2013
What is Return on Investment (ROI)?
Return on Investment (ROI) is calculated as sum of all returns over the system life divided by the energy system net cost (after all purchase incentives).
For residential (non-business) applications we assume utility savings are in Gross Income dollars ("pre-tax" or what you earned). For business (commercial) applications we assume utility savings result a lower expense write-off against income tax liabilities.
Go to www.solar-estimate.org
