RXV Delta Q vs Yewy

Meangreen79

I have a 10 RXV that I installed the EZGO SOC meter on 2 years ago. Never went above 3/4 charge with new Trojans from the start with the DeltaQ. Anyway my Trojans only lasted 2 years with mostly minimum use but heavy use for a couple weeks in the summer. Always kept plugged in and constantly unplugging and plugging back in weekly during winter. Anyways just ordered a Yewy for one of my friends cart that I maintain so I ordered myself one as well. Should be here Friday. Installed 4 new Trojans last week and I also installed this new meter today to see if my ezgo SOC meter was just off. Same deal with this meter straight off the Delta, 80%. No accessories ever run off 1 battery. Always on a 48/12 converter with accessory fuse panel and ground strip. What do you guys think? Will the Yewy raise this SOC number?
Fingers crossed

BGW

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mdav

My Delta charger was doing the same. I ordered a yewey and all is good. The yewey is a far better charger than the deltas.


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Meangreen79

Nice!

Meangreen79

I still only get 80% even on the Yewy for weeks now. All the other RXV's that I work on peg out the stock SOC Meter. I wonder what gives on mine?

kernal

I'm curious. What is your pack voltage when using a handheld digital multimeter?
The reason I ask is because the SOC meters (OEM or aftermarket) that plug into the RXV factory harness are getting the data from the controller. They show what the controller thinks the SOC is. So I'm wondering in your case if there is a difference.

Meangreen79

The hand held readout matches the display readout when tested across mains. The 12hr at rest voltage represents a fully charged pack of 50.9 although the % always says 80%. How could it think 50.9 is 80%? Has done this with two chargers, two sets of batteries and two meters lol. I played 27 holes of golf yesterday on 23" tires and it went down to 60 which is a 25% loss based off of the 80% number. I guess I can just leave it on the voltage screen and monitor that way because I have no idea what to believe is accurate on the % screen.

smokey tennis shoe

The voltage will be dead on. The percentage will never be correct

BobBoyce

The controller calculates SOC based upon the data it collects while driving. You mentioned 23" tires on an RXV. Did you change the rear end gear ratio to low speed gears in order to compensate for such large tires on an RXV? Or did you have your controller recalibrated for the new tire size? Just putting 23" tires on an RXV throws the entire speed vs motor RPM calculation out the window.

The RXV is nothing like the DC carts. It's essentially a computer on wheels, and it is expecting the operating conditions to match how it is programmed to operate. The Operating System is very flexible, but the E-Z-GO VCL (Vehicle Control Language) is expecting motor drive current to fall within a fairly narrow range of programmed settings, over a specified RPM range map. It's very similar to a SepEx motor map, only much more complex, being it is 3 phase AC.

When you put tires larger than 20.5" on an RXV, the VCL cannot correctly calculate the current load for the new, much lower, RPM range that the motor must now operate at. The controller will overheat, repeatedly. You may not even notice it, because it takes longer for the heat to soak out of the FETs and make it to the temperature sensor, so it can begin cutting back on power to try to save the controller. Eventually, the controller will fail, because it is being required to supply more current than it is programmed to deliver at any particular RPM.

An OEM handset can be used to go in there and recalibrate the controller to work better with larger tires, and bring it back into the VCLs operating range. You can reduce the overheat, but it'll still run a little bit hotter than smaller tires would run at. It's a trade-off for a bit of performance loss at the higher speeds.

Or you can upgrade to the 350 Amp Curtis controller and recalibrate it for the tire size. It can be programmed to perform better and have no controller overheat issues. The motor will run hotter though, with the higher current.

Bob

Meangreen79

Thanks Bob. That is fantastic information and I appreciate it. I’m going to look into this controller that you speak of if I decide to keep this cart. I’ve noticed power loss lately and much more runout before the brake engages. The controller is unmodified.

smokey tennis shoe

Meangreen do you have a danaher controller now?