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« on: April 03, 2014, 09:44:48 AM »
docnayeem
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Hello !
After a lot of trial and errors .. Posting and reading posts , overheated / burnt ESC and a never ending hunt for a wattmeter decided to do some DIY stuff
Here it is
A DC ammeter a shunt resistor and a volt meter is what you require
Rest every thing is quite straight forward
You need to connect the ammeter in between the ESC and Battery and the voltmeter ( a digital one available at LHS for 300 bucks ) at the charging end.
Run the motor with the prop at full throttle .. Chect the current and voltage .... Record it
Then some maths ...
P= I*V where P is power and I is current and V is voltage
( one tachometer if available can really get you all that you need right now this is the setup ... Tachometer will be added soon )

tmp_IMG_20140403_090904-1258202715.jpg
DIY ammeter voltmeter combo for ESC , prop selection
* tmp_IMG_20140403_090904-1258202715.jpg (38.12 KB, 800x600 - viewed 638 times.)
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« Reply #1 on: April 03, 2014, 10:47:42 AM »
saikat
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Actually if you a use a shunt - you can use a multimeter as a wattmeter

better to buy a multimeter from your local market
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« Reply #2 on: April 03, 2014, 10:57:21 AM »
docnayeem
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Re:

Tess but calculating the shunt value  would be a issue and it won't give you a direct reading ...
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« Reply #3 on: April 03, 2014, 10:57:45 AM »
docnayeem
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Re:

Typo Tess = yes
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« Reply #4 on: April 03, 2014, 11:09:33 AM »
docnayeem
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A DC ammeter comes with a precisely calibrated shunt and will give you a direct reading .. And for a layman like me its better
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