Balmar 12V 250A XT Series Alternator, 4in Saddle Mount (No Pulley)

High-Output 250A 12V Charging Power for Marine and Off-Grid Systems

The XT Series 250A 12V Alternator is engineered for demanding electrical systems where standard automotive alternators fall short. Featuring a robust 4in (approx. 101.6mm) dual foot saddle mount, this high-output unit is designed to deliver substantial amperage to large house battery banks in marine vessels and off-grid expedition rigs. Supplied without a pulley, it allows system builders and marine electricians to configure the exact drive interface required for their specific engine setup.

Solving the Challenges of High-Capacity Battery Charging

Modern auxiliary power systems, particularly those utilising large lithium (LiFePO4), AGM, or gel battery banks, place immense continuous loads on charging components. Standard factory alternators are typically designed for intermittent loads and can rapidly overheat or fail when subjected to the constant high-load demands of deep-cycle battery charging. The XT Series reduces the risk of overheating and premature component failure with a braided-stator design and a dual-fan, high-airflow frame.

Customisable Drive Configuration (Pulley Excluded)

Because engine belt configurations vary significantly across marine diesels and custom vehicle installations, this unit is supplied bare, without a pulley. This ensures you do not pay for an incompatible factory pulley and allows seamless integration with either Dual V-belt or multi-groove serpentine belt systems. Select from the following compatible 17mm bore pulleys (sold separately) to match your engine's drive ratio and belt profile:

• 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 (Standard)

Key Features and System Benefits

• High-Amperage 250A Output: Rapidly replenishes depleted 12V battery banks, reducing engine run-time and fuel consumption during charging cycles.
• 4in (Approx. 101.6mm) Dual Foot Mount: Provides exceptional mechanical stability and alignment, reducing vibration-induced wear in rough marine or off-road environments.
• Custom Drive Adaptability: Ready to accept specialised 17mm bore serpentine or Dual V pulleys to prevent belt slippage under heavy 250A mechanical loads.
• Dual-Fan Cooling: A high-airflow frame with dual fans helps manage heat in warm engine rooms.
• Ideal for Lithium Battery Banks: Ideal for pairing with external multi-stage alternator regulators to safely charge high-density lithium battery banks.

Ideal Applications

Whether you are upgrading an auxiliary charging system on a cruising yacht or building an overland vehicle with extensive 12V appliances, the XT Series provides dependable power generation. Its 4in J-180 dual foot (saddle) mount is listed by Balmar as typical for John Deere, Cummins and Caterpillar engines; confirm fit before ordering.

Configure Your High-Output Charging System

Upgrade your vessel or vehicle's electrical reliability with the XT Series 250A 12V Alternator, and be sure to select the matching 17mm bore pulley and external regulation components required for your specific engine installation.