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Different type of shunt resister are available in market like 100A/50ma, 100A 100ma etc. You can chose one from these. Basically your controller cannot measure a precise millivolt (A 10 bit ADC can measure 0.0048v minimum), you will gain the shunt voltage by amplifier for more flexibility. Many of types amplifiers are available also (LM339, LM324 OP07........). For example you chose a 100A/100mv shunt rasister and want to see value in decimal value... if you want to go maximum 5v. You chose a amplifier witch can gain input 50 times.
Different type of shunt resister are available in market like 100A/50ma, 100A 100ma etc. You can chose one from these. Basically your controller cannot measure a precise millivolt (A 10 bit ADC can measure 0.0048v minimum), you will gain the shunt voltage by amplifier for more flexibility. Many of types amplifiers are available also (LM339, LM324 OP07........). For example you chose a 100A/100mv shunt rasister and want to see value in decimal value... if you want to go maximum 5v. You chose a amplifier witch can gain input 50 times.
The current in a DC loop is constant throughout so it makes no difference to the voltage you measure across the shunt if it is 'top' or 'bottom' connected but you may find one is better than the other in terms of the voltage with respect to other things. For example, if your circuit passes 100A from a 100V supply, measuring a few mV drop across a shunt with 100V on it may be more difficult than measuring the same few mV at the 0V side of the circuit.
Top of load is the more positive side (nearer to V+/positive output), bottom is the more negative side (nearer to V-). Think of the typical images of a "load" resistor, the bottom is connected to V- (0V).
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