Select Morningstar controllers allow for precise measurement of battery voltage using the connection labeled ‘Battery Sense’. Long wire runs or small gauge wire connecting a controller and the battery may experience a voltage drop across the line. This can lead to undercharging of the battery. A battery sense connection should be used to provide an accurate reading of actual battery voltage to the Morningstar controller.

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