Installation manual and specs

ManualsBrandsMidNite Solar ManualsDisconnectMidNite Solar MNDC175

14000 Burn Rd

Arlington, WA 98223

USA

Ph (425)374-9060

www.midnitesolar.com

MNDC Instructions

Rev: New Page 1 of 7

Model: MNDC125, MNDC175, MNDC250

Shown with 250 amp sized breaker MNDC closed

The Mini-DC was designed to take into account many different types of renewable energy

installations. These installation instructions will describe and show some of the more common

possibilities.

Features:

x Aluminum chassis. (no rust in the tropics or around salt water)

x Hinged door for easy access to electrical circuits

x Inverter breaker included (125, 175 or 250 amp)

x Din rail for DC circuits such as PV in, Chg Cntrl out, DC-GFP, DC loads, PV combiner

x Ground bus bar with 14 poles

x Six mounting spots for 500 amp, 50mV shunt

x Mounting spot for insulated bus bar (for PV negative connection point)

x Knock outs for inverter and battery cables, charge control mounting, DC & PV in & out

x 5/16” diameter stud for battery negative tie point

Summary of content (7 pages)

PAGE 1
4000 Burn Rd Arlington, WA 98223 USA Ph (425)374-9060 www.midnitesolar.com MNDC Instructions Model: MNDC125, MNDC175, MNDC250 Shown with 250 amp sized breaker MNDC closed The Mini-DC was designed to take into account many different types of renewable energy installations. These installation instructions will describe and show some of the more common possibilities. Features: x Aluminum chassis.
PAGE 2
MNDC Installation Instructions Dimensioned drawing showing conduit locations and sizes Top view showing three 1” knockouts. The left two knockouts fit charge controllers such as the Classic, MX60, C-40 and Tristar controllers The left side of the MNDC chassis has three 2” knockouts and two ½” knockouts. The 2” knockouts are intended for inverter DC cables. If installing to a Trace or Xantrex SW inverter, use a 2” offset nipple to attach to the SWCB conduit box.
PAGE 3
MNDC Installation Instructions Wiring diagram supplied on the door of MNDC Grounding There are various ground circuits that need to be considered in the renewable energy system. The MNDC chassis should be grounded to your earth ground rod through a 6AWG wire connected to the ground bus bar located in the top left section of the MNDC chassis. The MNDC ground bus bar will then become your primary system DC ground. The ground bus bar is also where DC lightning arrestors get grounded.
PAGE 4
MNDC Installation Instructions Battery Negative connection The wiring diagram shows a 500 amp shunt. This is used to measure voltage drop across the shunt to aid in calculating battery state of charge. The shunt does not ground the battery negative circuit. If this shunt is not installed, then you may use the 5/16” stud directly above the shunt area as a battery negative tie point. Using this tie point will ground the battery negative to the chassis.
PAGE 5
MNDC Installation Instructions Note the 6AWG wire connected to the lower section of the inverter battery breaker. This comes from the output breaker from a charge controller. The inverter negative shunt connection has the corresponding negative circuit from the charge controller and negative from the DC-GFP. Battery Positive connections and shunt wiring Wire exit to inverter There are three 2” conduit knock outs for inverter wire exit. Carefully analyze the possible wire exit paths to the inverter.
PAGE 6
MNDC Installation Instructions Remove the DC breaker cover to install din rail mount breakers. Insure the yellow tab snaps into place to secure the breakers. Strip wires 3/8” and bend at ¾” from end. This section is very tight so pay close attention to wire routing. Use cable ties to secure wires in a neatly routed bundle. Lat the cover plate on a flat scrap wood surface and using a flat screw driver blade and hammer, cut the tabs.
PAGE 7
MNDC Installation Instructions MNDC fully wired Rev: New Page 7 of 7