Grid-tied Battery Backup
AC Coupled Systems

morningstar charge controllers

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Grid Tied Battery Backup; AC Coupled, Outback GridZero Technology


Battery Based Backup Systems

Our grid-tie systems with battery back-up will not only allow you to feed excess power back into the grid, but it will also offer you the security of back-up power when the utility goes down. During the day the solar panels will feed any excess power back to the utility. During a black-out the system’s battery bank will provide the electricity to run the loads you deem essential to you.


gridzeroIf you click on the detail page of any of the kits listed below then scroll down the page until you see "What's On the Truck", you will see a list of the main parts we supply. Optimizing kits typically requires customizing system design beyond the basic design parameters. Mounting on the roof or ground, types of attachment, size and type of the battery bank required, if there is a generator in the design are individuals specific property requirements. Habits, available space, budget and aesthetics does not get more individual than that. As a result there is an absolute requirement for system flexibility beyond the basic package. There are options on the detail pages for racking (roof or ground), attachment and battery bank to accommodate nearly every application you might encounter.

Normally we take the wire to the edge of the array where the transition is usually made to conduit. Here are some additional items that your may need from your local hardware store. The remaining balance of system (BOS) components can be; conduit, ground wire, wire inside the conduit, some minor fasteners and sealants and combiner box (sometimes referred to as "J" box or junction box) which used to combine multiple strings into a single pair of wires. These items are readily available at your local hardware store. How much can you expect to spend? That depends, but the size of the system and other individual site specific variances, but we consistently hear from customers for a 3kW - 5kW kit is about $250 - $300 for BOS components.


Magnum Energy AC Coupling Micro-Inverters

magnum ac coupled 

Magnum Energy Inverters from Sensata Technologies are designed to be reliable and easy to expand solar. Add solar with the MicroGT series. Then, when it makes sense, using the uniquely optimized format of the MicroGT, add battery storage for a complete solar+storage energy solution.An AC coupled system will sell the solar power to the grid under normal conditions. When there is a power outage the battery based inverter will open its relay and disconnect from the grid. It will produce AC power for the critical loads at this time. The Magnum Micro-Inverters will connect to the battery based inverter to run the loads and charge the batteries from the solar panels. When the batteries get full there is a relay inside the AC coupled battery based inverter system that disconnects the grid tie inverter to prevent the batteries from being over charged.

ac coupling Item # # Solar Panels Monthly kWh @ 5 Sun Hours /Day STC* Backup Energy Storage Price before 30% Federal Tax Credit or Local Incentives.
2.3 kW Magnum AC Coupled Kit MEACCSM-2280  8 - 285 Watt  342 kWh   Varies w/ Optional Battery Selection 
2.9 kW Magnum AC Coupled Kit MEACCSM-2850  10 - 285 Watt  428 kWh   Varies w/ Optional Battery Selection 
3.4 kW Magnum AC Coupled Kit MEACCSM-3420  12 - 285 Watt  513 kWh   Varies w/ Optional Battery Selection 
4.0 kW Magnum AC Coupled Kit MEACCSM-3990  14 - 285 Watt  599 kWh   Varies w/ Optional Battery Selection 
4.6 kW Magnum AC Coupled Kit MEACCSM-4560  16 - 285 Watt  684 kWh   Varies w/ Optional Battery Selection 
5.1 kW Magnum AC Coupled Kit MEACCSM-5130  18 - 285 Watt  770 kWh   Varies w/ Optional Battery Selection 
5.7 kW Magnum AC Coupled Kit MEACCSM-5700  20 - 285 Watt  855 kWh   Varies w/ Optional Battery Selection 
6.3 kW Magnum AC Coupled Kit MEACCSM-6270  22 - 285 Watt  941 kWh   Varies w/ Optional Battery Selection 
6.8 kW Magnum AC Coupled Kit MEACCSM-6840  24 - 285 Watt  1,026 kWh   Varies w/ Optional Battery Selection 


OutBack FLEXpower™ TWO; Dual Inverter; OFF-GRID, BACKUP, GRID-TIE

flexpower two 


The FLEXpower™ TWO System is ideal for applications with medium-sized power requirements such as larger homes and business or back-up power systems. FLEXpower™ system components carry all of the necessary ETL certifications for a code-compliant installation that not only saves time and money, but also retains a fully-customized look.

