RC-Monster Forums - View Single Post - Home-brew battery measuring station

BrianG · 06.09.2009, 06:21 PM

I agree. The only valid data would come from perfectly repeatable and consistent test setup.

I've thought about this for a while and don't think a dyno would be sufficient. We know that the temperature of the motor affects efficiency, and the motor temp would certainly change in a dyno, which would affect the results. I think the load would have to be something static and relatively temperature-independent. Which means we are back again to the resistor concept.

And since I was at work, I forgot to bid on those 3ohm 50w resistors (240 count) that I was watching. Ended for ~$50 + shipping. Poo. That's a whole heck of a lot cheaper than retail!!! Hopefully I'm on the ball a little better for the next one.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	06.09.2009, 06:21 PM I agree. The only valid data would come from perfectly repeatable and consistent test setup. I've thought about this for a while and don't think a dyno would be sufficient. We know that the temperature of the motor affects efficiency, and the motor temp would certainly change in a dyno, which would affect the results. I think the load would have to be something static and relatively temperature-independent. Which means we are back again to the resistor concept. And since I was at work, I forgot to bid on those 3ohm 50w resistors (240 count) that I was watching. Ended for ~$50 + shipping. Poo. That's a whole heck of a lot cheaper than retail!!! Hopefully I'm on the ball a little better for the next one.