Charge Controller Settings
96
900-0117-01-00 Rev A
MPPT
The charge controller uses a maximum power point tracking (MPPT) algorithm which manipulates the
output of the PV array to harvest maximum wattage. Although this function is automatic, this menu
allows the user to adjust many of its parameters for special applications. See the charge controller
User’s
Manual
for more details on these parameters and their applications.
To
access
the
MPPT
menu:
1.
Access the
Charge Controller
menu as shown in Figure 90 on page 94.
2.
Use the control wheel to highlight the
MPPT
menu.
Press the button in the center of the control wheel to accept the selection.
3.
Use the control wheel to increase or decrease the set points to the correct voltage.
Press the button in the center of the control wheel to accept the selection.
This should automatically move the highlighting to the next set point.
4.
After setting the parameters for each set point, press the
TOP
navigation key to return to the
Main
Menu
screen.
Figure 92
MPPT
Set Points:
MPPT Mode:
Selects between
Auto
,
which allows automatic MPPT, and
U-Pick
, which limits the MPP
tracking to a specified voltage.
U-Pick VOC:
Adjusts the MPP tracking limit, as a percentage of the array’s open-circuit voltage (V
OC
).
Wakeup VOC Change VDC:
The controller monitors the array V
OC
for a voltage increase sufficient for
the controller to leave Snooze mode and begin MPP tracking. This setting adjusts the amount of
voltage increase for wakeup. (The
User’s Manual
refers to this under the title “Wakeup Mode.”)
Wakeup VOC Change Time:
The controller monitors the array V
OC
and amperage to see if they are
maintained long enough for the controller to leave Snooze mode and begin MPP tracking. (The
voltage level must be at least 0.3 Vdc above battery voltage; the current level is controlled by the
Snooze Mode Amps
set point.) This setting adjusts the minimum time for wakeup. (The User’s Manual
refers to this under the title “Wakeup Mode.”)
Snooze Mode Amps:
Adjusts the required current level detected by the controller during the wakeup
time (see previous item).
MPPT Range Minimum:
Adjusts the lower end of the controller’s tracking algorithm. This can narrow
the focus of the initial MPPT process. The options are half the array’s V
OC
, or the full V
OC
. (The
User’s
Manual
refers to this under the title “Mpp Range Limit %.”)
MPPT Range Maximum:
Adjusts the upper end of the controller’s MPP tracking algorithm. The
options are 80%, 85%, 90%, and 99% of the array’s V
OC
. (The
User’s Manual
refers to this under the title
“Mpp Range Limit %.”)
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