Manual

29 | P a g e
shaded (if this feature is enabled).
SOLAR mode is best suited for shaded or un-shaded PV arrays that are at least one nominal voltage
above the battery voltage. For severe partial shading or PV arrays with nominal voltage equal to battery
voltage, you may also want to try Legacy P&O (Perturb and Observe) MPPT mode.
Legacy P&O
Legacy P&O (Perturb and Observe) mode is a slow tracking mode similar to the Micro Hydro mode but
with the difference that it is slightly faster and will shut off if the power source goes off.
It has 2 settings that are user adjustable. Sweep Interval is the time between mini-sweeps, in minutes, and
sweeps around the present (i.e. the last found), MPP Voltage. The range of this sweep is determined by
the Sweep Depth user adjustment and is expressed as a percentage of Watts that the sweep started
from. For example, if in Legacy P&O mode, the Classic was outputting 500 Watts and the Sweep Depth
percentage was set for 10%, (50 Watts), the sweep will bring the input voltage DOWN until the output
power drops down to 450 Watts, then will sweep UP in voltage until the power drops again down to 450
Watts and then go back to the newly found MPP Voltage, waiting for the next sweep.
This mode is also useful for such items as DC generators or rectified ac alternators being driven by a
fossil fuel engine. An Example would be a Lister diesel with an Other Power 3 phase alternator. The AC
output would be rectified and run into a Classic set for legacy P&O.
NOTE ON HIGH VOLTAGE-HIGH POWER INPUT SOURCES... When using an unlimited power
source, it is recommended that the input voltage not be much higher than 4 or 5 times the output (battery)
voltage. i.e. Don't try to charge a 12V battery from an unlimited input power source sitting at, say, 200
Volts. The Classic is able to work with high power-high voltage sources but will usually require an input
voltage dropping power resistor in series with the input voltage source. Please call a MidNite technical
representative for advice on what size input resistor to add to the input for these special cases if you are
unsure what to place in-line and we will try to help.
Wind Track
This mode uses a power curve that is either built by the user or one of the pre-installed graphs. The power
curve consists of 16 set points that consist of output amperage and input voltage, allowing the user to
custom build a curve for their Wind turbine. Please refer to the Wind section of the manual for full details
on programming the curve as well as our video that will help in understanding how to adjust these curves
using the wind graph editor.
Dynamic
This is typically used for PV (solar) input sources and tries to follow, on a slow dynamic basis, the
changing conditions of the input source. This mode has one user adjustment which is a forced sweep
perturb trigger interval for times when the input condition changes do not trigger a dynamic sweep. The
interval is in units of minutes.
U-Set VOC%
This is a fully manual mode based on a percentage of VOC. The Classic will sweep based on the user set
time in minutes and then park at a user set % of the VOC the Classic found on that sweep. This mode is