Castle Creations Pheonix Ice 100

[Unsullied_Spy]

Ripple happens when you are pulling more amps than your batteries can provide to the capacitors. Each time one of the phases on the motor fires it needs amps to provide the torque to keep you moving, this happens thousands of times per second which equates to thousands of amp spikes. Lipos cannot handle this kind of draw, so ESCs have capacitors to smooth out the current draw but when you are pulling so many amps that the batteries cannot keep up the caps run empty (but are still trying to provide the amps, which causes them to get very hot and will eventually cook the electrolytic fluid right out of them) and suddenly the lipos have to deal with those amp spikes. Very very bad for ESCs and batteries.

BakedMopar: Your graphs are a bit congested. Could I see the first 2 with just Voltage, Amperage, and Ripple? If you could cut the time period to be only when you're on the throttle the graph will spread out a bit and I can read it better.

[BakedMopar]

Thanks. I will re post them when I get home later.

[BakedMopar]

Okay I fixed all the log files. Let me know if you see anything.

Here is the run with the 6s1p.

http://www.vimeo.com/8009081

[tth]

Man I cant wait to see the Marine Controllers. I noticed they have a 200A Ice Controller scheduled for release for January 2010!

[6S HYDRO]

6s on a 12l holy cow, ive ran 5s on a supervee w/ a 12l and as stock esc with no problems at all and have gps'd at 51.9 mph-but those were saw passes and i'd never try 6s on that motor

[Unsullied_Spy]

Thanks for the new graphs, they're SO much easier to read. My other explanation was for Ripple Current, not voltage. The only Ripple Voltage I know of is for using an AC power supply on a DC device, that obviously doesn't apply here. From the looks of it, when the amperage drops the cell voltage spikes to recovery and that's where you get the ripple from. I'm not sure how much is normal and what the acceptable range is, but you could add capacitors to the input wires (as close to the ESC as possible) to help cope with ripple current and it may help with the voltage, I'm not sure.

Cutting out at WOT could be a software issue, it doesn't look like you're getting too close to 3.0v/cell.

[BakedMopar]

Funny you say that because most say it hitting the cut off including castle. I was thinking filmware also but I will try a couple of stuff tommorow. I will report my findings.

BTW if you watch the video posted it shows how it cuts out. At 0:45 seconds in it cuts out.

[Unsullied_Spy]

It very well could be the LVC but it could also be the ESC having a hiccup. Do you have a smaller prop to try? If you put less load on the lipos the voltage will drop less under load and you shouldn't be stalling out at full throttle.

[BakedMopar]

No that's the smallest prop I have. I used this motor and batteries with my stock SV27 ESC with a m445 prop without a problem. All was changed was the speed control. I will try it today again with the cutoff set at hard and see if that's really what's causing the surge. I will post my finding later on tonight.

[sailr]

If it doesn't cut out with a smaller prop, then we pretty much know it is an LVC issue.

It very well could be the LVC but it could also be the ESC having a hiccup. Do you have a smaller prop to try? If you put less load on the lipos the voltage will drop less under load and you shouldn't be stalling out at full throttle.

[sailr]

Where are the new graphs? I don't see them posted. I would like to have a look at them also.

Thanks for the new graphs, they're SO much easier to read. My other explanation was for Ripple Current, not voltage. The only Ripple Voltage I know of is for using an AC power supply on a DC device, that obviously doesn't apply here. From the looks of it, when the amperage drops the cell voltage spikes to recovery and that's where you get the ripple from. I'm not sure how much is normal and what the acceptable range is, but you could add capacitors to the input wires (as close to the ESC as possible) to help cope with ripple current and it may help with the voltage, I'm not sure.

Cutting out at WOT could be a software issue, it doesn't look like you're getting too close to 3.0v/cell.

[Unsullied_Spy]

No that's the smallest prop I have. I used this motor and batteries with my stock SV27 ESC with a m445 prop without a problem. All was changed was the speed control. I will try it today again with the cutoff set at hard and see if that's really what's causing the surge. I will post my finding later on tonight.

Hmm. Was it cutting out on 4s? Going up to 6s will increase your amp draw and would then be almost certainly an LVC issue. Everything sounds like the LVC is kicking in, but I want to eliminate the possibility that it isn't something else. If you try other batteries, props, etc. you can get a better feeling for if it's cutting out or not. I don't see how you could suck 30C 5k lipos down to the LVC in 45 seconds if they were fully charged unless they are poor quality. Turning up the LVC is another good test to do, if the problem gets worse than your batteries can't hack it.

If it doesn't cut out with a smaller prop, then we pretty much know it is an LVC issue.

Indeed, IDK what the difference between the m440 and x437 is but if the 440 is a less aggressive prop give it a shot and see if the problem persists. Also give 4s a shot, that should lower your amp draw a bit.

Where are the new graphs? I don't see them posted. I would like to have a look at them also.

Check his original posts, he updated the attachments with the new graphs.

[BakedMopar]

Actually the 6s runs were only because they are a higher c rating and newer packs. This boat is normally ran on 4s. All runs with this controller was done on an x637. I found a k40 that I will give a try also. I can't see why this controller at 100a rating cannot keep up the demand that a 45a controller could. I also don't see all 4 set of batteries could crap at the same time. I am not giving up though as I WILL figure it out.

Thanks for all the help

[Steven Vaccaro]

Just a wild guess, but are you using a pistix? If so did you try it without it? This hasn't been an issue I've heard about in the past, but I'm just tossing it out there to eliminate one area.

[Unsullied_Spy]

What LVC did you use on the stock ESC? Stock ESC has no LVC, that alone could be the difference.