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View Full Version : Motor amperage help please


skyhighdiver
05-14-2012, 08:58 PM
Have a leo 2200 kv
t180 esc
nanoteck 5000mah 65c batterys 4s X2
m445 prop

how the hell do I know what the amp draw is if no eagle tree any close guesses for me:help:
TheShaughnessy
05-17-2012, 02:42 AM
http://www.hobbyking.com/hobbyking/store/__10080__Turnigy_130A_Watt_Meter_and_Power_Analyze r.html# you could get one of these, see link

I have one I'd be willing to get rid of since i upgraded to an eagle tree system. It would at least let you know your max watts/ amps. Min voltage and Mah consumption
siberianhusky
05-17-2012, 06:27 AM
1) Time your run.
2) Find out how many MAH went back into the battery after the run.
Simple math will then tell you what you average amp draw was over that time period.
Doesn't really give you much useful info, but it is a ball park average.
Fluid
05-17-2012, 06:59 AM
No need for "simple math" - http://www.offshoreelectrics.com/conversion.htm Get the boat on plane and run full throttle for the full time - make sure that it won't overheat first.

Finding your maximum amps is almost useless with a WATT meter etc. Even a very reasonable setup can draw well over 200 amps just getting on plane. There is no way anyone can make any kind of reasonable guess without knowing the exact prop, motor, timing, hull attitude, etc.



,
TheShaughnessy
05-18-2012, 06:35 PM
No need for "simple math" - http://www.offshoreelectrics.com/conversion.htm Get the boat on plane and run full throttle for the full time - make sure that it won't overheat first.

Finding your maximum amps is almost useless with a WATT meter etc. Even a very reasonable setup can draw well over 200 amps just getting on plane. There is no way anyone can make any kind of reasonable guess without knowing the exact prop, motor, timing, hull attitude, etc.



,.

There is more then one way to get on plane. The watt meter also measures mah consumption so that plus a timed run would give u an average. Also knowing how much your batteries sag under load is useful info to me. Also if you know your speedo is only rated for a 100 amp burst and you measure spikes past that on a short run you may be able to save a speedo. Rolling on the throttle will keep spikes down and can provide useful info.
I know you have far more exp then me, but that is my take