Mastervolt Charge Mate Pro 90Meet the Mastervolt Charge Mate Pro 90, Model 83309002a smart electronic charge coupling that evenly distributes charging current between two battery banks to keep your starter and service batteries ready when you need them. Output current: Up to 90 A total; secondary battery charging limited to 40 A; derates above 25C to protect performance. Two battery outlets with auto detection: Automatic 12 24 V detection for two battery banks (starter and