At start-up, and periodically during operation, Morningstar products perform various tests on internal components and circuitry. In the event an issue is detected with a component or circuit, the controller will cease operation and display the appropriate LED combination alerting the user of the failure. Additional, “Self Test Fault” will be displayed on any Morningstar meters connected to the controller. This is done to protect against potential system damage due to failed components.

Traditional PWM vs Morningstar’s TrakStar™ MPPT Technology


Tech Support Policy

TriStar MPPT Processor A Firmware Update

v32b Firmware and above addresses EEprom access bugfix causing watchdog trip and subsequent lowside FET turn on.  This issue is generally limited to Controllers installed in applications utilizing all, or most, of the following items in the design.  -High I/O of Communications, -Read/Write of vb_ref register (0x0033), -Read/Write of ib_ref register (0x0058), -Write of battery current limit (0xE01D), -Coil command restart of controller, -48V Systems, -Oversized Arrays.  The following link provides instructions on updating firmware:


Follow us on

Most Popular