3DR Power Module Limits

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Emin Bu April 28, 2015 at 9:11am

It is real shame we still do not have simple solution from 3DR which can measure around 200A/8S.
- 100KM
  
  Hein du Plessis > Emin Bu April 28, 2015 at 9:48am
  
  That's almost 7 kilowatt.. I don't think such a setup exists!
  - Admin
    
    Thomas J Coyle III > Hein du Plessis April 28, 2015 at 10:06am
    
    @Hein,
    
    Any member who can afford a large current capacity 8S LiPo can afford to get some developer to create such a current sensing module:-)
    
    I presently use 8 gage wires to connect my 6S LiPos to my water cooled ESC that can handle 220 amps continuous and I use the ESC's data logger to get an idea of the current consumption when running over the boats speed range.
    
    I am more interested in the battery voltage than current consumption and that can be measured through any proportional voltage circuit.
    
    Regards,
    
    TCIII AVD
Dom April 27, 2015 at 7:36am

Hey guys.. I have the same question as David - 4 sites and not a definite answer. What happens if current goes over 90A? Will the module burn? Will it just not measure it?

My Copter will consume 100A maximum I know this will happen not often. But it can.. So what to do? And is it correct that Pixhawk just measure 60A, regardless what Power module (ATto 180A e.g) I use?
- Admin
  
  Thomas J Coyle III > Dom April 27, 2015 at 8:01am
  
  @Dom,
  
  The Pixhawk can only measure up to 60 amps with the 3DR Power Module.
  
  If the 90 amp current rating of the 3DR Power Module is exceeded, the current shunt resistor will probably overheat and burn open.
  
  However the Pixhawk can measure up to 180 amps when using an AttoPilot current sensor board by following these instructions Link
  
  Regards,
  
  TCIII AVD
  - Dom > Thomas J Coyle III April 28, 2015 at 10:01am
    
    Thank you very much. Ordered a ATTO now, even I think its way overpriced ;D
MR60

Hugues July 16, 2014 at 11:07am

To help on your question, we first need to know your config:

-What is your total flying weight including batteries ?

-What are your motor specs and prop specs ?

-What are your batteries specs (number of S) ?

Then I can estimate how much current you will consume at hover ~50% throttle (you will/should normally never fly at more than 80%)
Ken Gaines July 16, 2014 at 9:35am

Not a hijack here...

So the APM power module shouldn't be used with voltages over 4S? I originally had this thing wired using a Buck Boost and AttoPilot according to this thread:

http://diydrones.com/profiles/blogs/powering-your-apm-drone-or-how-...

As of right now, the thing flies fairly well and I haven't noticed any voltage problems with the APM power module and 2x 5S batteries in parallel...yet. Would it be a good idea to go back to the alternate wiring scheme?
Emin Bu July 16, 2014 at 1:53am

Since my 10kg octa can draw 60A in hoover and can go to 150A+ in max,simple solution is;

you connect 2 LiPo in parallel and connect Power Module (PM)just thru one....that way PM will take only half the current..MP will also show half but you can easy multiply that with 2 and be aware of that when checking logs...

and BTW. Pixhawk can only measure 60A,and APM 90A....it does not depends only on module you get...
Pedals2Paddles July 15, 2014 at 8:45pm

My question is why are you even on this website if you hate everyone and everything, and do nothing but complain? Just leave.

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3DR Power Module Limits

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