6RL SERIES OPERATION MANUAL
SECTION 6: FRONT PANEL OPERATION
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2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
6RL Series Regenerative DC Load Operation Manual
Page 110 of 204
Application
After the three parameters have been set, the
function can be started. As soon as the MPP has
been found, the function will stop and switch off
the DC input. The acquired MPP values of voltage
(UMPP), current (IMPP) and power (PMPP) are
then shown in the display.
The execution time of this function depends on the
parameter Δt. Even with the minimum setting of 5
ms, one run take already a few seconds.
6.11.2
Mode MPP2
This mode tracks the MPP, so it is closest to
the operation of a solar inverter. Once the
MPP is found, the function will not stop but try
to track the MPP permanently. Due to the
nature of solar panels, this can only be done
below the MPP level. As soon as this point is
reached, the voltage starts to sink further and
so does the actual power. The additional
parameter ΔP defines how much the power
may sink before the direction is reversed and
the voltage starts to rise again until the load
reaches the MPP. The result are zigzag shaped curves of both, voltage and current.
A typical curve display is shown in the picture to the right. For the example, the ΔP was set
to a quite small value, so the power curve looks almost linear. With a small ΔP the load
would always track close to the MPP.
Following parameters can be configured for tracking mode MPP2:
Value
Range
Description
UOC
0...Nominal value of U
Voltage of the solar panel when unloaded, taken from the panel specs
ISC
0...Nominal value of I
Short-circuit current, max. specified current of the solar panel
Δt
5 ms...65535 ms
Interval for measuring U and I during the process of finding the MPP
ΔP
0 W...0.5 PNom
Tracking/regulation tolerance below the MPP
Summary of Contents for 6RL Series
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