MidNite Solar MNKID-B User manual

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What does my kit come with?
1pc
MNKID-B
30-amp MPPT Charge
Controller
1pc
MNBIGBABY- 4 position
breaker box
2 pcs
MNEPV30- PV and battery
breaker
1 pc
GFP63 Ground Fault
Protection Breaker
2pcs each
Strain Relief wire
protectors/Conduit Adapters

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1 pc
MNBTS Battery Temperature
Sensor
1- 4 foot pc
Flexible Conduit
1 pc
MNSBB-W
Bus bar for PV negative with
white insulated standoffs
and mounting screws.
Red and black not included
with this kit
1 pc
MNSBBN
uninsulated ground bus bar
with mounting screws
2 pcs
5 feet of Red and 5 feet of
Black #10 THHN wire
1 pc
MNWRENCH
MNWRENCH for tightening strain reliefs

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What will I need?
Talk to your renewable energy supplier who will help you purchase the solar modules, module mounting
hardware and batteries appropriate for your needs. Then use the Midnite Solar KID Charging Kit to tie it all
together as a safe and reliable system.
Solar modules- what to buy
The KID is an MPPT "Maximum Power Point Tracking" charge controller. This type of controller optimizes the
match between the solar array (PV panels), and the battery bank. To put it simply, they convert a higher
voltage DC output from solar panels down to the lower voltage needed to charge the batteries. Because of
this your options for solar panels open up dramatically.
Solar modules- how much wattage can the Kid handle?
The Kid has a maximum output to the battery of 30 amps. Because the solar modules rarely produce their
rated wattage, it is common to oversize the array by 20% or so. The following wattage ratings are
approximations only and it is strongly recommended that you use the Kid string sizing tool found on the
Midnite Solar website at: http://www.midnitesolar.com/sizingTool_kid/index.php
•On a 12-volt battery the Kid can handle ~ 500 watts.
•On 24-volt battery the Kid can handle ~ 1000 watts.
On a 48 volt battery the Kid can handle ~ 1500 watts.
Tools needed-
Appropriate screwdrivers for connectors and mounting screws
Multimeter
Wire Stripper
Wire cutters
Hammer with a punch or screwdriver for removing knockouts
The Kid and Big Baby installation manuals (please read these!)
**SAFETY NOTICE**
DO NOT HOOK UP THE WIRES TO YOUR PV PANELS UNTIL THE REST OF THE WIRING IS DONE THIS WILL BE
THE LAST STEP IN YOUR ASSEMBLY. KEEPING ALL BREAKERS OFF IS ALSO RECOMMENDED

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Planning Ahead:
Things to consider when selecting a location for the BIG BABY and KID:
Length of wire- The longer the wire the more voltage drop (power loss) you will have. If you need to run a
long distance, it is recommended to use a larger size wire for that specific connection. The KID wall mount
terminals will hold a maximum wire size of #8, the internal terminals will accept a maximum wire size of #10.
If your wire run requires wire larger than #10, the best place to transition down to #10 is inside the Big Baby
Box. The circuit breakers can accept up to a #6 wire. There are several handy online wire sizing calculators
available. Here's one example:
http://www.calculator.net/voltage-drop-calculator.html
Environment- The BIG BABY and KID should both be mounted indoors or in a protected space. Neither of
them are intended for outdoor applications. You will be using flex conduit to protect the wires going from the
BIG BABY to the MNKID. If you plan on locating these two further away than 4 feet you will need to provide
your own conduit.
Ease of wiring- Think ahead on how each component will connect to the next. Allow ample room for routing
of wires and access to frequently accessed devices. We recommend placing the BIG BABY directly under the
MNKID.
Component Mounting- There are mounting holes in the back of the Big Baby and the KID has 4 mounting
holes located in each of the four outer corners of the plastic case. Please consult your KID manual or see
http://www.midnitesolar.com/pdfs/10-293-1_REV-E_KIDManual.pdf for additional instructions on how to
mount and set up the KID.
Installation:
Knockouts and Strain Reliefs
The Big Baby has knockouts at the top and bottom that you will need to remove to run your wires through.
Take a screwdriver or punch and place it on the outer edge of the circle you are knocking out, taking care to
avoid the small attaching points. To reduce the risk of bending the top and bottom of the Big Baby Box during
knock out removal, it is best to have the front cover installed for providing additional support.
(HINT) When removing the knockouts, make
sure to only remove the minimum amount
needed for the threaded portion of the strain
relief.
Gently tap on the screw driver or punch with a
hammer until the circle plug starts to bend
inward. Move to the opposite side of the circle
and do the same. Work the plug back and forth
until it comes loose. Once the knock out is
removed you can install the wiring Strain
Relief.

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Open the Big Baby by removing the 2 screws in the front. Remove the bottom nut from each strain relief and
insert them, with threads to the inside, through the top and bottom knock out holes. Firmly hand tighten the
nuts to secure the strain reliefs to the Big Baby. The Conduit adapter will go in the top of the BigBaby.
Installing the Negative Busbar

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All of your Negative wires will come to this busbar. To install it there are 2 screws in the KIT that will attach
the black mounting brackets to the BigBaby.
Big Baby Wiring
NOTE: Please consult your KID manual or see http://www.midnitesolar.com/pdfs/10-293-1_REV-
E_KIDManual.pdf for accessories that might need to be wired at this time such as ground wires, load and
load wiring, etc.
(HINT) Leave yourself some extra length of wire pulled into the Big Baby so you can make your connections
more easily. Once the wiring is complete, some of this excess can be pulled back out but be sure to leave a
small amount of slack inside the box to minimize strain on the connections.
Solar GFP and breaker wiring
Run the wires that come from your solar module through the bottom of the BigBaby. There are holes in the
Strain Relief for passing the wires through and into the box. If the fitment of the wires seems loose, you can
tighten the adjustment by twisting the top adjuster nut using an adjustable wrench or large pair of pliers.
You can run the wires to the solar modules, but do not make the final connections yet or you will be working
with live wires. Make sure all breakers are off.

