no battery Archives – The Green Optimistic green tech news, since 2008 Fri, 07 Aug 2015 20:01:20 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 2667534 Blue Marble – Solar-Powered Irrigation System Without Batteries https://www.greenoptimistic.com/blue-marble-solar-irrigation-20150807/ https://www.greenoptimistic.com/blue-marble-solar-irrigation-20150807/#respond Fri, 07 Aug 2015 20:01:20 +0000 https://www.greenoptimistic.com/?p=56161 Blue Marble is a smart irrigation system, which waters your garden for 48 hours using only solar power even at night, yet it is completely battery-free. As temperatures continue to rise, crucial arable land is being lost. Drought poses an increasing threat to agriculture and irrigation becomes a dangerous issue in more and more regions […]

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