AC Coupling Grid-Tied Backup

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MNSI6048-ACCPL SMA AC Coupled Backup Inverter

home backup
  • SMA AC Coupling Power Center
  • emergency
  • SMA / MidNite Solar AC coupled solutions for existing string (central inverter) or microinverters. The system is shipped pre-wired ready to install. The package includes a line drawing showing how to wire the system to your home or business. An automatic transfer to a generator option is also available. This is a self-contained prewired AC coupled system complete with a Sunny Island SI 6048 120VAC 60 Hz inverter, master 250 amp MidNite Solar E-Panel with triple relay module, MNX-240 6,000 watt autoformer and lightning arrestor to protect the circuitry. AC coupling can be used in grid tied, grid interactive as well as off-grid applications.
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AC Coupled Battery Based Grid Tie Backup System

Model Item Code # Solar Panels Pass-Through
Rating
Peak AC Surge Battery Storage Power Supply Shipping Weight
MNSI6048-ACCPL 03304321 None 56 Amps 11,000W Batteries Not Included Solar / Grid 375 LBS
ac coupled

The MidNite MNSI6048-ACCPL SMA AC Coupled Kit is built using the SMA Sunny Island battery-based inverter which is used with the MidNite AC-coupled load center and includes the Autoformer platform architecture. This system can be retrofitted to an existing Sunny Boy grid-tied system, or many other grid-tie inverter systems, for battery backup power during an outage. It comes with 120/240 VAC output and grid connection. During normal grid-tie operation, the autoformer is disconnected and not drawing power. Includes a Sunny Island SI6000-US, MidNite E-Panel, MidNite Autoformer, all on a mounting plate, and is fully assembled and tested. 66”W x 24”H x 12”D.

UL 1741 islanding protection - In the event of a grid blackout, it is required that any grid-interactive inverter automatically turn off. This prevents the inverters from continuing to feed electricity into the grid near the home, known as "islands". Electrical islands present a risk to utility workers who may expect the area to be unpowered. The SMA/MS AC coupled architecture has built into the E-Panel a grid-active relay to automatically disconnect the system from the utility power during blackouts. When the grid comes backup, the system is automatically reconnected to the grid.

SMA / MidNite ac-coupled solutions are built with MidNite E-Panel load centes. The Sunny Island is equipped with sophisticated ac grid-management functions and highly developed battery management that includes full system monitoring. The Sunny Island continuously tracks the batteries’ state of charge, and as system manager makes ongoing decisions based on those states. For example, during operational periods where the battery are discharged and there is little solar generation, the Sunny Island can remotely and automatically start a backup generator, or even switch off consumer loads using a built-in load-shedding relay parameter. The Sunny Island also determines the optimum strategy for charging the batteries and in doing so increases their service life.

The single inverter systems come pre-wired with a 6,000 watt MidNite Autoformer which is not needed for the dual Sunny Island systems. The toroidal design assures minimal magnetic stray field leakage, and, because of its 98% high efficiency, a very compact size for its rating.

ac coupled

The systems architecture continues with the SMA Sunny Island SI6048-US 6kW inverter. SMA Sunny Island inverters are highly advanced with peak efficiencies above 95% and surge-protection for starting large loads such as motors, deep well pumps and most household and shop equipment you may choose to add later down the road. For example, the Sunny Island 6048-US model, which is standard, can provide 7 kW output for 30 minutes, 8.4 kW for 1 minute and 11 kW for 30 seconds. Sunny Island inverters systems by themselves have single phase 120 VAC output but are 240 VAC when stacked.

SMA, the oldest and most experienced inverter manufacture in the world, begin developing AC coupled systems beginning with its Sunny Island product in the 1990’s. AC coupling uses micro or string grid-tied inverters which allow electricity generated by solar panels to be NET metered which means it flows in both directions. One of the great things about AC coupling is you can either add the battery based backup to a home with or without existing solar panels. The architecture of the system is flexible enough to add future modules and battery storage although batteries should be installed as a matched string from the onset. SMA products are unique in the inverter world because the Sunny Island and Sunny Boy communicate with each other to insure proper battery charging during a power outage. No other inverter combination can claim this. If the batteries are fully charged, the Sunny Island will instruct the SMA Sunny Boy Inverter to derate their power output to regulate the deep cycle battery charge. SMA America asked MidNite Solar to design an integrated plug-n-play pre-wired E-Panel system to use with the Sunny Island inverter. The top matching color NEMA box houses the autoformer. SMA Sunny Island is sandwiched between the MidNite Solar autotransformer box and the MidNite Solar E-Panel below the Sunny Island; the complete system comes pre-wired mounted on a long back plate.

