The new and improved Sunny Boy series of grid-tie transformerless inverters (US-41) fulfills UL 1741, NEC 2014, and NEC 2017 requirements and is compatible with the power line-based SunSpec Rapid Shutdown protocol.
In addition to being the simplest and most cost-effective rapid shutdown solution on the market, the US-41's most impressive feature is its Secure Power Supply: the ability to send up to 2000 Watts to a dedicated outlet inside the house when grid power is offline but the sun is still shining - without the use of batteries. To use the Secure Power Supply, you'll need a switch, outlet, junction box, conduit, and wiring (not included) that will be wired directly to the Sunny Boy inverter to receive these 2000 Watts (installation instructions here).
The Sunny Boy 6.0-US-41 inverter is rated at 6000 Watts at 240 volts (and 5200 Watts at 208 volts). It features multiple independent input channels - each with SMA's OptiTrac™ Global Peak - allowing for hundreds of stringing configurations for flexible system design and improved performance for PV arrays that face the challenges of complex roof shapes and shading.
Based On 1 reviews.
I have three of these inverters (purchased from another source) that I installed on a system of my own design. They were easy to intstall, wire, commission, and run. I had some slight confusion over the use of a neutral wire with the 240 volt connection (I'm in the USA, Idaho) but it turns out it is not needed and I didn't connect it. But that was it. I had no trouble starting them, setting up the software, and getting them online to sunnyportal on the web so I could monitor them. I even used SMA's sunnydesign web site to help design the system. I use the web and the iPhone/iPad apps to monitor the system. In my case Idaho Power did not ask for any of the power company software features to be turned on so I can't comment on that functionality. I consider myself an advanced amateur when it comes to electrical and mechanical projects but I really think these are fairly straight forward if you have some experience with solar. I will buy more of SMA's equipment for another home project in the future. I should note that when thinking about the DC cables for an inverter longer DC cables are better than long AC cables using the highest possible DC voltage allowed. I tend to think the opposite way because a battery setup needs the opposite setup. The inverter is sensitive to small AC deviations because of the net metering safety issues and long AC cables can create these issues. In my system I have 680 feet of DC cable between the panels and the inverter and about 15 feet between the inverter output and the net meter. I've had my system running for six months.