Use this inverter for solar installations with 2kW of modules. With its 120VAC output this unit can be used in residential or commercial settings. Just like every other Sunny Boy Inverter the SWR 1800U can be configured for any of the communications options available. Which means you can combine them with any other SMA inverter and access all the data in one central location. 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