Costs vary depending on whether you purchase your system in cash, use loan financing or go with a lease or power purchase agreement (where available). Loans, leases and power purchase agreements can cost as little as no money down with monthly payments made for the term of the agreement. With cash, you will pay most or all of the amount to the installer upfront, (usually with milestone payments) and receive some back after you claim any applicable tax credits. In all cases though, what you receive is a turnkey solution that includes all equipment, installation, permits, inspections and project management. In many cases, system monitoring services are also included in the price.