Quote:
Originally Posted by BrianG
According to Castle's "Special Projects" page, the MMM is rated for 120A continuous. Now, at first glance, the 160A Losi ESC might seem a better choice, but many ESCs are rated "optimistically". Many I've seen simply add up the current rating of the FETs, and at 25*C. Now, I don't know about you, but even properly cooled setups will NEVER run at 25*C unless in the dead of winter. And FET current rating goes down with temperature, sometimes quite a bit. I haven't spec'd out the MMM, but their HV110 (airplane ESC) is rated at ~200*F - much more realistic. I would imagine they rate all their products in the same realistic way. So, if the Losi ESC is rated 160A @ 25*C, it would be closer to 90-100A at normal running temperatures.
That aside, virtually no setup I have ever seen uses 160A continuous. If it did, even a 10Ah battery would only last 3.75 minutes. Most MT/truggies geared for track use (~35mph) tend to run in the 15-20A average current rating, with peaks up to 7X that (~150A). So as long as the ESC you are looking at can handle the continous and burst value, you're fine.
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seriously BrianG youve made a very good explanation again
thanks