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Black & white, static graphics used in Solar Energy International's Photovoltaics : Design and Installation Manual. A grid tied, photovoltaic system with battery back up is complex, with mutiple routes and controls in place to handle the flow of energy. While the above static graphics are correct, it only demonstrates one basic situation, without showing how various scenarios affect the system. From one concept, mutiple learning situations can arise, and several "what if" questions can be answered with animation that are left unknown with static graphics like the ones above.