MNDC Instruction Manual

ManualsBrandsMidNite Solar ManualsElectrical DisconnectsMini DC Disconnect

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:

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

 Hinged door for easy access to electrical circuits

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

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

 Ground bus bar with 14 poles

 Six mounting spots for 500 amp, 50mV shunt

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

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

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

Summary of content (9 pages)

PAGE 1
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:  Aluminum chassis.
PAGE 2
MNDC Instructions (continued) IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS - These instructions contain important safety and operating instructions for the MidNite Solar DC Disconnect models MNDC125, MNDC175 and MNDC250 for residential and commercial applications. If you do not fully understand any of the concepts, terminology, or hazards outlined in these instructions, please refer installation to a qualified dealer, electrician or installer.
PAGE 3
MNDC Instructions (continued) 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 4
MNDC Instructions (continued) 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 surge suppressors like the MNSPD get grounded.
PAGE 5
MNDC Instructions (continued) Battery Positive connections DC positive from the battery bank connects to the lower section of the large DC inverter breaker. The lower inverter breaker stud is also the common point for connection of additional DC circuits such as from the output of a charge controller. Do not connect other charging sources to the top of the inverter breaker as this would apply power to the inverter even when the inverter breaker is turned off.
PAGE 6
MNDC Instructions (continued) 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 There are three 2” conduit knock outs for inverter wire exit. Carefully analyze the possible wire exit paths to the inverter.
PAGE 7
MNDC Instructions (continued) 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. Lay the cover plate on a flat scrap wood surface and using a flat screw driver blade and hammer cut the tabs.
PAGE 8
MNDC Instructions (continued) Need more help? Want to watch someone install one? MidNite Solar’s PowerTime videos can amuse and enlighten. http://www.midnitesolar.com/videoDisplay.php MNDC fully wired Are you protected from surges? The MidNite Solar Surge Protector Device (MNSPD) is a Type 2 device per UL1449 rev3. It is designed for both AC and DC systems and provides protection to service panels, load centers or where the SPD is directly connected to the electronic device requiring protection.
PAGE 9
MNDC Instructions (continued) MIDNITE SOLAR INC. LIMITED WARRANTY MidNite Solar Power electronics, sheet metal enclosures and accessories MidNite Solar Inc. warrants to the original customer that its products shall be free from defects in materials and workmanship. This warranty will be valid for a period of five (5) years for all products except the MNKID Charge Controller which will be two (2) years.