2-3-70 Battery IsolatorThis heavy-duty isolator allows charging multiple batteries automatically from one or two alternators and prevents the discharge or 'dumping" of one battery into another. Each battery is charged according to its need without overcharging and is rated for 12-, 24-, or 36-volt negative ground DC systems. Features: Conservatively rated diodes and a rustproof anodized aluminum heat sink case. Heavy-duty construction Rated for systems up to 48 volts DC, negative ground Rust-proof anodized aluminum case Stainless steel mounting hardware is provided Protective covers are provided for terminals Specifications: Alternator Sources: 2 Battery Bank: 3 Max. Amperage Input Capacity: 70 Stud Terminal Size: 6mm Dimensions (L x W x H): 6.5 x 4.5 x 3.1 inches Weight: 4 lbs. Operating Temperature: -40 to +80 degrees Duty Cycle: Continuous rating to 50 degrees C Derate linearly to 70% @ 80 degrees C. Temp. Rise: 5 degrees C at full rated current (mount vertically for optimum cooling) Voltage Drop: 0.7V @ 50% load, 0.9V @ full load *Note: These battery isolators are not compatible with self-exciting alternators. The alternator must have an external excitation lead. Please consult the manufacturer of your alternator if you are unsure of your configurationThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Quick Guide (pdf)