Poor Man's Guide to Homemade Amp Meters
Build a 2,000 amp dc amp meter and learn to make a very easy and inexpensive dc ammeter shunt.
I include this great program free of charge with the ebook download. I then learned another trick (which is in the ebook) that allows me to flip a $3 switch and my cheap multi-meter shows Power in Watts coming from a 12 volt battery bank. (this could be modified for 24 or 48 volt systems) I can flip the switch back and it will go back to amps.
So, to reiterate, with this program and ebook, you can do the following:
You don't need electronic skills to make the shunt. And you don't need to take your meter apart. You just hook up the test leads to the shunt. You can even use little alligator clips to do this.