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Across 1. Time required for any energy producing system or device to produce as much useful energy as was consumed in its manufacture and construction 3. Installed system that is not connected to a utility network 5. Network of energy transmission lines 6. The smallest complete environmentally protected assembly of interconnected photovoltaic cells. 7. The process that produces electricity from sunlight 8. Electric current in which electrons are flowing in one direction only 9. Amount of power output a PV module produces at standard test conditions 11. The amount of electric power being consumed at any given moment 12. Energy storage device

Down 2. Maintains the battery at the highest possible state of charge, provides user with required quantity of electricity, and protects battery from deep discharge 4. Converts direct current into alternating current 10. Unit of energy