The charging stage where current delivered to the battery is limited. When the battery reaches the regulation voltage, PWM (pulse width modulation) will hold the battery voltage constant. As the battery becomes more fully charged, the PWM duty cycle decreases as to allow less and less charging current to the battery. This is to avoid over-heating and over-gassing of the battery.

Traditional PWM vs Morningstar’s TrakStar™ MPPT Technology

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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:   https://www.youtube.com/watch?v=J6Duwr5Tl-w&t=10s

 

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