ELTEK's UNT20806.00008 Unity Power System with FLATPACK2, 48V, 500A Power Shelf, Rectifier Positions: QTY 8 (Supports Both 2000W and 3000W Rectifiers), Input Connections: Rear Access to Terminal Block, One Input Per Rectifier, Dual Feed Jumpers Included. Primary Distribution: 19in Wide, Positive Voltage Output, QTY 21 Circuit Breaker Positions (CBB Style) 1/4in-20 Stud 5/8in Center, QTY 21 Load Breaker Positions QTY 3 Bulk Load Positions, QTY 1: 3/8in-16 Nuts on 1in Center, QTY 2: 1/4in-20 Nuts on 5/8in Center. Bulk Battery Positions Thru A Shunt Only, QTY 5: 3/8in-16 Studs on 1in Center or QTY 5: 1/4in-20 Nuts on 5/8in Center, SMARTPACK S Panel Mount Controller Included SPSP-UNT600-A01, UNT-F4808I-A13P