Works with up to 12KW of Sunny Boy grid tie inverters or 6KW of other manufacturers grid tied inverter. The system limitation to interface with a solar array is 12 kW or a 2-1 ratio. When the grid is available, the potential for 12kw to pass through the Sunny Island 56 amp 120 volt relay is limited to its 6720 watt rating. When the grid is down, the SMA backup can take up to 2x the size of the Sunny Island/s for a limit of about 12kw. This limitation exists due to being able to regulate battery voltage by having the Sunny Island shift frequency which controlls the inverter AC input.

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What's On The Truck

  • 1 - MidNite, SMA MNSI6048-ACCPL w/Sunny Island SI6048, Pre-wired Power Center, AC-coupled, 6.0kW, 48VDC, 120/240 VAC, INCLUDES:
  • 1 - MNE250SMA E-Panel
  • 1 - AC Bypass Assembly
  • 2 - MNSPD300’s (Surge Protection Devices)
  • 1 - 250 amp Battery Main Breaker for the Sunny Islands
  • 1 Line Drawing

sma ac coupledPower Center ships via freight as shown on pallet in 10 business days after funds clear. (Subject to Seasonal Increases) Custom Line Drawing is sent via email in 5 - 7 business days.

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Options & Accessories Part # Price  
MidNite Solar MNBE8D2/2 Enclosure w/ 4 FullRiver AGM DC260-12V Batteries Includes Cables; 12,480 Watt Energy Storage BPMNDC26012inverter cable
Qty
Technical Data Sunny Island
4548-US
Sunny Island
6048-US
AC output (loads))))    
Rated grid voltage / AC voltage range 120 V (105 V – 132 V) 120 V (105 V – 132 V)
Rated frequency / frequency range (adjustable) 60 Hz (55 Hz - 65 Hz) 60 Hz (55 Hz - 65 Hz)
AC power at 25 °C / 40 °C for 3 hours 5000 W / 4000 W 6000 W / 5000 W
Rated power (@U(nom), f(nom) / 25 °C / cos f = 1) 4500 W 5750 W
AC output power at 3 s 25 °C (77 °F) for 30 min / 1 min / 5300 W / 8400 W / 11000 W 7000 W / 8400 W / 11000 W
Rated current / Max. output current (peak) 37.5 A / 180 A for approx. 60 ms 48 A / 180 A for approx. 60 ms
Total harmonic factor output voltage / power factor at rated power 3% / -1 ... +1 3% / -1 ... +1
     
AC input (PV array or grid))    
Rated input voltage / AC input voltage range 120 V (80 V – 150 V) 120 V (80 V – 150 V)
Rated input frequency / allowable input frequency range 60 Hz / 54 Hz ... 66 Hz 60 Hz / 54 Hz ... 66 Hz
Max. AC input current / adjustable 56 A / 0 A ... 56 A 56 A / 0 A ... 56 A
Max. AC input power 6.7 kW 6.7 kW
     
Battery DC inputt    
Rated input voltage / DC voltage range 48 V / 41 V - 63 V 48 V / 41 V - 63 V
Max. battery charging current / DC rated charging current 100 A / 85 A 130 A / 110 A
Battery type / battery capacity range Lead, NiCd / 100 Ah - 10000 Ah Lead, NiCd / 100 Ah - 10000 Ah
Charge control IUoU charge procedure with automatic full charge and equalization charge IUoU charge procedure with automatic full charge and equalization charge
     
Efficiency / self-consumptionn    
Max. efficiency / CEC efficiency 96% / 94.5% 96% / 94%
Self consumption with no load / standby 25 W / 4 W 25 W / 4 W
     
Protective Devicess    
DC reverse polarity protection / DC fuse yes/yes yes/yes
AC short-circuit / AC overload yes/yes yes/yes
Overtemperature / battery deep discharge yes/yes yes/yes
     
General dataa    
Dimensions (W/H/D) 467/612/235 mm (18.4/24.1/9.3 inch) 467/612/235 mm (18.4/24.1/9.3 inch
Weight 63 kg /139 lb 63 kg /139 lb
Operating temperature range –25 °C ... +60 °C (–13 ° F ... +122 °F) –25 °C ... +60 °C (–13 ° F ... +122 °F)
     
