Classic Manual Rev L
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Long Distance Wire Runs
The Classic offers some unique opportunities if you are faced with longer than normal wire runs
between the DC source and the Classic. The Classic comes in three input voltage ranges letting you
design a DC source at a higher voltage if it is beneficial. For example, let’s say you have a 300-foot
run from a PV array to the Classic. You could wire for an open circuit voltage close to 250V
accounting for the coldest temperature you will encounter. This will allow you to run a smaller
gauge wire than with a lower voltage charge controller. The efficiency of a high voltage Classic is
less than the lower voltage versions, so you need to weigh the benefit. If this sounds too
complicated, use this rule of thumb in selecting the proper Classic: PV runs up to 100 feet - use the
Classic 150; runs up to 180 feet - use the Classic 200, or above 180 feet - use the Classic 250.
If the wire size between the DC source and the Classic is larger than the Classic's DC terminal
connector, you can use a splicer block or similar connector to reduce down to #4 AWG close to the
Classic. The MidNite E-Panels are supplied with a PV input bus bar that accepts up to # 2/0 AWG
wire.
Connecting the Classic to the Clipper
The connections between the Clipper and Classic are simple. There are the DC – and + conductors
from the Clipper to the PV input on the Classic. There is also a smaller set of – and + conductors
connecting AUX 2 to the PWM input on the Clipper.
Diagram 2 – Classic and Clipper Wiring
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