i have 10-3 from panel to one pair of outlets.. i run all the grow through those..
20 amp and ability to run up to 40 amp if i ran 220v..
thats the way to do it.. and then a couple HD extension cords to get where the power is needed.. (rated for 20A obviously)
one time cost of ... $50. but i have an electrician as a room mate/partner in this venture.. i grow and he builds and supply's $$.. sometimes
~MG a.k.a. le Maine développé