A question came in recently about whether the dip switch settings on Morningstar controllers can be changed while the controller is powered ON. The answer is: No, you should turn off the solar breaker and the battery breaker before you change the dip switch settings on the controller.
Although Morningstar MPPT controllers are capable of charging a lower voltage battery from a higher voltage battery, at this time, no information is available concerning the use of a TriStar MPPT 600V Controller to charge a 48V battery bank from the Tesla Powerwall. We recently contacted Tesla about this and we will update you with any new information when we receive it.
Since Morningstar controllers are passively cooled without any internal fans or moving parts, they are very reliable. Fans and other parts are subject to failure and replacement can be very problematic, especially for controllers installed in difficult to access, remote areas. But in addition to issues related to mechanical performance, and debris drawn into the controller by these fans, the noise they create can be irritating in residential applications. With passive cooling, you not only minimize the chance of defects, but you also benefit from the sound of silence.
If your Morningstar controller’s meter is displaying an alarm, it is helpful to consult the meter map for the particular controller you are using in order to access additional helpful information. The arrows on the map correspond to the arrow buttons on your meter, and the sequence that they need to be pressed in order to display the diagnosis. If you did not save the meter map that came with your controller, you can access it on the Morningstar Support site.
During one of our webinars, a question came up about battery temperature sensing associated with Morningstar charge controllers. Just to clarify, our TriStar MPPT family of controllers come with a remote temperature sensor (RTS) included. The TriStar PWM does not come with a remote temperature sensor but an RTS can be purchased separately. All other MS controllers include an internal temperature sensor. In addition to the TriStar PWM mentioned above, if more accurate battery temperature sensing is desired, the RTS accessory can be purchased for the SunSaver MPPT, SunKeeper, SunSaver DUO, and ProStar.