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SMA
Sunny Boy Grid-Tie Inverters
SMA Sunny Boy inverters are the most widely used grid-tie PV inverters in the world. SMA inverters are available in sizes from 700 watts to 7,000 watts, making them ideal for a wide range of applications from small residential systems to very large 3-phase industrial systems.
All SMA inverters come standard with built-in LCD digital monitors that display instananeous power output, energy delivered during the current day and the toal energy produced since installation.
The SB700 and 1800 have 12 VAC output. The SB3000 and SB4000 are auto-sensing for use on 240 VAC and 208 VAC 
applications. The SB5000, 6000, and 7000 can be used in 208, 240 and 277 VAC applications. SMA offers a wide range of accessories for communications and monitoring of the system. The SB 3000 and 4000 come with a DC disconnect switch and the SB 5000, 6000 and 7000 come with an AC/DC disconnect switch, each with an integrated fused series string combiner that connects to the bottom of the inverter. The disconnect switches are housed in a NEMA 3R enclosure. All electronic components are in a sealed compartment.
NEW!! Sunny Island
The Sunny Island inverters can be used for standalone off-grid systems, and they are a great way to add battery backup to an SMA Sunny Boy inverter based grid-connected system.
Grid-Tie System Backup
To do this, the grid-tie inverter output and the Sunny Island inverter output both feed circuit breakers in a sub-panel that also powers critical loads - in the event of a grid failure. As long as grid power is present, it feeds the subpanel through the transfer switch in the Sunny Island. If the grid fails, the Sunny Island connected to a bank of batteries acts as the source of AC power, or the "AC grid" for that subpanel. This powers the critical loads connected to the subpanel and keeps grid-connected systems running if the sun is shining. The loads are actually powered directly by the grid-tie system if the sun is shining. If the grid-tie system is putting out more power than the loads need during a grid failure, the Sunny Island charges the batteries. At night or when power production is low and load use is high, the Sunny Island provides power from the battery bank. In the morning, the batteries are recharged and the cycle begins anew until the grid power returns. If the grid-tie inverter has a 240 VAC output, a backup system will require two Sunny Island inverters or one inverter and an autotransformer.
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