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 constructionRated for systems up to 48 volts DC, negative groundRust-proof anodized aluminum caseStainless steel mounting hardware is providedProtective covers are provided for terminalsSpecifications:Alternator Sources: 2Battery Bank: 3    Max. Amperage Input Capacity: 70Stud Terminal Size: 6mm    Dimensions (L x W x H): 6.5 x 4.5 x 3.1 inchesWeight: 4 lbs.Operating Temperature: -40 to +80 degreesDuty 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.