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The breakers when installed should have the letters right side up and the breaker handles should be in the off
position.
(HINT) When stripping wire, it is recommended to only strip enough insulation off the wire to fit into your
connecter, approximately 3/8" for this breaker and for the negative busbar.
Why use Ground Fault Protection?
A Ground Fault Protection (GFP) will disconnect the solar array from the power system in the event of a
ground fault. This protects your equipment from the effects of a ground fault and is required by the
National Electric Code.

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Wiring the GFP-63 breaker
The positive PV wire connects to the bottom (the ++ end) of the MNDC-GFP63 breaker on the left-hand side.
From the top of the MNDC-GFP63 breaker on the left-hand side, the wire wraps around to the bottom of the
PV Breaker. The wire from the top of the PV breaker goes up to the PV + connecter in the KID.
The negative wire connects to the negative bus bar. Followed by the white wire from the MNDC-GFP63.

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Mounting the ground bus bar
At this time, you can install the non-insulated grounding bus bar in the mounting hole right next to where the
battery wires will come into. You will use the fastening hardware for this.
Note that the Green wire from the GFP -63 will go right into it. This also where the ground wire goes that is
connected to a ground rod or other approved grounding system.
Battery breaker wiring
The #10 AWG positive and negative wires from your battery should come into the bottom of the BigBaby via
the 2nd set of holes in the strain relief. The positive wire connects to the bottom (the ++ end) of the
MNEPV30 breaker. The negative wire connects to the negative bus bar.

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Estimate the length of wire needed to go from the Big Baby to the KID terminal block. Cut and install two #10
negative wires of appropriate length to the negative bus bar, then two #10 positive wires to the top of the
two breakers (the - - end). Pass all four wires out of the top strain relief. Connect your Earth ground wire to
the Ground busbar and run that out the top of the KID with the other four wires.
Run all five wires through the conduit tubing.
Important: The circuit breaker torque value is 20 inch-pounds
(2.3NM). You should tighten to this specification during installation
and again one hour after the installation is powered up. Do not
omit the second tightening! A loose wire can cause arcing, melting
of bus bars and fire.
Once the conduit adapter is in place on the BabyBox and the Kid
you can connect the flex conduit to them. Twisting clockwise while
pushing onto the end of the adapter will tighten it.
(HINT) The warmer the conduit the more flexible it is. If you find
that you can’t get it over the top of the adapter heating it up with a
hair dryer or hot air gun will help.

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Marking your wires is ALWAYS a good idea
Wiring the KID Controller
To make the final connections to the KID, take the two solar wires coming from the top of the Big Baby and
pass them through conduit and connect them to the PV Plus and PV Minus terminals. Pass the two remaining
battery wires from the Big Baby through the conduit and connect them to the Battery Plus and Battery Minus
terminals. When making the KID connections, polarity matters. Connect the Ground wire to the ground lug
on the KID (see KID manual for this step)

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Do NOT make the final connection to your battery terminals at this time or you will be working with live
wires!
We recommend installing the MNKID at the highest point in your installation. Since the wiring comes out
the bottom of the MNKID, it is easier to run the conduit straight down to the BIG BABY.
The mounting bracket for the MNKID has a plastic knock out on the bottom right hand side. It is much easier
to remove than the one for the BIG BABY. There is a hole plug in the KID that looks like this:
It will go in the right-hand side knock out in the KID to allow your use of the Temperature Sensor unit:

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Please see http://www.midnitesolar.com/pdfs/Kid-Manual-1797-REV-E.pdf for Startup procedures and other
accessories that might need to be wired at this time such as Ground wires, AUX controls, battery
temperature sensors, etc.
Once you are sure that your wiring is completed, your polarity is correct, and your settings are correct, you
are ready to power everything up:
1. Make sure your breakers in the BIG BABY are off
2. Make the final connections to your battery terminals
3. Make the final connections to your solar modules
4. Using the multimeter, verify proper polarity and expected voltage between the bottom of the two
circuit breakers and the negative bus bar.
5. Turn on the battery breaker first. You should see the display panel light up and LEDs flashing.
6. Enter your battery and other programming. Read the Kid manual for set up procedures.
7. Once the Kid is operating as expected and the setup procedure is complete, the GFP and solar
breakers can be turned on.
Your system is now active. You can finish installing any front covers or protective measures that might be
needed.
For warranty information please refer to the manuals that came with your equipment. Save all the manuals
that came with your equipment and keep them in a system folder. They tend to come in handy at times!
For support for all Midnite Solar Products:
By phone: [phone]
By email: supp[email protected]om
Support ticket system: http://www.midnitehelp.com/
Midnite Solar, Inc.
17722 67th Ave. NE
Arlington, WA 98223

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