TS-MPPT-600V-48 Wind charging control Info
3
It is critical that the input voltage of the TriStar MPPT controllers never exceeds the rated max. input voltage of the
controller (150V or 600V). The TriStar MPPT controllers’ transistors can get damaged if exposed to voltages in excess
of the rated input voltage, even if the transient is only microseconds in duration. The simplest solution is to use a
turbine with a maximum open circuit voltage which cannot exceed the maximum input voltage rating of the TriStar
MPPT controller (150V or 600V). Turbines which can potentially produce higher maximum open circuit voltages will
require overvoltage protection which prevents any overvoltage under all circumstances. The turbine and system
requirements section of the paper discuss overvoltage protection further.
The TriStar MPPT controller system will still require a means to keep the turbine’s rotational speed under control
during voltage regulation periods. It cannot simply start reducing power when the batteries are full since that would
cause the rotational speed to increase out of control. One option is to use the TriStar controller in diversion mode.
See Figure 2.
Figure 2: TriStar-MPPT/ TriStar Diversion System
The TriStar-MPPT/ TriStar Diversion System allows TriStar MPPT controller to operate at full power (bulk charging
mode) continuously while the TriStar diversion controller handles the regulation voltage control. This will maintain
continuous operation of the Voltage vs. Power Bulk charging MPPT operation at all times.
To set up a TriStar-MPPT/ TriStar Diversion System the TriStar MPPT controller(s) use higher regulation voltage
settings than the TriStar diversion controller. The TriStar diversion controllers would be set up in the same manner as
a typical nominal voltage diversion system would. The TriStar controllers will need to be able to divert the full output
current from the TriStar MPPT controller(s). See the TriStar Diversion Control section of the TriStar Manual for
further details on how to design and configure TriStar Diversion circuits. http://support.morningstarcorp.com/wp-
content/uploads/2014/07/TS.APP_.Diversion.01.EN_.pdf