why buy two new panels. swap them if the total load to the sub panel is < 100 amp, else, buy one new 200 amp panel as your sub (make sure the interconnecting wirings are rated for 200 amp).
why buy two new panels. swap them if the total load to the sub panel is < 100 amp, else, buy one new 200 amp panel as your sub (make sure the interconnecting wirings are rated for 200 amp).