Features / functionn    
Operation and display / multi-function relay Internal/2 Internal/2
Degree of protection (according to IEC 60529) internal assembly (NEMA 1) internal assembly (NEMA 1)
Three-phase systems/parallel connection yes/yes yes/yes
Integrated bypass/multicluster operation no/yes no/yes
State of charge calculation/full charge / equalization charge yes/yes/yes yes/yes/yes
Integrated soft start/generator support yes/yes yes/yes
Battery temperature sensor/data cable yes/yes yes/yes
Warranty: 5/10/15/20 years yes/opt./opt./opt./opt. yes/opt./opt./opt./opt.
Certificates and approvals www.SMA-Solar.com www.SMA-Solar.com
Accessories    
Battery cables/battery fuse opt./opt. opt./opt.
Interfaces (RS485/Multicluster PB) opt./opt. opt./opt.
Extended generator start "GenMan" opt. opt.
Load-shedding contactors/external battery current measurement opt./opt. opt./opt.
     
Type designation SI4548-US-10 SI6048-US-10

Midnite MNSI6048-ACCPL SMA AC Coupled; Related Documents & Manuals

 
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Midnite MNSI6048-ACCPL SMA AC Coupled KitBattery Based Grid-Tied or Off-Grid Backup Power Center

Midnite MNSI6048-ACCPL SMA AC Coupled Kit is built with a SMA bi-directional battery-based inverter / charger that can be used completely off-grid, or for battery backup in grid-tie systems. The Sunny Island MidNite Solar combination is a complete high efficiency pre-wired power center all in a compact wall-mounted package. It includes 6kW of pure sine wave output power, low idle losses, and a 100 A battery charger, and offers an integrated data monitoring system with battery disconnect.

Grid-Tie System Backup - The Midnite MNSI6048-ACCPL SMA AC Coupled Kit can provide back-up power for critical loads during utility grid blackouts. Combined with any grid-tie inverter system and a bank of batteries, the AC-coupled system will enable the solar array to power loads and charge the batteries. As an "AC-Coupled" system, the AC output of Sunny Boy grid-tie inverter is connected to a critical-loads subpanel rather than the main panel. The subpanel is also connected to the AC output of one or more Sunny Island inverters. Under normal conditions, the power from the solar array and the Sunny Boy inverters passes through the subpanel and the Sunny Island's built-in transfer switch on its way to the grid, without loss of efficiency. Likewise, grid power can pass the other direction when needed. During a power outage, the Sunny Island isolates itself from the grid and provides AC power to the emergency subpanel, drawing energy from the battery bank. The grid-tie Sunny Boy inverter will shut down during a blackout, but will turn back on (after a 5-minute period) when AC power from the Sunny Island is present. AC power from the Sunny Boy inverter(s) can be used by the Sunny Island to charge the batteries. If the batteries are full, and the solar system is producing more power than the loads require, the Sunny Island will communicate with the Sunny Boy inverter to decrease its power output. If there are no loads and the batteries are full, the Sunny Boy inverter will automatically shut off to prevent battery over-charging.

Off-Grid Power - In off-grid systems, the Sunny Island works with Sunny Boy inverters exactly as it does with grid-tie systems during a grid outage. A generator can be connected to the Sunny Island's AC input to provide back-up and battery charging. The battery bank can also be charged using a solar array with a standard PWM or MPPT charge controller, or by other power sources like microhydro and wind turbines. Data Monitoring The Sunny Island utilizes removable SD cards to store performance data from the integrated data logger and to perform firmware upgrades. State-of-charge metering helps with battery management to ensure maximum battery life. The Sunny Island Sunny Island MNSMA1 AC Coupling Kit works with the SMA Sunny WebBox and SensorBox monitoring accessories. The Sunny Island SI6048-US is Listed to UL 1741 for the U.S. and Canada and carries a 5-year warranty expandable up to 20 years.

midniteIMPORTANT SAFETY INSTRUCTIONS: It is the responsibility of the purchaser to ensure that all products are installed and operated in accordance with local and national building codes as specific by the NEC (National Electric Code), UBC (Uniform Building Code) or IBC (International Building Code) and local utility company policy. This product is designed for indoor or protected compartment installations. DO NOT expose the inverter to rain, snow, moisture or liquids of any type. Use insulated tools to reduce the chance of electrical shock or accidental short circuits. Remove all jewelry such as rings, watches, bracelets, etc. when installing the power center or any other electronic gear. Always disconnect the batteries or energy source prior to installation or performing maintenance on the inverter. Live power may be present at more than one point since an inverter utilizes both batteries and AC electricity. Turning off the inverter may not reduce that risk. Always verify proper wiring prior to starting the inverter. Do not operate the inverter if it has been damaged. Always read and follow the manufactures installation and operating instructions for the Midnite MNSI6048-ACCPL SMA AC Coupled Kit prior to installation and operation.