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>> Home > Forum > Electrical Related > Motor Amps
Motor Amps
(681 views)
Author Message
stevethomas
(Sub-Lieutenant)





Forum Posts: 18
24th Oct 2016 13:11  
>> Permalink
mdlbt.com/24051

Hi guys, well it had to happen, time for me to show that I am a rookie at this model boating game.

So how do you check how many amps the motor is producing in the water ?.

Thanks
Steve

Dave M
(Fleet Admiral!)





Forum Posts: 1244
24th Oct 2016 20:40  
>> Permalink
mdlbt.com/24054

Hi Steve
You use an ammeter. You can do this at the lakeside by holding the model in the water and running the motor at full power. This will give an indication of the max current drawn. It will be higher than on the water as the motor will be fully loaded with no forward motion, which will reduce the amps drawn.
There are many Wattmeter/Ammeters available for about £20 and allow for up to 100 amps . For smaller models you may be able to use the amp range on a multimeter up to about 10 amps. The meter is wired in series with the motor and Battery.
There are bits of kit that will measure the current on the water and transmit the info back to the TX. I use such a system with my TARANIS TX. There is a cost involved and if you are just starting the wattmeter is a cheaper and easier to use option
Dave


Live long and prosper

Dave
stevethomas
(Sub-Lieutenant)





Forum Posts: 18
24th Oct 2016 21:31  
>> Permalink
mdlbt.com/24063

Thanks Dave I'll have a go at it, I have a multi meter so can do it with that, also have a good supply of water too we call it a pool so can do the full test at home Bril.

Thanks again Dave

Steve


Haverlock
(Fleet Admiral!)





Forum Posts: 386
25th Oct 2016 23:19  
>> Permalink
mdlbt.com/24068

Watch out most cheap multi meters only go up to about 10 A.

While that may seem a lot when you want to get power from low voltages ( 12V or so ) 10 A is soon exceeded what is the rating of your ESC?

You need to be able to measure round about that figure.

Teeny tiny 1806 motors can draw over 10A

http://www.radioc.co.uk/DYS-1806-2300KV-Motor-p/2014.htm


"that's not a bug its just an undocumented creature."

Sir Terence David John "Terry" Pratchett, OBE (28 April 1948 - 12 March 2015)
cenbeth
(Admiral)





Forum Posts: 164
26th Oct 2016 08:51  
>> Permalink
mdlbt.com/24069

What do you think to clip-on ammeters as used by auto electricians? I think they can measure up to 75A.

stevethomas
(Sub-Lieutenant)





Forum Posts: 18
26th Oct 2016 11:07  
>> Permalink
mdlbt.com/24070

Thanks for that I will have to get a new volt meter as mine only gone up to 10A.

Haverlock
(Fleet Admiral!)





Forum Posts: 386
26th Oct 2016 15:41  
>> Permalink
mdlbt.com/24071

probably cheaper to get a watt meter

http://www.ebay.co.uk/itm/FT08-RC-150A-High-Precision-Watt-M...

one example. They are cheap and made for the job ( probably not as accurate as a good multi meter but WAY cheaper and if you wreck it no big loss)


"that's not a bug its just an undocumented creature."

Sir Terence David John "Terry" Pratchett, OBE (28 April 1948 - 12 March 2015)
stevethomas
(Sub-Lieutenant)





Forum Posts: 18
26th Oct 2016 17:44  
>> Permalink
mdlbt.com/24072

Just ordered one on Amazon, will be here tomorrow %uD83D%uDE0A
Thanks very much for the info
Steve