The LVD/LVDR function of Morningstar controllers is designed to protect system batteries from overdischarge and (to a lesser extent) protect sensitive system loads from low battery voltage. When the battery drops to the LVD threshold, loads connected to the controller are shut OFF to give the batteries time to recover their charge. When the battery voltage rises above the LVDR threshold, loads that were previously disconnected are turned back ON. Low Voltage Disconnect/Reconnect does not affect the controller’s charging ability; charging continues whether in the disconnected state or in the connected state.

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