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In this paper, we propose a way to reuse obsolete older model PCs as a grid in keeping with green IT. A grid can create a high performance environment consisting of ordinary PCs. However, it has continuous energy requirements. This is undesirable in terms of environmental concerns, because of the increased CO2 emissions from generating the required electricity. Therefore, this study aimed at realizing a grid powered using solar power to overcome the disadvantage, while reusing obsolete older model PCs. Purpose in this study is extending the operating time of the prototype that is of our proposal for the system. Extending the operating time need to improve power consumption efficiency of the system. Using DC/DC converter instead of DC/AC converter that is used by the system, we improve the system and extend the operating time of the system. And we experimented operating the system composed of two reuses PC.