Are Zippy Lipos safe with a Castle MMM Speedy?

[squeeforever]

Originally Posted by sikeston34m

The poster on the rctech thread sounds very bogus to me. It's more of a "Nitro guy converted to Brushless - going back to Nitro" thing to me.

A Bad cell in ANYTHING doesn't surge, it dies a slow death.

If a Lipo can't keep up because of it's "C" rating, it overheats and puffs.

Thats what makes sense and what I thought/think, but the Tekin prez said himself in that thread that they do infact surge?

[sikeston34m]

Originally Posted by squeeforever

Thats what makes sense and what I thought/think, but the Tekin prez said himself in that thread that they do infact surge?

Ok, I went back and read what you are referring to that Mr. Tekin Prez said.

They are talking about braking emf forces exceeding the voltage limitations of the caps and fets.

"If a battery is over rated or over stressed the voltage will bounce to very high levels and stress the caps. If the caps blow the voltage spikes can exceed the limits of the fets and the speedo will blow. Many of you are looking at things with data loggers that take 20 samples per second or less. We are talking about voltage ripple that happens in micro seconds that can bounce off the scope thousands of times per second with no caps. The fets are only rated to 30V."

Most Manufacturers allow enough overhead in their fet ratings and in their cap ratings to help compensate for this. They also don't over-rate the ESC, such as amp carrying ability, voltage range, etc. They also use forms of secondary protection in their braking circuitry. Couple this together with some great operating software, and you have a great package.

I've heard alot of really good things about Zippy Lipos and would not hesitate to use them. In fact, I've been thinking about ordering some soon.

[squeeforever]

Originally Posted by sikeston34m

Ok, I went back and read what you are referring to that Mr. Tekin Prez said.

They are talking about braking emf forces exceeding the voltage limitations of the caps and fets.

"If a battery is over rated or over stressed the voltage will bounce to very high levels and stress the caps. If the caps blow the voltage spikes can exceed the limits of the fets and the speedo will blow. Many of you are looking at things with data loggers that take 20 samples per second or less. We are talking about voltage ripple that happens in micro seconds that can bounce off the scope thousands of times per second with no caps. The fets are only rated to 30V."

Most Manufacturers allow enough overhead in their fet ratings and in their cap ratings to help compensate for this. They also don't over-rate the ESC, such as amp carrying ability, voltage range, etc. They also use forms of secondary protection in their braking circuitry. Couple this together with some great operating software, and you have a great package.

I've heard alot of really good things about Zippy Lipos and would not hesitate to use them. In fact, I've been thinking about ordering some soon.

Now see, that makes sense. He never said anything about the regenerative braking (I'm assuming thats the cause?) causing the voltage spikes