Sunny boy 2500u installation and operator s manual sb2500u 11 ne 6 sma regelsysteme gmbh 1 introduction the sma sunny boy is a string inverter for grid tied operation. 2 3 validity of documentation the sunny boy sb 2500 and sunny boy sb 3000 are identical in construction and only differ in their technical data. Sunnyboy2500 sb2500 sb2500 it sunnyboy3000 sb3000 sb3000 it keep this manual in a convenient place for future reference.