Friends:
This situation is as yet unresolved. It is complicated enough I created a web page <https://millersolar.com/MillerSolar/case_studies/36_SIFortress/36_SunnyIslandFortressIntegration.html> to describe the scenario so I did not have to explain it over and over. I submitted this to Fortress tech support. They said they had likely not tested the Fortress compatibility with SI in an AC-Coupled system. While Fortress technicians and/or engineers ponder the situation I am brainstorming solutions. One idea is to convert to a DC coupled system. DC Charge controllers will have intrinsically better voltage control. The charge controller most likely suitable is the Schneider 600 volt 100 amp unit. I would need two of them. It is compatible with the existing string wiring. In researching it many questions came up about that product’s suitability. There is an integration guide for a Schneider system and Fortress but this would be a mixed system of Schneider and SMA. Would I be able to apply closed loop communication to both systems? Could the charge controllers work in open loop? Has anyone tried anything like this? I will keep you apprised. William Miller Miller Solar 17395 Oak Road, Atascadero, CA 93422 805-438-5600 www.millersolar.com CA Lic. 773985
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