You could loan some money; that’s the first easy step. TD bank offers good loans for clean energy projects. You invest a small capital and get the rest as a loan. This will only extend the payback period, but nothing significant.
Or, if you have a FIT project, you could lease the system, or rather, the space. This is not allowed for microFIT projects.
When leasing, the owner of the house/land will sign the contract with the OPA. You should find an investor who is willing to lease the system from you. In that case, you are essentially selling the system to the investor, and leasing the space for 20 years. You will earn less money, but on other hand you don’t have to invest any capital, or worry about operation and maintenance of the system.