Hi (). Yes, your right the drop across the ammeter will make the current look higher to the circuit the way it is. We could move the ground for the reference to the top of the meter I guess. I think the meter needs to be on the ground side for the voltmeter part to work. There wasn't a spec on the meter Jeremy posted, but a similar one quotes 1 milliohm. So I think it is a hall sensor rather than a shunt. That kinda makes since because even a 50 millohm shunt at 100 amps would drop 5 volts and dissipate 500 watts.
I think it will run ok at 48 volts. You will need to double the voltage on the TVS but I think the FET is good for 100 volts. The way it is set up I don't think you can dissipate to much power because the adjustment only goes to about 62 and 31 amps resectivly.
I think it will run ok at 48 volts. You will need to double the voltage on the TVS but I think the FET is good for 100 volts. The way it is set up I don't think you can dissipate to much power because the adjustment only goes to about 62 and 31 amps resectivly.