Look what i've found on MGM website!!!!!!!!

Somes guys here have got somes problems with the MGM Low Voltage Cutoof who kick in too early.
Please reed it and tell me if we can did the same to lower the LVC on the controller (16018 or others) to solve the problem with li-po pack

Reed it carfuly please

http://mgm-compro.com/pdf/en-a123sys...ollers-tmm.pdf

David

If i make their calcul, i suppose that if i set the MGM16018 LVC in Nixx and adjust it at 1.17, i'll have a LVC of 3.0v/cell for a 4s li-po pack.

Please if some body can try it, because here in Quebec, we have 4' of snow outdoor, and i can't try it.
So if somebody run a 4s setup on his MGM can programm his MGM controller and set the LVC in NiMh mode, and place a 1.17 value, and try it just to see if the LVC willl kick it on hard acceleration, and when the pack will be dump, check the cell voltage.

I'll give it a shot tonight or tomorrow. I've been running in race mode to prevent the early cutoff.

J.

OK good, and please don't forget to tell us the result

Do you always round up on #3? That would be the question I would have. Thier examples they are always greater than .50 in fact much higher. So, if you are at 10.20 do you still round up?

[BrianG]

Rounding is usually done by going to the next highest integer if the fractional part is greater than or equal to 0.5 - otherwise round down. If you want to play it safe, round down.

My calculation for 4s li-po si this one:

3.7v/cell X 4 cells = 14.8volts

14.8volts / 1.45 = 10.2 (i didn't round down, i just keep this number to be the most precise possible)

0.8 X 10.2 = 8.16V
1.16 X 10.2 = 11.83V

8.16V / 4cells = 2.02V
11.83V / 4cells = 2.96V

So if i want a cutoff voltage of 3V / cell, i just do this : 0.8 = 2.04V
? = 3.00V

? = 1.18V

So i set the MGM cutoff in Nixx mode and adjust it at 1.18V

If all is OK, the controller will suppose to cutoff at 3.0V/cell or 12V (1.18V X 10.2 = 12.036V) for the total pack.

I re-read the instruction of the owner manual of my 16018, and the MGM controller don't use the same method of others controller to ""watch'' the cell voltage.

Well, I would have tried it, but my mgm is gone. I had some wierdness from it a while back when it let out some smoke and quit working. I was about to send it off beginning of this week, when I thought I'd try it once more. I found out that it had just burnt out the BEC, and still worked with an RX pack. I was playing with the programming to try this just now, and when I turned it on, it let out a little more smoke. Now I think it's totally gone. I'll be sending it off hopefully to get repaired.

J.

Originally Posted by david lamontagn

Somes guys here have got somes problems with the MGM Low Voltage Cutoof who kick in too early.
Please reed it and tell me if we can did the same to lower the LVC on the controller (16018 or others) to solve the problem with li-po pack

Reed it carfuly please

http://mgm-compro.com/pdf/en-a123sys...ollers-tmm.pdf

David

I program my 22418 via my computer and I have no area to set the cutoff voltage when I select NiCd cells.

Anyone figured out how to do this?

Excuse to all guys here, i've recieve an email from MGM and it's just with the Airplane/helico controller that we can set the LVC on Ni-xx mode.

I asked the same to the MGM team and the answered:

In current Car/Boat versions are no possible set "cut-off voltage", here is fixed value ca 0.85V/cell (Nixx) --> it is ca 2.2V/cell A123.
Nixx batteries have only automatic number of cells setting (this value is no critical for Nixx) - this is applies for all controllers, no only for car/boat. When you will start with charging A123 cells, cut-off value for A123 will be correct.

I undestand that programming for nixx cells will work for a 2.2V cutoff using any number of A123 cells.