Balmar 12V 170A XT Series Alternator, 3.15in Saddle Mount (No Pulley)

High-Output 12V 170A Alternator for Marine and Off-Grid Power Systems

The XT Series 170A 12V Alternator is engineered to deliver consistent, high-amperage charging performance for demanding auxiliary power systems. Designed for marine vessels, custom 4WDs, RVs and off-grid applications, this high-output alternator provides a significant upgrade over standard factory-fitted automotive units. With a substantial 170A output at 12V, it rapidly replenishes large deep-cycle and lithium (LiFePO4) house battery banks, reducing engine run times and improving overall system efficiency.

Engineered for Reliable High-Output Charging

Standard automotive alternators are typically designed for intermittent loads and can quickly overheat when subjected to the continuous high-current demands of modern lithium battery systems and high-powered inverters. The XT Series addresses these limitations with a braided-stator design and a dual-fan, high-airflow frame. By maintaining stable output under heavy loads, this unit helps reduce the risk of overheating, premature component failure, and unexpected power loss in remote locations.

Featuring a Hitachi-style 3.15-inch (approx. 80mm) dual-foot saddle mount configuration, this alternator offers exceptional mechanical stability. The dual-foot design distributes engine vibration and belt tension evenly across the mounting bracket, minimising mechanical stress and alignment issues common in high-vibration marine and off-road environments.

Key Features and Benefits

• 170A High-Amperage Output: Delivers rapid charging capabilities for high-capacity 12V battery banks, ideal for supporting heavy DC loads and inverters.
• 3.15in (Approx. 80mm) Dual-Foot Mount: Hitachi-style mounting, which Balmar lists as typical for Yanmar, Westerbeke, Lehman and Perkins-Sabre engines.
• Customisable Drive Configuration: Supplied without a pulley, allowing system builders to select the exact drive ratio and belt profile required for their specific engine setup.
• Dual-Fan Cooling: A high-airflow frame with dual fans helps manage heat during prolonged high-output charging.

Pulley Selection and Compatibility

Please note that this XT Series alternator is supplied without a pulley to accommodate custom belt configurations and drive ratios. It accepts 17mm bore pulleys for Dual V or multi-groove serpentine belts. Depending on your engine's belt architecture, compatible pulley options include:

• B-61-0020: Pulley, Dual V 2.7in (approx. 68.6mm) x 1/2in (approx. 12.7mm) DeepV, 17mm Bore
• B-61-0070: Pulley, K-6 2.45in (approx. 62.2mm) Serpentine 6-Rib, 17mm Bore
• B-1310: Pulley, K-8 2.4in (approx. 61mm) Serpentine 8-Rib, 17mm Bore, Short (STD)

Selecting the correct pulley diameter and belt profile is essential for preventing belt slippage under heavy 170A loads and achieving optimal alternator RPM at low engine idle speeds.

Upgrade Your Charging System

Whether you are refitting a marine vessel for extended coastal cruising or building a dependable off-grid touring vehicle, the XT Series 170A 12V Alternator provides the robust electrical foundation your system requires. Pair this unit with the appropriate 17mm bore pulley and a compatible external regulator to build a tailored, high-efficiency charging solution for your energy storage system.