Thread: MMM v3?
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hemiblas
RC-Monster Carbon Fiber
 
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Join Date: Oct 2007
09.30.2008, 06:52 PM

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.

Last edited by hemiblas; 09.30.2008 at 06:59 PM.
   
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