1. Packing List
The box should include all items shown in the component guide. If there is damage or missing parts, immediately call the phone number (USA) (360)-403-7207.
Component Illustrations:
Component A: Inverter unit.
Component B: Mounting Bracket.
Component C: File Package.
Component D: Meter (Optional).
Component E: CT (Current Transformer) sensors.
Component F: M6 Self-tapping Screw.
Component G: M6 Security Screw.
Component H: WiFi/Ethernet Dangle.
Component I: Bushing Rings (φ67.5mm and φ49mm).
Component J: Toroid (φ53mm for Battery and φ30mm for Ground of Grid).
Component K: Gutter Template.
| Component | Description | Quantity |
|---|---|---|
| A | Inverter | 1 |
| B | Mounting Bracket | 1 |
| C | File Package | 1 |
| D | Meter (Optional) | 1 |
| E | CT | 2 |
| F | M6 Self-tapping Screw | 4 |
| G | M6 Security Screw | 1 |
| H | WiFi/Ethernet Dangle | 1 |
| I | Bushing Ring (φ67.5mm & φ49mm) | φ67.5mm: 3, φ49mm: 6 |
| J | Toroid (φ53mm(Battery) & φ30mm(Ground of Grid)) | 2 |
| K | Gutter Template | 1 |
1.1 General Description
The MidNite MN 15-12KW-AIO is an All-in-One Inverter/Charger System. The unit features various connection points and components:
- A: PV switch.
- B: LED screen.
- C: 300 amp Hydraulic/magnetic Bat breaker.
- D: Three 15A & one 20A 120VAC Load breakers.
- E: 120/240VAC Smart load breakers (60A+30A+50A) or 60A Gen input + 30A Smart Load + 50A AC coupling. Each dual breaker can be used as a load or input and programmed accordingly.
- F: 100A 120/240VAC AC OUT.
- G: 100A 120/240VAC AC IN.
- H: ON/OFF Button.
- I: LCD screen.
- J: Wi-Fi / Ethernet dongle.
- K: 5/16-18UNC Battery connection terminals.
- L: PV connection terminal block.
- M: NEUTRAL Busbar.
- N: Communication connection ports (RS485, BMS, DRM, CT, DRY, RSD, PARA).
- O: GROUND Busbar.
The diagram shows the layout of these components and connection terminals for PV input, battery connections, load outputs, AC input/output, generator input, and communication ports.
1.2 Specifications
The system has specific dimensions and torque requirements for connections.
Dimensions:
- Overall Height: 37.40" (950.0mm)
- Overall Width: 16.54" (420.0mm)
- Depth (front to back): 10.11" (256.8mm)
- Side View Dimensions: 9.52" (241.8mm) height, 13.32" (338.4mm) width.
- Front View Dimensions: 17.32" (440.0mm) width, 9.06" (230.0mm) height.
- Mounting hole diameter: 6 x Φ1.75" (Φ44.45mm), 3 x Φ2.50" (Φ63.4mm).
Torque Specifications:
| Terminal | Torque [in-lb] | Torque [Nm] |
|---|---|---|
| LOAD(#1/#2/#3/#4) | 20 in-lb | 2.5 Nm |
| Smart loads breaker/Gen input/AC coupling | 20 in-lb | 2.5 Nm |
| AC out | 35 in-lb | 4 Nm |
| Neutral / Ground (Busbar) | 50 in-lb (7/16-20 UNF) / 26 in-lb (1/4-28 UNF) | 5.6 Nm (7/16-20 UNF) / 2.9 Nm (1/4-28 UNF) |
| AC Input Grid | 35 in-lb | 4 Nm |
| Battery Connection | 126 in-lb | 15 Nm |
1.3 Wire Gauge Guide
Proper wire gauge selection is crucial for safe and efficient operation, adhering to local electrical codes.
1. AC Input/Outputs:
- “AC INPUT GRID” Terminal: 100A MAX passthrough, requires 2 AWG conductor.
