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Maximum Power Point Tracking
975-0400-01-01
1–3
•
Battery Temperature Sensor (BTS) to provide automatically temperature-
compensated battery charging. If the BTS is lost or damaged, a replacement
can be ordered from Xantrex (part number 808-0232-02).
•
Xanbus
®
-enabled. Xanbus is a network communications protocol developed
by Xantrex. The XW SCC is able to communicate its settings and activity to
other Xanbus-enabled devices, such as the XW Series Inverter/Charger, the
XW System Control Panel (SCP), XW Automatic Generator Start (XW-
AGS), and other XW Solar Charge Controllers.
•
Five-year limited warranty.
Maximum Power Point Tracking
Maximum Power Point Tracking allows the XW SCC to harvest the maximum
energy available from the PV array and deliver it to the batteries.
The MPPT algorithm continuously adjusts the operating points in an attempt to
find the maximum power point of the array. The algorithm can then determine if it
is harvesting more or less power than the previous operating points.
The XW SCC applies a variable load on the array—shown by the power curve
(solid line) in Figure 1-2—until it finds the maximum wattage (the point at which
both operating voltage and current can be maximized at the same time), as
indicated by “MPP” in Figure 1-2. The XW SCC then holds the array at this point
for as long as the array continues to produce the maximum power possible. As
panel shading, cloud cover, and sunlight angle shift, the XW SCC finds the new
maximum power point without interrupting its output power flow.
Figure 1-2
Maximum Power Point Curve
20
18
16
14
12
10
8
6
4
2
0
Cu
rre
n
t (I) Am
p
s
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
V o l t a g e ( V ) V o l t s
Isc
Imp
MPP
Vmp
Voc
W
at
ts
Summary of Contents for XW-MPPT60-150
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