ProStar MPPT Operator’s Manual
35
4.0
4.1 TrakStar MPPT Technology
The ProStar MPPT utilizes Morningstar’s TrakStar Maxi-
mum Power Point Tracking technology to extract maximum
power from the solar module(s). The tracking algorithm
is fully automatic and does not require user adjustment.
Trakstar technology will track the array maximum power
point voltage (Vmp) as it varies with weather conditions,
ensuring that maximum power is harvested from the array
through the course of the day.
Current Boost:
In many cases, TrakStar MPPT technology will “boost” the
solar charge current. For example, a system may have 2
amps of solar current flowing into the ProStar MPPT and
5 amps of charge current flowing out to the battery. The
ProStar MPPT does not create current! Rest assured that the
power into the ProStar MPPT is the same as the power out
of the ProStar MPPT. Since power is the product of voltage
and current (Volts x Amps), the following is true*:
(1) Power Into the ProStar MPPT = Power Out of the ProStar
MPPT
(2) Volts In x Amps In = Volts Out x Amps Out
* assuming 100% efficiency i.e. if no losses in wiring and
conversion existed.
If the solar module’s Vmp is greater than the battery voltage,
it follows that the battery current must be proportionally
greater than the solar input current so that input and output
power are balanced. The greater the difference between the
maximum power voltage and battery voltage, the greater
the current boost. Current boost can be substantial in
systems where the solar array is of a higher nominal voltage
than the battery as described in the next section.
4.0 OPERATION