- “AC OUTPUT” Terminal: 100A MAX passthrough, requires 2 AWG conductor.
- Note: While a backed-up sub-panel may have over 100 amps of load circuits, the utility pass-through current is limited to 100 amps continuous per leg. The inverter output current when inverting is limited to 47.5 amps continuous per leg.
2. SENSORS CT: 16.40 ft [5 m] included.
3. BATTERY CABLES: 4/0 AWG THHN recommended. Max Charge and Discharge limited to 260A.
Wire Gauge Illustrations:
- Batteries: 4/0 AWG conductor with 5/16"-18UNC terminal.
- PV Conductors: 8 AWG conductor, with a diameter of approximately 0.59" (15mm) at the terminal.
- AC Conductors: 2 AWG conductor, with a diameter of approximately 0.59" (15mm) at the terminal.
- Ground: 8/10 AWG conductor, with a diameter of approximately 0.59" (15mm) at the terminal.
CT Sensors: The diagram shows two CT sensors (CT1 and CT2) with connections for RS485 and CT terminals. The CT sensors are typically 0.94" (24mm) in diameter.
Ground Toroid (30mm): The ground cable of the Grid needs to be wrapped around the toroid twice for EMI suppression, as illustrated.
2. Installation
2.1 Mounting the MN 15-12KW-AIO
Mounting Considerations:
- The system weight is 101.85 lb (46.2 Kg).
- Ensure at least 6 inches (15 cm) of vertical clearance around the inverter for proper heat dissipation. Heat transfer and cooling occur from bottom to top.
- The enclosure is NEMA 3R - IP65 rated, suitable for outdoor installation but can also be installed indoors.
- Protect the LCD screen from direct exposure to UV light.
- Mount the inverter ensuring it is level and properly seated.
- Securely attach the inverter to the mounting surface using appropriate anchors for the wall material (e.g., expansion plugs for concrete). Calculate support needed for the equipment's weight.
- Remove the sticker on the bottom of the equipment before mounting. Use the provided gutter template to mark the installation location on the wire guard.
- Knockout holes may require bushing rings as needed.
Mounting Orientation: The inverter can be mounted upright (90°), leaned back up to 15°, horizontally, or upside-down. The upright orientation is recommended.
2.2 Connecting PV Modules
The inverter features 3 independent MPPTs, each capable of handling up to 2 PV strings. Each MPPT can operate at a current of 30A/22A/22A (self-limiting) with a maximum Voc of 600V.
PV String Connection Options:
- Combiner Box: A combiner like the MNPV3 can be used to combine strings externally before connecting to the MPPT. The diagram shows strings PV1A and PV1B connected via a combiner to the MPPT.
- Individual Strings: Strings can be connected directly to the MPPT using Y-connectors or individual connections. The diagram shows individual strings PV1A and PV1B connected to the MPPT.
2.3 Integrating Batteries
Battery Toroid: Install the provided battery toroid on the battery input wires. Both the Battery (+) and (-) cables must pass through the toroid simultaneously. These toroids are for EMI suppression.
2.4 BMS Port (CAN/RS485, Only for Lithium Battery)
The inverter includes several communication ports:
- BTS: Battery temperature sensor (not polarity sensitive), used for voltage compensation for Lead Acid batteries (e.g., MidNite MNBTS).
- RSD: Normally open dry contact for EPO (emergency power off). It is Sunspec compatible.
- DRY: Generator control, Remote off control, DI/DO control. Includes a normally open relay for generator two-wire start (terminals 1,2) and DI/DO control (terminals 3,4,5,6) programmable via the App. Remote off control is on terminal 7. Temperature sensor terminal for lead-acid battery is on terminals 8,+9.
- CT/METER: For CT/Meter communication or Grid current sense.
- BMS: Lithium battery communication interface.
- PARA: Parallel communication, requiring a matched resistance switch for parallel communication.
- RS485: For RS485 communication.
