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Jack,
Your close. The Lems work off a zero current position of 2.5 volts. Therefore, the 50 amp Lem would read 2.5+.625 volts at 50 amps discharge or it would read 2.5-.625 at 50 amps discharge. They do produce a linear output all the way to their max current allowable so 150 amps discharge would be 4.375 volts. You do need to check them at their zero current voltage. They are usually off by a few mv.
Rick
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