621-Series 70 Amp 24 Volt Alternator KitDesigned for Recreational Applications 70 Amp in a Small Case Package Single Foot 1" / 2” Mount K6 Pulley Up to 25A at Idle Speeds Patented Smart Ready Technology Dual Fan Cooling High Airflow Frame Maximum RPM: 12,000 USCG Title 33, ISO, SAE and CE Compliant Balmar 621-Series Alternators deliver high-output performance in a compact case. While all Balmars high-output alternators are designed and recommended for use with their multi-stage voltage regulators, the 621-Series Alternator utilizes Balmars Smart Ready Technology. Smart Ready internal regulation enables the alternator to be used as a stand-alone, charge controller that is ideal as a built-in backup regulator for the cruiser, or as a full-time regulator for systems where Smart Multi-Stage Regulation is not required. If battery loads are relatively small and your engine is running frequently, the alternators internal regulator may be sufficient to support your electrical needs without external regulation. If your vessel utilizes larger deep-cycle battery banks or the engines duty cycle is less frequent (as is the case in most sailing applications). Max Charge MC-624 Voltage Regulator 7 Selectable Programs for Marine Batteries 15 Amp Maximum Field Current Advanced Programming Modes Alternator & Battery Temperature Sensing & Control Exclusive Belt Load Manager Function Bright LED Display and Easy Programming Mode Can be Used in Twin-Engine Applications with Centerfielder Ii Temperature Sensor Cables Temp Sensors can be used for 12 Volt and 24 Volt Systems MC-TS-A – Alternator Cable, 54” Length MC-TS-B – Battery Cable, 240” Length