Instructions / Assembly

MNPV6 Disco / -250 / AC Disco Installation Instructions Cont.
6 | P a g e 10- 1 8 3 - 1 R E V : B
Torque - Circuit Breaker
QY Circuit breakers 150 or 300 V 20 in-lbs (2.3Nm)
Important! Re-Torque to 20 in-lbs (2.3Nm) after 1 hour.
Torque – Terminal Bus Bar
10AWG 20 in-lbs (2.3Nm)
8AWG 25 in-lbs (2.8Nm)
6AWG 35 in-lbs (4.0Nm)
4AWG 45 in-lbs (5.1Nm)
2AWG – 1/0 50 in-lbs (5.6Nm)
Above right is a special configuration that is possible with the MidNite
Solar Classic charge controller. The MNPV6-250 Disco holds three 300VDC
breakers. 300VDC breakers take up two spaces. Here we have 3 strings of
10 130 watt panels for a total of 3900 watts. Note that PV input and
combined output are both wired to the top side of the breaker. Observe
polarity as noted above.
another combiner. Combiners can also be combined for additional power, so if more modules are added later, you
can simply add an additional combiner. When putting three 24 V modules in series you must pay attention to VOC
during cold spells so that you do not over voltage the controller. MidNite Solar breakers are rated for 150 and
300VDC. This configuration works very well especially when the array is far away from the battery bank. You can
sometimes save enough money on reduced wire size to pay for an MPPT charge controller. The following wiring
diagrams are intended to help you decide which type of combiner installation to do.
Above left: MNPV6 Disco wired with a split bus bar.
A basic wiring diagram is located inside the top cover of the
combiner. Additional wiring diagrams are available at
www.midnitesolar.com in AutoCad format.
These diagrams may be downloaded and modified to
represent a specific installation.