© Copyright 2010 Amptech Energy Systems  --  SITE MAP ETL Tested to UL 1741 Standard All of our products are manufactured in the United States and meet the UL standard of quality, safety, and reliability. Amptech Enery Systems Combiner Box White Fiberglass Construction NEMA UV Stabilized, Waterproof Site Specified Wiring (Bottom Entry, Drip Loop Suggested) All of the images below represent a 24 string combiner box, with the exception of the last image. The last image is of a 12 string combiner box fully connected and functioning in the field.