Quote:
Originally Posted by Tenthousanddays
So I was thinking about this some more, because I'd really like to get more towards 7 or so PSI, which would be the defining factor in building a system myself rather than using the Phantom... In order to achieve 7kw of power on that motor, you need around 300amps. If you use a big enough battery... say two or three of these Odyssey PC925's, you should have plenty of amperage to power the motor at full blast for a couple minutes?
http://www.atbatt.com/odyssey-pc925t...ry.asp#related
Its 27Ah, with a 900A Hot crank surge... So even if you run the motor at full blast for 1/16th of an hour (3.75 min), you should be able to push out way over 300A (432A). Realistically speaking you probably wont be able to sustain 432A for 3.75 minutes - but pushing the motor at full blast for a minute or two doesn't seem out of the question...
Is this feasible? |
Math seems right but I still doubt the Odyssey can supply that kind of amperage. Specially if we are going to pay that kind of $$ for the batteries, might as well get Li-Iron-Phosphate. Those can give a lot higher current than AGM, long life , way more compact, can discharge 80% w/o damage, will hold higher voltage even when discharged over 50%, a lot less internal resistance ... seems like they are custom made for this setup ..
http://shoraipower.com/battery-specifications
The gains demonstrated by the Phantom setup are more than enough for me to pull the gun on ESC. But once I see the that there are so many apparent and glowing places where enhancements could have been made, I feel like a much better job can be done with a little effort. I would be happy to get similar psi numbers to Phantom .. may be a little more up-to ... 3~4 psi ... but it will be tough.