Zippy-H EagleTree data

[kulangflow]

I currently have my E-Revo set up for speed runs (Phaltlines, 24/54 gearing, suspension-limiting zip-tie, etc). I read somewhere recently that the Zippy packs might not stand up to the demands of ridiculous gearing on such a heavy vehicle, so I figured I'd throw caution to the wind and find out how they'd do.

My new Zippy-H 3s 5000mAh 20C packs arrived today, so I charged them up, threw them in, and beat them savagely for just under 15 minutes.

They seem to have done okay from what I could tell from their maiden voyage. I did several 60mph passes up and down my street and brought it in.

Here are the stats according to my Garmin GPS and Eagle Tree:

MMM fan was on, but temp unknown
1515 1y = 127.2F
Max Speed = 63.7mph (never really opened it up all the way because my street is too short for it)
Max Watts = 3465
Max Amperage = 182.45A
Lowest Pack V = 18.43V (3.07v/cell)



There were a couple of rest periods in there while waiting for the street to clear and answering neighbors questions about the speeding bullet whizzing by their houses.

What are your thoughts? Do you think they handled it alright?

[lincpimp]

Not a bad idea to take it easy on the packs for the first few cycles... Do not discharge them fully, and do not charge them over 1c... I will find BVM jets break in specs and post them up...

As far as performace, they did drop to almost 3v per cell, but I am guessing that is at the 182amp spike. So at 35c spike they did not crap out. I doubt that they will last 200+ cycles with this beating. Time to go to 5s-6s and lower gearing.

[kulangflow]

For sure. I totally agree.

Typically I would never thrash my lipos, esc, or motor like this. Even when doing speed runs, I apply gradual throttle over long distance and only do a few passes. This was more of an experiment than anything else, a one time thing. My usual gearing is 22/68 on 4s and 5s.

The packs held up pretty well though, I think. For the record, the 18.43V was actually at that last 132A spike right near the end of the run. It was 19.88V (3.31v/cell) at the 182A spike toward the beginning.

[othello]

Arghhh. 3465 Watts and 182A peak. Crazy numbers. Did you use the 150A Micropower unit? I guess there were even higher Amp peaks which surpassed the eagletree loggers abilities.

Between 500-550 seconds you had an amp peak of 174A with voltage only falling to 20,7V (3.45V per cell). Not bad i would say. But it's hard to tell when you post the graph of the whole run. Can you single out two or three consecutive speed passes and post a new graph? This would give a better view on how your pack held voltage under load.

For those speed levels a big wide open space would be great. I'm always curious where Amps/Watts level out when the motor "only" has to maintain top speed. AMP/Watt progression while accelerating is also interesting as it shows when and where tires lost grip.

Did you use a center diff? Which tires were mounted? And what is your revo weighing? I just want to put your graph into perspective ;-)

[BL-Power]

He did use HPI

Phaltlines

[othello]

Thanks. Overlooked this part.

[kulangflow]

I did use the 150A unit. I've attached the raw .FDR file, so you're welcome to peruse it and play with it for whatever data you'd like to see.

I have a place nearby with a long, wide, flat street where I normally do speed runs. I'll take this set-up out there and throw the ETree on there for a few speed passes and report back.

Here is another version of my first graph. I just filtered Amps values above 100A in Excel.