Unique to the SPA series is its ability to be operated both indoors and outdoors, through a novel method of controlling airflow needed to maintain the proper system temperature.  The cabinet design assures only front access is necessary to service the unit.  An aspect ratio has been used, similar to that available in the electrical controls industry, to minimize floor space and eliminate the need to remove multiple components or assemblies to access parts in the unlikely event of failure.  To achieve the smallest installed space possible, the airflow system requires absolutely no air intake or exhaust from the back, sides, or top of the cabinet.  The need for only front and bottom access to airflow makes this design a real space saver.  Because of packaging techniques derived from the aerospace industry, the ShorPOWER® SPA Series system offers the lightest weight to kVA ratio in the market.  No other marine frequency converter approximates the low weight of the ShorPOWER® SPA Series units.  Although this series does not provide extended voltage transient and lightning protection through the use of an integrated second transformer, this protection can be made available by using an optional second transformer module.