cheap 20A solar charge controller Our History Shandong Xinxu Group located in Shandong Province, China. We were set up in 2010. Starting from R&D and manufacturing of automatic Lead-Acid battery making equipment. In 2014, Xinxu merged Yantai Goldentide Unikodi Battery Co.,Ltd and began to produce traction battery and industrial battery. In 2016, Xinxu set up environmental branch, lithium battery branch, nuclear equipment and established a joint venture with CSIC to produce oil field equipment. In 2019, Xinxu established international trading branch to integrated international business of all branches. Our Factory 2 Factories in Zibo city, one for 20A solar charge controller website:http://www.xinxu-power.com/