Quote Originally Posted by dennis13030 View Post
Hi,

My name is Dennis and I am an electronics engineer. The low cost and high current way to go is this;

1. Buy a cheap digital multimeter(the max current rating is NOT important). Believe me on this.
2. Buy a current sensing resistor. See this link. It is a 0.005 Ohm, 7 Watt resistor and it's real cheap($4.16).
http://www.mouser.com/Search/Product...KYZDPMxg%3d%3d
3. Put this resistor inline with the +12V against the electrolyzer.
4. Use the voltmeter to read the voltage across the sense resistor. Whatever value is displayed, multiple it by 200 for the true current value. This calculation is due to the resistor being 0.005 Ohms.

This gets your cheap DMM an effective maximum current measurement of about 37 Amps.
Whoa, I was looking for exactly that... Didn't think of that at all although it makes perfect mathematical sense.
Thanks Dennis, I will definitely try it out... Need to measure current WAY stronger than 10 amps which is the max my amp meter is rated for (although it displays up to 19.9 amps).

Thanks! should have thought of it, but hey, I'm no electronician, just a hobbist!