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Across 6. The current at which maximum power is available from a module. 8. The process to adding electrical energy to a battery. 9. The demand on a energy producing system. 10. Energy resulting from the flow of charge particles. 12. The maximum total electrical charge which a battery can deliver to a load under a specific set of conditions. 14. An integrated system of electricity distribution. 16. Two or more electrochemical cells enclosed in a container & electrically interconnected in an arrangement to provide operating voltage & current levels. 18. The material through which electricity is transmitted. 19. A standard unit of electrical power equal to 1000 watts. 22. The capability of doing work. 25. A component of a photovoltaic sysstem that controls the flow of current to & from the battery to protect it from over-charge & over-discharge (charge-?). 26. A metric unit of energy or work. 27. The smallest environmentally protected part intended to generate direct current power under unconcentrated sunlight. 28. The point on the current-voltage curve of a module under illumination. 29. An electrical device that allows current to flow in one direction only.

Down 1. The withdrawal of electrical energy from a battery. 2. The solar power disity incident on a surface of stated area & orientation. 3. A unit of electrical current or rate of flow of electrons. 4. A photovoltaic material composes of variously oriented, small, individual crystals. 5. The flow of electrical energy in a conductor. 7. 1,000 kilowatts or 1,000,000 watts 11. An interconnected system of pv modules that function as a single electricity-producing unit. 13. The direct, diffuse, and reflected solar radiation that strikes a surface. 15. A unit that converts a dc voltage to another dc voltage. 17. The two times of the year when the sun crosses the equator & night & day are of equal length. 20. Type of solar electric system that includes other sources of energy. 21. An elementary particle of an atom with a negative electrical charge. 23. The positive anode in an electrochemical cell. 24. An electrically charged atom or group of atoms that has lost or gained electrons. 27. Means of a power conditioning unit that automatically operates the photovoltaic generator at its maximum power point under all conditions.