The manual illustrates the pinout sequence of the BMS at the INVERTER SIDE. A table details the pin assignments for RS485 and CAN communication.
| Pin | RS485 | CAN |
|---|---|---|
| 1 | RS485_A | -- |
| 2 | RS485_B | -- |
| 3 | GND_S | GND_S |
| 4 | -- | CAN_H |
| 5 | -- | CAN_L |
| 6 | GND_S | GND_S |
| 7 | GND_S | GND_S |
| 8 | GND_S | GND_S |
A diagram shows the BMS (CAN&RS485) connection and the communication lines (CAN_H, CAN_L) between the Inverter and Battery.
2.5 Wi-Fi / Ethernet Antenna (Dongle)
The Wi-Fi/Ethernet antenna (dongle) can be installed by unscrewing and removing the cover, then installing the module. The diagram shows these steps. For details, refer to the corresponding Module Installation Guide.
2.6 Limit Sensors (CT/Meter)
CT Sensors for Stand-alone application (120V/240V Split phase): Each inverter includes two CT sensors. The diagram shows the wiring for CT1 and CT2, including connections for RS485 and CT terminals.
| Pin | Function Description |
|---|---|
| 1 | -- |
| 2 | -- |
| 3 | RS485_A |
| 4 | RS485_B |
| 5 | CT2- |
| 6 | CT2+ |
| 7 | CT1+ |
| 8 | CT1- |
CT+Meter for Parallel Systems (120V/240V Split phase): CT+meter sensors are essential for stacking and highly recommended for multi-system installs. Contact sales at 360-403-7207 to purchase the meter and bigger CT. The diagram shows connections for CT1, CT2, and the Meter (DTSU666) with RS485 communication.
CT+Meter for Parallel Systems (120V/208V Three-Phase): This system requires three CTs and 1 meter. Contact sales at 360-403-7207 for purchase. The diagram shows connections for CT1, CT2, CT3, and the Meter (DTSU666) with RS485 communication.
2.7 Parallel Communication
For parallel connection mode, it is necessary to turn the matched resistance switch of the first and last inverter to “ON”. The diagram illustrates the switch setting and wiring for parallel communication using the PARA port (CAN_L, CAN_H).
2.8 Power ON MIDNITE MN 15-12KW-AIO
Follow these steps to power on the system:
- Power on the PV.
- Power on the battery via the battery breaker and any external battery switches or breakers.
- Power on the AC IN GRID breaker.
- Connect the cell phone App via Bluetooth. Click “Power ON” in the App for the first time. For subsequent startups, you can hold the ON/OFF button on the inverter for 5 seconds. (Refer to app instructions for details).
- Power on the AC OUT breaker.
- Power on the SMART LOAD breakers.
- Wait approximately 5 minutes for the inverter to start and perform system checks.
- If changing modes or smart load settings, put the inverter in standby and wait 5 minutes before restarting.
- If an error is identified, clear the error and wait 5 minutes to restart.
The diagram illustrates the sequence of powering on breakers for PV, Battery, AC Input Grid, AC Out, and Smart Load, along with the first-time vs. non-first-time app/button press for power-on.
2.9 Power Off Sequence
Follow these steps to power off the system:
- Power off the AC OUT breaker.
- Power off the SMART LOAD breakers.
- Connect the cell phone App via Bluetooth and click “Power OFF” on the App. Alternatively, hold the ON/OFF button on the inverter for 5 seconds for subsequent shutdowns.
- Power off the AC IN GRID breaker.
- Power off the battery from the battery breaker and any external battery switches or breakers.
- Power off the PV.
- To disconnect inverter cables, wait at least 5 minutes before touching them.
The diagram illustrates the sequence of powering off breakers for AC Out, Smart Load, AC Input Grid, Battery, and PV, along with the app/button press for power-off.
3. App Setting Guide
Download App for Local Setting
Scan the QR code provided or download the MidNite Pro app from the App Store or Google Play.
