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Old Sep 22, 2010, 07:33 AM
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1515 1y + 180A Seaking + 2S 5000mah 20C = Puff??

Hey guys,

Picked up a few goodies for my 32" Vegas Hydro...will my Turnigy 2S 5000 20C hardcase lipos survive a 1515 1Y/180A Seaking combo?

Or should I be looking for other lipos with a higher C rating?
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Old Sep 22, 2010, 07:47 AM
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The 1y has a peak surge draw of 110 amps, so unless you over prop it you should be fine. It will be right on the edge though, so you'll want to monitor battery and motor temps just to be sure.
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Old Sep 22, 2010, 07:47 AM
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5000 x 20C = 100A. Not enough... even if the Neu will draw much less, the burst can go up. Go for 35 or 40C, or whatever takes you above 180A.

3 seconds late.... wparsons beat me to it...
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Old Sep 22, 2010, 08:01 AM
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I'd go 30c minimum...............they will bloat a bit due to high heat.
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Old Sep 22, 2010, 10:48 AM
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Keep in mind that a 20c battery will have 30c burst capability (150a), which is higher than the burst current on the motor (if propped correctly).

I bet the nominal current draw on that motor with a good matching prop is ~80a, well enough below the batteries happy zone to be safe.

If you over prop it, both the motor and battery will get HOT though.
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Old Sep 22, 2010, 11:06 AM
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Hi Sync,

You can give it a try, but I'm bloating 20C 5000mAh Lipo's in my Arowana, which has a motor that according to the specs will draw 47A max.

Granted, that's a monohull versus a hydro, but my motor peak current is half that of your Neu...

I wouldn't risk it.

Regards, Jan.
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Old Sep 22, 2010, 11:08 AM
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yeah...I'm thinking that I don't really want to take the chance. I'll just sell my current 20C 5000mahs and use that towards some 40C 5000mahs for future use. The price difference between 30C and 40C is only 2-3 bucks.

Thanks for the input guys!
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Old Sep 22, 2010, 12:50 PM
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pompebled, have you monitored what your actual current draw is? If the motor is over propped, it could easily draw WAY more current than the specs say.
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Old Sep 22, 2010, 01:27 PM
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Hi WP,

The motor isn't overpropped, it revs out nicely and with a 45K I can run for just over 6 minutes full throttle (the length of one heat).

The motor is warm (shaft a bit hotter) and the Lipo is handwarm after a run.

I'm going for higher C rating for next season, as the 47A continuously in addition to the peaks getting out of the hole and accelerating from the marker will give me an average of 50-60A (guestimate) which is a bit too much for cold 20C lipo's.

I'm working on a way to heat them during charging, but that proves to be a bit tricky at the ponds where we charge off traction batteries.

Regards, Jan.
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Old Sep 22, 2010, 04:02 PM
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If you can run for 6 minutes on a 5000mah pack, and aren't totally draining it, then you're averaging under 50 amps. If a 20c 5000mah pack can't deliver 50amps continuous, then I'd call it a faulty pack.
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Old Sep 22, 2010, 09:28 PM
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Im currently running a BJ26 1500KV motor with a 90A Seaking with a x642 and my 2 x 2S 5000mah 20C in a Vegas 32" hull...and the batteries were 75F...but I'm pretty sure that's because the BJ26 motor barely pulls 40A....if that. I'm sure that the Neu 1515 1Y will pull more....

Since winter is coming I've decided to just run the 5000mah 20C with the 1515 1Y and just prop moderately with a CF prop. I'll go with 40C lipos next year
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Old Sep 25, 2010, 08:44 AM
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Any motor can pull alot more than what the specs say. Don't trust those numbers as they are not real. That BJ motor can pull over a 100 amps. Eagle tree them and see.
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Old Sep 25, 2010, 12:10 PM
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^^ Oh definitely... but they usually aren't happy pulling amps well above their specs, in that case I would consider it over propped.
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