Hsu, P.-C.P.-C.HsuHuang, B.-J.B.-J.HuangWu, P.-H.P.-H.WuWu, W.-H.W.-H.WuLee, M.-J.M.-J.LeeYeh, J.-F.J.-F.YehWang, Y.-H.Y.-H.WangTsai, J.-H.J.-H.TsaiKang LIKUNG-YEN LEE2020-01-172020-01-172017https://scholars.lib.ntu.edu.tw/handle/123456789/451517We have developed an isolated-type hybrid solar PV system (HyPV) operating under stand-alone PV mode or grid mode, interchangeably by an ATS (automatic transform switch) [1]. No solar PV power is fed to grid. The energy generation efficiency of HyPV is actually the same as the stand-alone solar PV which is usually lower than that of FIT (feed-in-tariff) PV systems (feeding all solar power to grid for tariff through a MPPT/inverter) due to the unbalance between battery storage capacity and variations of solar radiation and load demand. In the present study, we has shown from long-term field test of five HyPV systems, that the energy generation efficiency of HyPV is very close to that of FIT PV systems. © 2017 The Authors. Published by Elsevier Ltd.[SDGs]SDG7[SDGs]SDG13Electric power transmission networks; Solar energy; Systems engineering; Battery storage; Energy generations; Feed-in tariff; Load demand; Solar PV systems; Solar PVs; Stand -alone; Term field; Energy efficiencyconference paper10.1016/j.egypro.2017.11.0182-s2.0-85039999085https://www.scopus.com/inward/record.uri?eid=2-s2.0-85039999085&doi=10.1016%2fj.egypro.2017.11.018&partnerID=40&md5=b3ce65b5cfd3deffe11c08b335edaef9