas performs because they set it for max Amps of what the hardware is rated. Curtis turns theirs down to a fraction of the rating. When we reprogram, we only set it to run at max rating, and no more than that. It's simple really, the curtis inverter output is much beefier than the Navitas is. It is possible, in software, to turn some stock 235 Amp Curtis controllers up to 800 Amps per phase! I will never do that. That would be begging for something to break! I have seen axles snapped with them just set to their rating of 235 Amps and used for drag racing...
|
07-30-2019, 12:56 PM | #35 | |
Gone Wild
Join Date: Apr 2019
Location: Canada
Posts: 420
|
Re: 2008 RXV Rebuild: Lord Humungus
Quote:
|
|
07-30-2019, 01:02 PM | #36 |
Gone Wild
Join Date: Apr 2019
Location: Canada
Posts: 420
|
Re: 2008 RXV Rebuild: Lord Humungus
Not my cart but saw this the other day...
EzGo RXV 2012 (danhar origionally) Navitas 600amp controller, 20s1p lithium setup using Nissan leaf batteries on 20.5" tall tires. RXV-Navitas600amp.jpg So I can't even imagine what a configured 350 Curtis would do! Yikes. |
07-30-2019, 01:14 PM | #37 | |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
|
Re: 2008 RXV Rebuild: Lord Humungus
Quote:
It is 3 phase so you need to use vector math to find out the equivalent "supply" current at maximum load, but I think it would be less than double (around 1.73) at worst case scenario. |
|
07-30-2019, 01:50 PM | #38 | |
Gone Wild
Join Date: Apr 2019
Location: Canada
Posts: 420
|
Re: 2008 RXV Rebuild: Lord Humungus
Quote:
My thinking too that it can't be "double". But, considering I had the RXV with a Navitas controller going 35mph without issue I am trying also to figure out what the performance difference really is between the Curtis and Navitas setups. I know what the price difference is in Canadian dollars. But, still confused as to what the actual performance difference is. |
|
07-30-2019, 02:14 PM | #39 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
|
Re: 2008 RXV Rebuild: Lord Humungus
Top speed doesn't mean much, almost all the Curtis rxv controllers can spin the motor to 9600 rpm.
And "fudging the numbers" & testing under unrealistic conditions is more prevalent than you may think, just look at the CTS rebuilt "short case" Curtis series controllers claiming 600a, if your buying that one, I got a bridge to sell you. |
08-01-2019, 05:04 PM | #40 | |
Gone Wild
Join Date: Apr 2019
Location: Canada
Posts: 420
|
Re: 2008 RXV Rebuild: Lord Humungus
Quote:
|
|
|
Thread Tools | |
Display Modes | |
|
Similar Threads | ||||
Thread | Forum | |||
2008 CC Carryall Rebuild | Gas Club Car | |||
praise the lord, praise the lord | Electric Club Car |