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07.28.2009, 11:49 PM
Always before and even more in this struggling economy, Price is the #1 selling point of almost any product.
This whole C rating discussion. Continuous C ratings versus Surge Watt Ratings. (or whatever you want to call it)
Much like FET ratings, there is an acceptable amp draw that a pack can sustain throughout the life of it's charge. This is especially useful and required for the fly boys.
Continuous "C" rating is a level of amp draw that the pack can hold a certain voltage at for most of its discharge capacity without damaging or substantially shorting it's cycle life. It is a level of amp draw the does not damage it.
We can talk about how there is no standard if we want to, but it is the rating system that has always been used. Accurate or not, given by the manufacturer or given by the retailer.
We can also argue about how it's not standardized. Weither or not discharging equipment is calibrated the same or variables in the tests were not equal.
How a pack performs all goes back to how it stands up under varying loads and is PROVEN on an accurate discharge graph along with pack temperature readings.
An ESC that is rated for 200 amps continuous can handle 1000 surge amps for 1/2 a second. But they don't rate them for surge. They are rated for continuous duty.
A motors wattage rating is based on how many amps on a given voltage it can sustain without failing. It's efficiency and alot of other things affects the final rating. Even then, the actual application changes the entire scenario. We could talk about airflow, the applications ability to shed the motors heat, or we could talk about the load that's on the motor.
The load that is on the motor will be the most influencial thing about that motors rating. Is it a stable and consistant load? If it varies, then how much? How much starting torque is required? Does it soft start? Or is it required to start under full load and instantly go to 100% as fast as it can?
Sooo many variables in the motor rating scenario. How can we come up with an accurate way to rate batteries using such a wide array of applications and motor types? I don't think that's possible really.
This accuracy would depend on that accuracy........blah... blah. But in the end, if things aren't right, there's at least one more person to point the finger at. It's whoever rated that motor wrong, isn't it?
Lipo technology is still young. It's still developing. In the Marketing world, there's still a race going on.
It's not about marketing or awards. It's about performance and longevity.
In the end, it's not just about who can put the highest number on a pack or a cell. For those of us who are educated and do our research, it's always going to come back to an accurate Discharge Graph.
Instead of pointing fingers and making claims of having the VERY Best Product, why don't we work together to aggree on a rating standard?
But that's a secret isn't it? It would place imbalance in the market as it is now. If everyone is open and honest about their packs and how they perform, then the race would change into a price war. Oh we can't have that, now can we?
As far as "buy American" or "This costs more because we employ Americans", let's hope we all do.
The fact of this is though, All Lipo cells are made overseas. Aren't they?
They are ALL imported. Mostly because of the laws we have passed through the EPA, and how we have a tendency to regulate everything, Especially Chemicals.
In the Engineering World, China is kicking our butts, along with alot of other countries.
So how about it? Can we see some discharge graphs?
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