Morningstar TriStar MPPT Series, Инструкция по установке, эксплуатации и обслуживанию

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34 Operation
Operation 4.0
The TriStar MPPT 150V operation is fully automatic. After installation is completed, there are few
operator tasks to perform. However, the operator should be familiar with the operation and care
of the TriStar MPPT 150V as described in this section.
4.1 TrakStar
TM
MPPT Technology
The TriStar MPPT 150V utilizes Morningstar’s TrakStar TM Maximum Power Point Tracking
(MPPT) technology to extract maximum power from the solar array. The tracking algorithm is fully
automatic and does not require user adjustment. TrakStar
TM
technology tracks the array maxi-
mum power point as it varies with weather conditions, ensuring that maximum power is harvested
from the array throughout the course of the day.
Current Boost
Under most conditions, TrakStar TM MPPT technology will “boost” the solar charge current. For
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Rest assured that the power into the TriStar MPPT 150V is the same as the power out of the
TriStar MPPT 150V. Since power is the product of voltage and current (Volts x Amps), the follow-
ing is true*:
(1) Power Into the TriStar MPPT 150V = Power Out of the TriStar MPPT 150V
(2) Volts In x Amps In = Volts Out x Amps Out
* assuming 100% efficiency. Losses in wiring and conversion exist.
If the solar module’s maximum power voltage (V
mp
) 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 V
mp
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.
High Voltage Strings and Grid-Tie Modules
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TM MPPT technology is the ability to charge batteries with solar arrays
of higher nominal voltages. For example, a 12 volt battery bank may be charged with a 12, 24,
36, or 48 volt nominal off-grid solar array. Grid-tie solar modules may also be used as long as
the solar array
open circuit voltage (V
oc
) rating will not exceed the TriStar MPPT 150V 150 Volt
maximum input voltage rating at worst-case (coldest) module temperature. The solar module
documentation should provide V
oc
vs. temperature data.
Higher solar input voltage results in lower solar input current for a given input power. High voltage
solar input strings allow for smaller gauge solar wiring. This is especially helpful and economical
for systems with long wiring runs between the controller and the solar array.