Lipo's in series ????
12-20-2004, 10:59 AM
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Lipo's in series ????
I have a E-Flite 400 brushless and I was wondering if I can use 2 - 7.4 v lipo's in series ?
Will the motor take the 14.8 volts ??
And also what are the voltage ratings for the brushless motors ??
Is there a voltage regulator built into the Phoenix25 for the motor side of the controller?
Thanks !
Will the motor take the 14.8 volts ??
And also what are the voltage ratings for the brushless motors ??
Is there a voltage regulator built into the Phoenix25 for the motor side of the controller?
Thanks !
12-25-2004, 05:16 PM
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RE: Lipo's in series ????
Lack of patience?
Your motor would probably handle the voltage, but you are on the edge I think... Did not find to many datas on it.
Usually engines in this class works best on 2-3 cells of LiPo, but the MAIN parameter to be aware of is the CURRENT! Higher voltage means that you have to reduce the load (propeller-size). If you can`t measure the current there is a big chance your engine just catch fire [&:]
The ideal voltage depends on your engines wiring, few windings means handling more current and smaller props, more windings means less current and usually props at small pitch and big diameter.... and so on.
On the motor-side of your CC-25 there are "chopped" pulses, not ordinary voltage-regulation.
Your motor would probably handle the voltage, but you are on the edge I think... Did not find to many datas on it.
Usually engines in this class works best on 2-3 cells of LiPo, but the MAIN parameter to be aware of is the CURRENT! Higher voltage means that you have to reduce the load (propeller-size). If you can`t measure the current there is a big chance your engine just catch fire [&:]
The ideal voltage depends on your engines wiring, few windings means handling more current and smaller props, more windings means less current and usually props at small pitch and big diameter.... and so on.
On the motor-side of your CC-25 there are "chopped" pulses, not ordinary voltage-regulation.
12-28-2004, 09:14 AM
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RE: Lipo's in series ????
Thanks, jooNorway !
I will not try using them in series, I ended up taking apart one of the 7.4 v packs and made an 11.1 volt pack instead, all 1500 mAh.
I will not try using them in series, I ended up taking apart one of the 7.4 v packs and made an 11.1 volt pack instead, all 1500 mAh.
12-28-2004, 04:48 PM
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RE: Lipo's in series ????
You can find out the voltage rating of any motor by looking up its specifications. I know for a fact that Horizon provides extensive specifications for their motors on their website. They're in a PDF you download from any of the motor description pages.
The E-Flite motors are generally rated to 8 or 10 cells, which is 9.6 or 12 Volts, nominally.
As I've explained many times, regulating the voltage going to the motor wastes power that one cannot afford to waste, adds unnecessary points of failure to the system, and increases the weight of the airplane, so it is NEVER done. Why would you carry around four cells if all you're going to do is burn off the entire output of one cell as heat? Why not just carry three, save the weight, cost, complexity, and power?
The E-Flite motors are generally rated to 8 or 10 cells, which is 9.6 or 12 Volts, nominally.
As I've explained many times, regulating the voltage going to the motor wastes power that one cannot afford to waste, adds unnecessary points of failure to the system, and increases the weight of the airplane, so it is NEVER done. Why would you carry around four cells if all you're going to do is burn off the entire output of one cell as heat? Why not just carry three, save the weight, cost, complexity, and power?
