Net Cost is the estimated gross (total) cost of installation minus any and all financial incentives, even those that may materialize after installation (Year 1 and later), such as performance-based incentives.
Net Cost at Installation is the estimated gross (total) cost of installation minus any financial incentives that may materialize at the time of installation (not in later years).
Tax savings that may result from depreciation are not included (as may be applicable to business scenarios). Also, there may be income taxes associated with rebate and incentive amounts you will receive. If you are investing in a renewable energy system please consult with a tax preparer.
Go to www.solar-estimate.org