Access Permission
Before using local settings, grant the app necessary permissions when prompted during installation or via phone settings.
Connect Inverter
Open the Bluetooth on your phone and launch the MidNite app. Connect to the inverter by selecting its name from the list of scanned devices.
3.1 Installer Login
Select the installer role (Installer or End User) and enter the password to log in. The diagram shows the login screens for role selection and password entry.
3.2 Stored Energy
This section guides users on setting the work mode, disabling the Zero Export button (if selling back to the grid), and configuring related battery parameters. The screenshots show navigation through the app's settings menu to access 'Stored energy' and 'Set the parameters'.
3.2.1 Work Mode: Self Consumption
Select 'Self Consumption' as the work mode in the 'Storage' settings.
3.2.2 Work Mode: Grid Feed in priority(Sell to grid)
Select 'Grid Feed in priority(Sell to grid)' as the work mode in the 'Storage' settings.
3.2.3 Work Mode: Off Grid
Select 'Off Grid' as the work mode in the 'Storage' settings.
3.3 Communication
Connect the inverter to your router by configuring the Wi-Fi settings within the app's 'Communication' menu.
3.4 Grid
Set the grid parameters, including the grid standard code, maximum input power from the grid, start-up time and power ramp-up rate, and frequency protection parameters (Low LV_1, High LV_1).
3.5 Power Control
Configure power control parameters such as energy flow directions, power derating control method, maximum feed-in grid power, and maximum permitted consumption from the grid.
3.6 Equipment Maintenance
Synchronize the device's date and time with your phone by clicking the 'Sync Time' button. You can also view basic information (device model, versions, serial number), view main parameters, view device logs, clear all data (use with caution), and perform maintenance operations like resetting the device to factory condition (shut down before operation) or turning the device on/off.
4. Wiring Diagrams
These wiring diagrams are examples for common inverter installations and must meet local electrical codes and jurisdiction requirements.
Diagram 01: Standard Wiring Diagram (Single Inverter)
This diagram illustrates the connections for a single MidNite MN 15-12KW-AIO inverter. It shows:
- PV Array Connections: PV+ and PV- terminals.
- Battery Connections: BAT+ and BAT- terminals, with a diagram for 48Vdc Lithium battery/lead-acid battery.
- AC Connections: AC INPUT GRID (L1, L2, Neutral, Ground), AC OUT (L1, L2, Neutral, Ground), Generator Input (L1, L2, Neutral, Ground), and Load connections (#1, #2, #3, #4).
- Communication Ports: BMS Communication Cable, CT/Meter Communication Cable, DRY, CT/Meter, BMS, RS485, RSD, PARA ports.
- Internal Components: PV switch, breakers for battery, loads, AC input/output, and DIP switches.
- CT Sensors: CT1 and CT2 connections.
- Tables: Table 1 lists Breaker Specifications for different locations (Battery, GEN, Loads, AC). Table 2 provides the Wire Gauge Guide (Copper) for conductors (A, B, C).
- Symbols: Standard symbols for common neutral/ground connections are used.
Diagram 02: Standard Wiring Diagram - Parallel Inverters (2 to N)
This diagram illustrates the wiring for parallel connection of 2 to N MidNite MN 15-12KW-AIO inverters (120/240V). It shows:
- Multiple inverters connected in parallel, sharing PV arrays, battery banks, and AC grid/load connections.
- Each inverter has its own PV, battery, AC, and communication connections.
- BMS Communication Cable connecting each inverter to the BMS.
- CT sensors and a meter for monitoring.
- Parallel communication (PARA) connections between inverters.
- DIP switches for parallel configuration.
- Tables: Similar to Diagram 01, it references Table 1 for Breaker Specifications and Table 2 for Wire Gauge Guide.
- Note: BMS is only for lithium batteries. Each inverter should be connected to the BMS COM cable when using standalone lithium battery connections. The arrow indicates current flow in the CT from the grid to the inverter.
