How to buy crimping players for solar connectors:

• They have fully to match the type and size of connectors we use. That has to be determined based on the wire section for the specific type of cable we intend to crimp (attach a determined type of terminal to the wire or cable ending). 
• They have to be equipped with interchangeable dies and to allow us to interchange those dies with other section types of dies (like AWG #10,#12 and so on) or replace them if they are worn out or they become defective. They have to be equipped with a calibrator attached to the tool’s body in order to allow a very precisely crimping procedure. (see product movie)

Measuring the strand diameter and number of strands is a more accurate method. Use the following formula for cable area if the cable is not on the chart: 

cable area (mm²) = 0.785 x (strand diameter in mm²) x number of strands 

Rennsteig, a solar industry professional leader for crimping and striping tools industry, is referencing following set of instructions as a general guidance in this matter:

• Make sure the proper inserts, terminal holder, and wire stop are used for the intended terminal and wire gauge size.
• Check the tool numbers, terminal name, and wire gauge sizes on tool parts, and check the terminal part numbers and cable gauge sizes from authorized wiring diagrams or other documents.
• If the cable gauge size is not available, strip a sample of cable to be crimped and verify the gauge size by comparing the outside copper core diameter to the charts. (Do not distort or cut strands in the core). 
   

Note:

• Set content it is based on Dies and  Calibrators.
• Kit content it is based on Dies, Calibrators,  Insulation Stripper and Cable Cutter