Morningstar’s Remote Temperature Sensor (RTS) provides improved battery charging in solar systems that
experience temperature variations during the year. The RTS measures temperature at the battery and the
controller uses this data for very accurate temperature compensation. Use of the RTS is recommended
whenever the temperature at the battery will be more than 5°C (9°F) different than the temperature at the
controller. The TriStar has no on-board temperature compensation; therefore the use of the RTS is required for
temperature compensated charging. Other Morningstar controllers will default to an on-board temperature
sensor if a RTS is not connected.