This 1000-amp / 100mV Deltec shunt is the industry standard. Calibrated with an accuracy of ± 0.25%, it is larger in size than the 500 amp shunt - meaning the Whiz Bang Jr. does not fit this shunt. Bolt size is ½".
Radian uses a 1000A / 100mV shunt. SMA uses a 1000A / 50mV shunt.