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Old 05-26-2005, 06:15 PM   #1
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MaxCim users...??

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I aquired a MaxCim N32-13Y Motor along with the 35C-25NB Controller.

There does not appear to be a setting for low voltage cutoff. The MaxCim people confirmed this.

Ok I am new to this, and Lipos are my expensive choice, how do you handle the cutoff issue, to ensure you do not damage the batteries??

Or am I in someway overreacting due to my novice to electric status??

Just tell me how, Thanks.

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Old 05-26-2005, 07:36 PM   #2
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I think you can get Low Voltage warning devices. However, what I would do is calculate a safe flying time. Here's an example.

I have no Low Voltage Cutoff (LVC) in the helis. Instead, I get to know my "fuel consumption". For example, I recently flew a heli 13 minutes and there was about 1500mAh useable capacity left. Knowing the capacity of the pack is about 6000mAh the heli consumed about 4500mAh during the flight. If it consumed 4500mAh in 13 minutes, it would consume all 6000mAh in (6000/4500)*13 = 17 minutes.

Actually, the discharger was set to terminate well above 3.0V/Cell to provide some safety factor. Subtracting a few minutes from the above total will provide a safe flying time limit that will allow for stopping at the end of the CC portion of the charge at the field and more aggressive flying.

With NiCds, full discharge/charge cycles works the best. Conversely, shallow charge/discharge cycles are a good thing with LiPos. If you fly only half the capacity of the pack and put it on charge, that's just fine!

(Note that it would be better in most cases to determine the capacity used by charging the pack and noting the capacity put back in. This was one of the early breakin cycles on this particular pack.)

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Old 05-26-2005, 08:10 PM   #3
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Thanks Rob...

I just assumed that all ESC's had voltage cutoffs.... I will follow your advice.

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Old 05-27-2005, 09:46 PM   #4
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Here is a response I received to this question;
Hi Rod,
I have no direct experience but I know that some of our customers are using the FMA device. It works and makes sense.

Depending on the brand of cell, there is some evidence that 3.0v can be too high, but is a safe value as you said, no load.
Just be aware of the voltage drop in the pack under load and don't set the cutoff so high that you have no flight time. Some have done that and are now complaining.

( Tom Cimato).

Rod McRae wrote:
Tom, have you had any experience with either the FMA or Diversity low voltage cut-offs with your MaxCim controllers. I am going to convert to Li-Poly batteries and I like the protection that one of these devices provides. The only other method seems to be time your flying time so as to avoid pulling the Li-Poly cells down below 3.o volts, (no load).
Rod McRae
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