Use the SB 1100U for kilowatt starter systems, educational, or demonstration projects. It's great to fill tight spaces, or as a solution for challenging roof topologies. Just like every other Sunny Boy Inverter the SB 1100U can be configured for all of the communications options available. Which means you can combine them with any other SMA inverter and access the data in one central location. As an added advantage, the SB 1100U has a new control board that allows for any remote communications option to be used simultaneously with the Sunny Boy Display! Features: Simplest design and conspicuous reduction of installation costs Guarantee for 5 years No DC distribution boxes necessary Diagnosis and communication via network or via data cable (RS232 or RS485) Enhanced temperature range -25 C to +60 C ambient temperature Degree of protection IP65, optimal for outside installation UL accredited via UL 1741