MMM auto lipo cutoff or 6.0 volts?
 

What do you all use? Does it make a difference?

I have two TrackPower 2s1p packs.

Thanks

I read about a lot of people using the auto-lipo but it says in the manual that it only auto detects between 2s and 3s. I'm not sure if it will work for 4s or more so I always set mine for 3.2v per cell just to be safe.

Yep, I always use the manual setting and go for at least 3.1v per cell. I have not noticed much difference with 3.2v per cell for runtime, so that is what I use.

I use 3.3 vpc

If you're using the Trakpowers in series, you'll want 12.0V for the LVC as a minimum. I use 12.6V on mine with 2 Trakpowers.

I have them in series, thank all!!

If castle is listening think there needs to be a programming option where you can set your own auto detect voltage. e.g 12.8 volts if a 4s pack is detected and 16 volts if a 5s pack is detected, otherwise it would be PITA to have to reset the cuttoff every time you alternate between packs.

If you set to auto detect it sets itself for 3.0v/cell. However it does work on up to 6s when you are using the Monster. If you set it to auto detect and then when you turn the controller on it will beep the same number of times as the cells it detected so you can verify it detected the correct number of cells. For instance if you plug a 5 cell pack it will beep 5 times. For a 3 cell pack it would beep 3 times, etc...

That said. I use a 3.2V/cell manual setting. No need to get every last drop out of the lipo and reduce the life of the pack.

+1!!! That would be very ccool if you could just set the volt/cell on the cut off and let the autodetect do its thing.

OK, That makes sense. Thanks for the info!

Too bad the manual setting only goes up to 17.1v - no good for a 6s pack. You have to select auto if you run 6s. I would love to see that change.

That problem is fixed on the new versions of the Castle Link. Just update to the new version (3.051).

Sweet - thanks for the heads up!! "Ask and ye shall receive" :lol:

No problem, as much as people have helped me on this board, it's the least I could do.

+2 on that. If this is all done through code a firmware update could be all that's needed to make that adjustable setting. That's been a real issue for me because I do like to run different packs while I am out and have to stick with the auto-cutoff as my only choice.

I don't get it . . . changing the voltage drastically changes all the characteristics of the system. I think most people set up a system with an end use in mind and stick with it. Why are you changing the voltage for your systems?

Generally I agree, but I can think of two scenarios:

1) HV - the more cells you use, the less of a difference a change makes. If you are using 2 cells, then yes going to 3 is 50% more speed. But if you are using 5 then going to 6 is only a 20% change. I have a setup that is going to be a nice powerful ride on 6S geared for ~42-44, but will want to drop down to 5S for some calmer driving around.

2) Doesn't apply to me, but if you have an ESC you want to switch between rc's with different setup it would make things a little easier than having to reprogram every time.

I see. I guess I've always been trying to nail my setup for a very specific use and only that use so I've never looked at it that way. Interesting.

When I started building my current system I knew I wanted 6s HV, low amps and it's working awesome. This weekend I was getting 25 minutes of runtime at the track going full out in my XT8. Motor temp never broke 100.

I use 4s for conservative (and for ferrying vehicle), 5s for "oh yeah" and 6s for "holy *%$@":lol:. Because of this I have it set to auto lipo (or would have to carry a laptop) but I never run the battery down. I stop as soon as I detect slowing down.

ps, imo why pigeon hole your monster anyway. Beat it anyway you can damn it!!:tongue:

I think there is a problem for auto detect of many cells. Think about it, if you have a 5s fully charged (~21V) or a 6s slightly discharged (~21V). How would it know the difference?

It doesn't - There has always been this issue - you have to be careful with empty packs...

That is why they have the tones for the cell count

Yeah I know, I read someone say that autodetect only works for 2s and 3s and someone wrote they should put it in for all cell counts, and a bunch of people all agreed, I was just explaining why it might not be suitable for higher cell counts...

I have never trusted the auto lipo setting, always using my own voltage amount for the LVC

To state the obvious, if you're running auto detect then you should always run fully charged packs. As an example fully charged 6s is around 25v and fully charged 5s is around 21v. That's a significant difference and circuit should have no issue auto detecting imo.

Someone on the traxxas forums noticed that the mmm beeps for the number of lipo cells detected. I tested with 5s and 6s and it did beep 5 & 6 times respectively. A good way to verify that packs are detected correctly. It does say this in the manual too btw.