Manual

MATE3s Screens
900-0209-01-00 Rev B 43
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 page 66.
Figure 38 MPPT
The MPPT Modes perform the following functions:

Auto Track
(default) automatically measures the PV upon wakeup and then tracks the MPP. (See page 66.)

U-Pick
allows the user to manually adjust the MPP tracking limit as a percentage of the array's V
oc
.
The Wakeup VOC Change settings (VDC and Time) adjust the V
oc
conditions that cause the charge
controller to wake up during “Sleep” or “Snooze” operation. (See Table 4 on page 34.) Both settings may
help adjust for varying conditions. Since environmental conditions impact the open-circuit voltage of an
array, the Wakeup VOC Change VDC can be based on the last measured V
oc
value.
Before changing these values, monitor the system for a week or so using the factory defaults and then
gradually adjust the set points. If the set points are set too high, the charge controller might not wake up
soon enough or often enough, which means a loss of power production.
Temperature Compensation
The Temperature Compensation screen allows the user to control the Absorbing and Float voltage
limits during charging when using a Remote Temperature Sensor (RTS). The RTS adjusts charging
voltage depending on battery temperature. See page 68 for an explanation of compensation.
Figure 39 Temperature Compensation
Set Points:

MPPT Mode –
Selects between
Auto
(which allows automatic MPPT) and
U-Pick
(which limits the maximum
power point tracking to a specific percentage of array voltage).

U-Pick VOC% –
The percentage of open-circuit voltage (V
oc
) used as the MPP tracking limit in
U-Pick
mode.

Wakeup VOC Change VDC –
The change in V
oc
which will bring the controller out of “Sleep” or “Snooze”
operation regardless of the
Time
setting. (See page 34.) The controller will begin locating the power point
(“sweeping”). The change in V
oc
is the indicator that power may be available.

(Wakeup VOC Change)
Time –
The timer setting to leave ”Sleep” or ”Snooze” operation regardless of
Change VDC
. The controller will enter MPPT. (It may re-enter “Snooze” and restart the timer if no power
is available).

Snooze Mode Amps –
The output current limit below which the controller enters “Snooze” due to inactivity.
Set Points:

Mode –
Selects between
Limited
(which uses the upper
and lower voltage settings below) and
Wide
(which uses
the entire range of compensation).

Slope –
The amount of temperature compensation. This
is measured in millivolts per degree C per battery cell.

Limited: Lower Battery Voltage –
The lowest range for
temperature compensation in
Limited
mode.

Limited: Upper Battery Voltage –
The highest range for
temperature compensation in
Limited
mode.