|Oct 14, 2012, 05:08 PM|
Joined Apr 2012
how to pick a lipo
Hi im new to this and im trying to find a lipo batt. for my brushless motor
Motor specks are 5-13V 100w 3S 1600KV max continuous current 8A and peak is 10A
|Oct 14, 2012, 06:05 PM|
Sverige, Värmlands Län, Filipstad
Joined Jan 2009
Link to motor?
What plane do you intend to use it in?
One usually say LiPo have 3.7 volt per cell so a 3 cell has 11.1 volt (but a fully charged LiPo cell has 4.20 volt).
You can use up to 3 cell LiPo with the specification You have told so far.
How many milliamerehour (mAh) the LiPo battery should have in your case depend how long you want to fly and how heavy battery your plane may be able to carry.
How many amp your motor will draw out of the battery depends on propeller You use.
ecalc hompepage is a good start for that but maybe little early for You now since You are new to this.
You select a speed controler (ESC) that can handle the amp (and some more for safety margin) your setup will draw.
Some speedcontrolers has a BEC so You can connect it to receiver to supply servo and receiver with power.
|Oct 14, 2012, 07:56 PM|
I would suggest a 1300-2200mah battery, 3s of course. My thoughts are that an 1800mah battery would give you good flight time and be a bit lighter than the 2200mah battery making for easier landing weight.
|Oct 14, 2012, 11:14 PM|
It;'s nice if you can use a 20C ... as they are cheap and cheerful prices. Also they are lighter and you can go for a higher mAh capacity for increased run-time.
But generally you would want to go for higher C rating and then battery is suitable for other models as well ... it allows a greater amp demand on it.
When looking at spec's of motors - remember that amps they quote are usually way lower than you experience in real life. Second that the volts range is as designed - but often you can go 1x S rating higher if you are careful with throttle.
To choose your battery :
a) you need to know what cell size ( S rating ... in your case it's pretty obvious you'll go 3S .. 11.1V)
b) you need to know the max amp draw ... with the prop and motor combo. A Wattmeter is called for there .. you could ask around and see if anyone has similar set-up and what size LiPo and ESC they are using.
c) you need to know battery compartment size for maximum pack size possible.
d) you need to know weight of packs.
Most LiPo adverts will give sizes and weights ... so that's sorted. The question remains about amps ... which decides run-time and also what ESC to use ...
Also note that you can go up in prop size and reduce S rating accordingly ... it is common for a model to perform better with a larger prop on 2S pack than a smaller prop on 3S ... using a 2S can also give you a lot better run-time and much bigger capacity pack for same weight etc.
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