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I'm running 5S & a 1700Kv Nue in a RC8, Far from an extreem set up. No way my set-up killed 4 MMM bec's & not the other 2 (these 2 have the fan grills removed & the fan connector removed from the bottom board). Sure is a weird thing. 4 MMM's die in stock configuration but the 2 I broke the fan connectors off of and removed the fan grill from are working like a charm. I feel a large % of the problems are mechanical (not including the bad chip on V1's).
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I am excited to hear about V3.. My V2 died after 3 battery packs and my V1 died last night.. the fan had quite a while ago but I had put a fan on top of it I was running at my track when all of sudden it just quit...
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All of this is taking the fun out of the hobby for me. I just want to run my Savage.....is that too much to ask? :tongue: |
jay what's your email?
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It's all just speculation right now, but I can't see that just running the controller perfectly within spec is causing the issues. 6 months ago it would have been expensive to get this kind of reliable power (assuming the MMM will be reliable with V3), but technology just becomes cheaper. |
Now that I am remembering back to my run, It had done a single cartwheel before it stopped working. I have read about a couple peoples MMM that stopped working after a landing or being jolted somehow. Then it stopped and I reset it. Worked for 10 seconds then shut down. I got the same blinking lights then fading some people have posted. I dont think my setup of 4S and a 7XL had anything to do with it.
My only concern on the 6S setups is that some people are not taking into account the amperage spikes that could be occuring. On 6S and geared high there could be voltage spikes in the hundreds of amps. A lot of these people are running 5000mah cells in 3S config series for 6S total. I dont think most 5000mah cells are up to the task of providing the current needed. I not an expert on ripple currents or anything like that, but I am not sure how the speed controllers react to asking for 200 amps of spike, but only getting 100 in return from the battery. My 7XL setup geared for 39mph sees spikes of about 80A. For every mph over that I'm sure there is a huge increase with motor inrush currents and its not a linear factor. |
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I'd like my apology.. ;)
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I, Jason, apologize to E-mikey for calling him out, on what was said. I was wrong, he was right. Though you are still a MMM burning up n00b :intello: good ?
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it is indeed a mystery to what is really happening and cant wait for my v3 to arrive so i can get a full pack in :mdr: |
The 80A was a measured peak on my wattmeter. I run about 42A continous at top speed on 4S on a stock emaxx geared 20/68. If you are running 6S and you are geared for 38mph your amp peaks would be even less than mine. I think some of it might be people that are geared for 45mph on 4S and then decide to throw in some 6S lipos on the same gearing to see what happens. Again thats a small percentage. I think most failures have been BEC related if you look at the data on the failure posts. Something to think about is that most emaxxes have 2 servos. Maybe they are pulling to much current for the BEC?
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Hi all, do you think we can expect a reply by e mail from C/C or do they definitively stopped reply? :(
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Patrick will answer, you dont seem to have a question for him though
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I just wanted to place an order, I'm C/C reseller for France and it seems impossible to buy anything :no:. |
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Thanx! |
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