• Have you tried out dark mode?! Scroll to the bottom of any page to find a sun or moon icon to turn dark mode on or off!

diy solar

diy solar

inrush current devices

e67

New Member
Joined
Jul 7, 2022
Messages
282
Location
plains
I guess my killaWatt can't measure start up current. AC .... are there any cheap clamp on or other style devices that can and work well?I have an automobile unit but that is too big..
 
I’ve got a Kaiweets HT208D which works great for measuring peak inrush. Seems to be a good meter if you just need to know the peak value.

I need more information about a load, though, I need an oscilloscope to measure the duration of the inrush surge. Can anyone recommend a cheap usb probe that will do the job for a 240V load?
 
To clarify, the HT208F and HT208D are the same meter and they both do inrush and have all the same functions. The only difference is that the HT208F has a monotone LCD screen that is visible in direct sunlight, while the HT208D has a full color screen that does not work so well in direct sunlight.
 
I almost bought the HT208F (mono screen) without realizing the inrush current function only works for AC, not DC.

Can the max function be used to approximate DC inrush? Among other things I'd like to measure transient DC current at time of inverter startup.
 

Attachments

  • Screenshot_20250128-122233.png
    Screenshot_20250128-122233.png
    151.8 KB · Views: 4
Last edited:
Can the max function be used to approximate DC inrush? Among other things I'd like to measure transient DC current at time of inverter startup.

I would caution that extremely fast transient spikes would not be picked up by the max function. For example I needed to test the AC inrush current on a pump with an LRA of 57A and a FLA of 14A. Using the inrush function I see ~52A, but using the max function I only see 25A. Unfortunately I don't have an oscilloscope to provide more details on the time periods.

Another thing to look into is the inrush showing the absolute peak while I think the max function is RMS, but I'm not 100% positive on that.
 

diy solar

diy solar
Back
Top