Battery Isolators Optimized heat sink design for maximum performance; Minimized voltage drop across isolation barrier using Schotky type diodes; Each output individually capable of carrying the full alternator load; Fixed cable posts for secure connections; Waterproof components for harsh environment performance - year after year; NOTE: If used on a 24V system, boat must be equipped with 24VDC alternator; Guest Battery Isolators Feature: Solid state design; Marine grade construction; Two-year warranty -Through Guest; 70 Amp Battery Isolator Usage: 1 Alternator / 2 Batteries; Max. Output per Alternator: 70 Amps; Operation: 12V to 48V; Dimensions: 5.4" x 4.5" x 2.6";