Is there a way improve the LVC shutdown

[bdebde]

Perhaps a delayed LVC is not a good idea. If it allows the batteries to drop below 3v a cell, even for a split second, it may be enough to do damage to the batteries (or at least shorten their life considerably).

[BrianG]

Originally Posted by bdebde

Perhaps a delayed LVC is not a good idea. If it allows the batteries to drop below 3v a cell, even for a split second, it may be enough to do damage to the batteries (or at least shorten their life considerably).

Actually, if using this type of outboard circuit, the diode would increase the LVC threshold by 0.7v for silicon diodes, or 0.3v for germanium diodes. So, assuming a normal 0.7v diode, if the LVC is set for 3v/cell, it would actually activate at 12.7v for a 4s pack (3.175v/cell), 9.7v for a 3s pack (3.233v/cell), etc.

Even so, this would just prevent the LVC from reacting too quickly. Bursts usually last a couple mS, so all you need to do is average the voltage out so it doesn't dip at the LVC at quite the same speed as at the ESC. Basically, make it have around a 1/5 to 1/4 second delay.

Is it perfect? No. Then again, it is a simple and cheap alternative.

[jhautz]

Originally Posted by bdebde

Perhaps a delayed LVC is not a good idea. If it allows the batteries to drop below 3v a cell, even for a split second, it may be enough to do damage to the batteries (or at least shorten their life considerably).

I'm with you on this one. If the battery is dipping below the 3V/cell mark then the battery isnt up to the task and you will be damaging it if you run it this way. Gear down to reduce the load to a level that the battery is capable of supporting or get a better battery.

I say this with the exception of the MGM controllers which just flat out have much to sensative of a LVC.

[lincpimp]

I would say that the best cure would be a pair of trakpower lipos. They cured my issues with poor performance on a high draw system. Gearing down slightly may help too.