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I am looking for a circuit ,12V, 40Amp load tester for a car battery I would like to build one.
Can you help me with this request.
have a good new year Thank you, Greg.
Maybe some NiCr wire?
Nichrome changes resistance when it heats up, don't use that. I kind of like flat5's idea... about two-hundred feet of twelve-gauge solid enameled wire in a bucket of water would be about .3 ohms and ought to handle 500 watts.
You can buy a small load tester for about $15. I doubt that you can build one that cheap.
You can see the insides of a larger 500A tester at this site. It uses a pile of carbon disks as its resistance element. Changing the pressure on the disks changes the resistance of the pile.
Could I use copper bars or brass bars for a big resistor to do the same thing as I have them on hand 100 x 4mm x 25mm I have 4 of them.