48 vdc
Item #
Voltage DC (Battery) / AC Daily Watts @ 4 Sun Hours /Day STC* # Solar Panels Price before 30% Federal Tax Credit
1.7 kW FLEXpower TWO FLEX2CS-48-1680  48 / 120/240VAC  6,720 Watts  6 - 280W
2.5 kW FLEXpower TWO FLEX2CS-48-2520  48 / 120/240VAC  10,080 Watts  9 - 280W
3.4 kW FLEXpower TWO FLEX2CS-48-3360  48 / 120/240VAC  13,440 Watts  12 - 280W
4.2 kW FLEXpower TWO FLEX2CS-48-4200  48 / 120/240VAC  16,800 Watts  15 - 280W
5.0 kW FLEXpower TWO FLEX2CS-48-5040  48 / 120/240VAC  20,160 Watts  18 - 280W
5.9 kW FLEXpower TWO FLEX2CS-48-5880  48 / 120/240VAC  23,520 Watts  21 - 280W
6.7 kW FLEXpower TWO FLEX2CS-48-6720  48 / 120/240VAC  26,880 Watts  24 - 280W
7.6 kW FLEXpower TWO FLEX2CS-48-7560  48 / 120/240VAC  30,240 Watts  27 - 280W
8.4 kW FLEXpower TWO FLEX2CS-48-8400  48 / 120/240VAC  33,600 Watts  30 - 280W





The Radian Series GS8048 Grid/Hybrid™ with GSLC175-PV-120/240 Prewired Load Center (full-flexibility grid-interactive/off-grid) inverter/charger that is engineered toward one goal: making system design and installation easier and faster in grid-interactive and comprehensive off-grid applications. As a leader in off-grid energy systems designed around energy storage, OutBack Power is an innovator in Grid/Hybrid system technology, providing the best of both worlds: grid-tied system savings during normal or daylight operation, and off-grid independence during peak energy times or in the event of a power outage or an emergency. Grid/Hybrid systems have the intelligence, agility and interoperability to operate in multiple energy modes quickly, efficiently, and seamlessly, in order to deliver clean, continuous and reliable power to residential and commercial users while maintaining grid stability.

Item #
Voltage DC (Battery) / AC Daily Watts @ 4 Sun Hours /Day STC* # Solar Panels Price before 30% Federal Tax Credit
3.4 kW Radian RADCS-3360  48 / 120/240VAC  13,440 Watts  12 - 280W
4.2 kW Radian RADCS-4200  48 / 120/240VAC  16,800 Watts  15 - 280W
5.0 kW Radian RADCS-5040  48 / 120/240VAC  20,160 Watts  18 - 280W
5.9 kW Radian RADCS-5880  48 / 120/240VAC  23,520 Watts  21 - 280W
6.7 kW Radian RADCS-6720  48 / 120/240VAC  26,880 Watts  24 - 280W
7.6 kW Radian RADCS-7560  48 / 120/240VAC  30,240 Watts  27 - 280W
8.4 kW Radian RADCS-8400  48 / 120/240VAC  33,600 Watts  30 - 280W
9.2 kW Radian RADCS-9240  48 / 120/240VAC  36,960 Watts  33 - 280W

ampsAmps AC Out; Define Your Needs: A Single Radian inverter's continuous AC output current is limited to 33.3 AAC. The issue here is that the combination of your normal loads (Not Surge Loads) might exceed the inverters output current rating (Amps Out) on larger PV systems. It is critical in the design selection that you make sure the continuous AC load combination of your power requirements is at or below the 33.3 AAC output limit of a single Radian inverter in these kits. If your AAC out is larger than 33.3 AAC, then for each inverter you add, stacked in parallel, you can increase the AAC out by 33.3 AAC. (Example: 2 Radian Inverters = 66.6 AAC Output)

Grid-Tied Battery BackupAC Coupling of Solar Arrays

Battery-based grid-tied systems have the capability of not only exporting electricity back to the utility grid much like a conventional grid-interactive system, but also can operate off-grid creating a micro-grid within the home. There are a number of systems Blue Pacific Solar has available that will operate in this capacity but they require a litte more homework on the part of the homeowner the first of which is an understanding what makes these solar systems different.

Conventional battery-based grid-tied system inverters use the solar panel system to recharge the batteries via a charge controller much the same way an off- grid system would be used. The difference being a grid interactive inverter pulls power from the battery bank while syncing with the utility grid to push electricity back to the homes service lines. You could have multiple solar panel arrays putting energy into the battery bank and one inverter selling or exporting power to the grid. You could also have one charging source and multiple inverters selling to the grid. In short, your charge controller simply charges your battery bank. You’ll want to size your battery bank for your backup needs, and make sure the charge controller for your charging source has an output voltage compatible with your battery bank. We highly recommend you use a 48V battery bank for the majority of homes in these situations. The inverter in a battery-based grid-tied system is not directly coupled or matched to the charging sources. It only needs to be large enough to handle the total charging wattage of your sources, so it will be able to send excess energy back to the grid even in times of peak production. The inverter, of course, also needs to be able to have the capacity to run all the backup loads you might want on at one time.

The specific configuration will depend on your situation. Perhaps you are already familiar with batteryless grid-tied systems, which couple a specific solar array to a specific inverter the two must be matched to work properly. Blue Pacific Solar is one of only a handful of suppliers that have done the design work to customize a specific inverter to work safely and effectively with complete battery-based systems. Grid-tie with battery backup systems are definitely not a situation where you can buy solar panels then go shopping for an inverter. You should buy the power center specificaly designed to work with the correct battery bank that is large enough to handle your critical load circuits.