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You buy a 75mV 30A shunt resistor.
They are specifically designed for that purpose.
If you have a 30A meter, it already has it built in.
† DC current meters are self-contained for ranges up to and including 50 amperes.
Higher range DC current meters (50 mV) listed above are calibrated for 5’ leads and
require external shunts.
Not necessarily. Lots of meters utilize remote shunts. That way you mount the meter on the dashboard, and the shunt in the engine room. The sense wires that drive the meter can be #22awg instead of #6, and quite long...If you have a 30A meter, it already has it built in.
Good Point.Not necessarily. Lots of meters utilize remote shunts. That way you mount the meter on the dashboard, and the shunt in the engine room. The sense wires that drive the meter can be #22awg instead of #6, and quite long...