SMA E-Panel installation manual
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The wiring diagrams show a PV disconnect breaker connected directly after the PV array + busbar and
before the DC-GFP. It doesn’t matter which order these two devices are connected. The DC-GFP can
be connected to the Array plus output before the PV disconnect just as well.
Make sure that the polarity of all DC dinrail breakers is correct. MidNite Solar panel mount breakers
are not polarity sensitive. The din rail mount breakers have a + sign at the bottom terminal. The +
connection needs to be connected to the most positive point in the circuit.
The output of the PV charge controller also requires over-current protection. Most installations will use
either a 63 amp din rail mount breaker (observe polarity) or an 80 to 100 amp panel mount breaker. Use
a red 6AWG wire for the 63 amp breaker and 4AWG wire for an 80 or 100 amp breaker. The charge
controller output breaker must be sized large enough for the expected output. You can always use a
larger breaker and wire than the array output though. The breaker is there to protect the wire, not the
controller, so you can use a 63 amp breaker even if the controller is not capable of outputting more than
30 amps.
Classic Arc Fault Detector:
If your system includes a Classic charge controller then Arc fault
protection is provided for the system. The Arc Fault Detector is a unique safety component built into
every Classic charge controller. Because safety is not an option, MidNite Solar responded to the 2011
NEC code requirements by adding arc fault detection as standard. The Classic is the first charge
controller in the world to successfully stop a series arc. The Classic can detect an arc in less than
100mSec. From low power arcs to devastating high power arcing, the Classic will detect and shut down
with an audible and visible alert to announce that there is a problem in the PV side of the system. A
manual reset is required after clearing the fault. Refer to the Classic charge controller manual for more
information.
Battery Combiner
Optional accessory
The MN Battery Combiner combines
battery banks for use with up to 4
Classic Charge Controllers and provides
a 1000 Amp / 100 mv shunt for precise
current measurement.
