power assisted horizontal chimneys?

I have a 6in stove pipe running out of a proposed 4in rocket barrel heater which is on the west eve side of my walkout basement half wall. Running an insulated chimney above the roof peak is cost prohibitive. My home is very remote and I'd like to try a horizontal metalbestos chimney that would exit several feet from the house over a sand pit with spark arrestor. Are there any solar fans I could use to create draft? Thanks, Steve