Controller Technology

In Uncategorized by African Energy

Judging from the backlog in orders of MPPT controllers, customers are waking up to the advantages of this technology.  The old faithful Outback FM-60 and FM-80 and the newer Xantrex XW-MPPT 60 are now joined by the new Morningstar TS-MPPT 45 and 60.  Plus the Morningstar SS-MPPT 15 controller becomes very useful for smaller systems.  I predict that in five years  we will hardly be using traditional controllers.  But what is the correct way to size an off-grid system with a MPPT controller, since its impact will vary with the module temperature and with the state of charge of the battery?  Start with a healthy de-rating of the module (probably beyond the PTC rating) and the controller (most will be better than 95% efficient) and then just use the de-rated watts of the module.  It is so much easier than traditional sizing that it seems like cheating….