Using a Super Whatt Meter on a Boat?

[TLH101]

Back when I flew electric R/C aircraft, we lived and died by the Astro Super Whatt meter.
Is this a feasible tool for checking amp draw in an R/C boat set-up? Can I get an accurate reading with the boat powered up and held static?

[photohoward1]

Not held static. There will be no load on the Motor.

[TLH101]

Not held static. There will be no load on the Motor.

I meant static in the water.

[jkflow]

Could be done but this is a low Amp wattmeter, I believe it tops at 15A, barely usable. Maybe for a toy pool boat or for scale type boats.
I assume it holds the max value that you can read after the fact.

[TLH101]

Could be done but this is a low Amp wattmeter, I believe it tops at 15A, barely usable. Maybe for a toy pool boat or for scale type boats.
I assume it holds the max value that you can read after the fact.

This a 100 amp capacity.
20250201_114921.jpg

[Silver954]

The loads in boating can swing wildly. It will be easy to burn up this device, plus the extra resistance in connectors.

Just an example, 1/8" in strut depth can be the difference between 95a and 225amps. So you want the least resistance possible.

[Peter A]

If you want to check the amp draw etc then it would be best to purchase an esc with data logging.