The compact design of the Sunny Boy 4000US inverter makes it suitable for residential and light commercial use and the integrated DC disconnect helps keep installations cost effective. It is field configurable for positive ground systems. The Sunny Boy 4000US is auto-sensing for use on 240 and 208 VAC applications. It comes with a DC disconnect and a 4 circuit integrated fused series string combiner that can be used with fuses up to 20 amps. It is shipped with 15-amp fuses.
SMA inverters come standard with built-in LCD digital monitors that display instantaneous power output, the current day's power production, and the total energy produced since installation.All SMA inverters are compliant with UL 1741, UL 1998, IEEE-929, IEEE-1547, FCC Part 15 A & B. SMA inverters now have a standard 10-year warranty, with 5 and 10 year extensions available.