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Old 06-27-2016, 01:54 AM   #995
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Quote:
Originally Posted by MGPAX View Post
What I'm looking into and wondering about is how you all are making this work.

The Phantom is a 3.5-4 thousand watt motor at 24volts which is over 150 Amp draw.

If your batteries are only capable of 600 watts, that's 50 amps or 20 AH (20 amps output for an hour).

I fly electric jets at 4K watts and I do it with 50 volts and batteries that can put out 140 amps, but only need to put out 90. (at full throttle)

I just don't see how you guys are not destroying those batteries and underpowering that motor on the Phantom to death?!
Trick is, the Phantom is only aggressively spooling the motor when max power (and thus max boost) is needed. The rest of the secrets are all Robs.
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Old 06-27-2016, 02:42 AM   #996
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Some batteries can't handle it. Rob tried quite a few before settling on the Big Crank's. I went with 4 audio batteries to get lower resistance. This gives a quicker dump and a quicker recharge rate. One of these days I'll find someplace to just put the pedal to the floor, and hold it down, to see how low these batteries go. The lowest I've seen so far is 23V, and they bounced back to 28V in a minute.
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Old 06-27-2016, 05:14 PM   #997
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The reason the voltage is dropping so fast and then climbing back up again is because the batteries are being over taxed. You're not draining the batteries down and recharging them, you're drawing them down and then they are recovering.
Normal battery recharge takes time...it doesn't happen in minutes...These are not Lithium Polymer batteries..and they take at least an hour to fully charge.
The same way as if your car doesn't start and you keep the starter turning for 8-10 seconds. Only this is doing that on a regular basis.
Which (I've always understood) is murder on the batteries...
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Old 06-28-2016, 07:28 AM   #998
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My batteries lasted for about two years. And they're the cheapo Power Sonics. So much for "murdering" them.
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Old 06-28-2016, 07:45 AM   #999
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Oh
And by the way, my STARTER battery died first. Long before the dump batteries.
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Old 06-28-2016, 01:08 PM   #1000
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Actually, those aren't the batteries used by everyone else

Quote:
Originally Posted by MGPAX View Post
What I'm looking into and wondering about is how you all are making this work.

The Phantom is a 3.5-4 thousand watt motor at 24volts which is over 150 Amp draw.

If your batteries are only capable of 600 watts, that's 50 amps or 20 AH (20 amps output for an hour).

I fly electric jets at 4K watts and I do it with 50 volts and batteries that can put out 140 amps, but only need to put out 90. (at full throttle)

I just don't see how you guys are not destroying those batteries and underpowering that motor on the Phantom to death?!
The Big Cranks are what is recommended to power the ESC. They rate at 26 AH and 400 CCA apiece. That's 800 CCA and 52 AH total, once they are conditioned and working properly. Because they are still a higher resistance, though sealed battery, they take some time to draw down, and even longer to recharge. The audio batteries I chose won't supply power for nearly as long, but they will supply more of it, quicker, and recharge much quicker. I have a combined 80 AH and 3400 Cranking Amps. Due to their low internal resistance, they wouldn't pass a CCA test, in fact they are designed to fail such a test. No doubt the batteries used in your electric jets are also measured in cranking amps rather than CCA, due to their low internal resistance.
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Old 06-28-2016, 01:10 PM   #1001
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The Big Cranks are what is recommended to power the ESC. They rate at 26 AH and 400 CCA apiece. That's 800 CCA and 52 AH total, once they are conditioned and working properly. Because they are still a higher resistance, though sealed battery, they take some time to draw down, and even longer to recharge. The audio batteries I chose won't supply power for nearly as long, but they will supply more of it, quicker, and recharge much quicker. I have a combined 80 AH and 3400 Cranking Amps. Due to their low internal resistance, they wouldn't pass a CCA test, in fact they are designed to fail such a test. No doubt the batteries used in your electric jets are also measured in cranking amps rather than CCA, due to their low internal resistance.


Hey kool! The odyssey batteries pc-680s are the new recommended dump batteries.




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Old 06-28-2016, 04:11 PM   #1002
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Hey kool! The odyssey batteries pc-680s are the new recommended dump batteries.




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You've got to be kidding me. They are weaker in every way. 16 AH and only 170 CCA. How could these possibly be better?
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Old 06-28-2016, 04:12 PM   #1003
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You've got to be kidding me. They are weaker in every way. 16 AH and only 170 CCA. How could these possibly be better?


Less chances of shorting I'm assuming. But per Rob these are the recommended batteries now.


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Old 06-28-2016, 06:39 PM   #1004
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Less chances of shorting I'm assuming. But per Rob these are the recommended batteries now.


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Did I miss something? When did he (Rob) say that?
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Old 06-29-2016, 02:16 AM   #1005
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Did I miss something? When did he (Rob) say that?


A few people are running it this way, and the new kits will be recommending it.

The Odyssey batteries are safer to put into series then the big cranks.


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Old 06-29-2016, 10:57 AM   #1006
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A few people are running it this way, and the new kits will be recommending it.

The Odyssey batteries are safer to put into series then the big cranks.


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Hmm ok. On paper in seems like a downgrade. Anybody butt dyno yet?
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Old 06-29-2016, 11:31 AM   #1007
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Hmm ok. On paper in seems like a downgrade. Anybody butt dyno yet?


No butt dyno yet. Hopefully soon.


What's interesting though is that it takes longer to charge up then the big cranks so they hold their charge better.

Also supposedly the Odyssey is capable of supplying a higher cranking amp for a short burst (5 seconds) which may also be why Rob chose them.



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Old 06-29-2016, 02:40 PM   #1008
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As I said in my original post. I am trying to figure out how it is that the batteries are lasting any time at all.
Not that you guys are doing something wrong....just that my experience tells me that the batteries should not last long at all.....
so much for my experience huh?
Pax


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Oh
And by the way, my STARTER battery died first. Long before the dump batteries.
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