Welcome to ECN, mate!.
Just a few questions regarding your Motor Installation:
What are these motors to be used for?
What Brand are the motors?
Will any other equipment be affected by the Voltage Drop, caused by starting 2 10 Horse motors?, will they start at the same time?
Have you considered using Electronic starters/controllers on these, they are a lot "easier" on the supply.
Look forward to your reply.
