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Based on its astronomical location, Indonesia is a country that crossed the equator and is included in tropical climate. Therefore, rainfall in Indonesia can be quite high with an average rainfall ranging from 2000 – 3000 mm per year. On the other hand, Indonesia is a country that has a clean water crisis. This is caused by climate change and water pollution which affects the availability of clean water for the society. Based on the data, the proportion of water crisis areas in Indonesia increased from 6% in 2000 to 9.6% in 2045. This makes the implementation of rainwater utilization very necessary, considering still many areas in Indonesia are often affected by droughts and clean water crises. The utilization of rainwater into clean water is also one of the efforts in realizing Sustainable Development Goals (SDGs) Number 6. The design of the water tank automation system is one of the innovations that can be used to utilize rainwater into clean water so that it can be reused for society. In the process, a reaction with an electrolysis cell is needed to decompose water compounds into hydrogen and oxygen gas using a simple water electrolysis unit that runs manually and takes quite a long time. The addition of an automation system using sensors can help the effectiveness of the system from the beginning to process monitoring. In addition, the use of solar panels as a water bank automation system resource will help reduce the production costs required for a water bank system.
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