Balmar 12V 250A XT Series Alternator, Single Foot Mount (No Pulley)

High-Output 250A 12V Charging Power for Demanding Electrical Systems

The XT Series 250A 12V Alternator is engineered to meet the high energy demands of modern marine vessels and off-grid expedition builds. Featuring a 1-2in (Approx. 25.4mm or 50.8mm) single foot (spindle) mount, this high-output alternator is designed as a robust power generation upgrade for systems running large auxiliary battery banks, high-draw inverters, and critical onboard electronics.

Standard factory alternators are typically designed for intermittent loads and often suffer from rapid thermal degradation when tasked with charging low-impedance lithium (LiFePO4) or large AGM battery banks. The XT Series mitigates the risk of overheating and premature component failure with a braided-stator design and a dual-fan, high-airflow frame, ensuring reliable power generation when you are far from shore power or the grid.

Key Features and Benefits

• Substantial 250A Output at 12V: Delivers rapid bulk charging to large house battery banks, significantly reducing engine run-time and fuel consumption.
• Single Foot (SF) Mount: 1-2in spindle mount suits 1in Motorola-style and 2in Delco-style single foot brackets.
• Customisable Drive Configuration: Supplied without a pulley to allow precise matching to your engine's specific belt drive system and ratio requirements.
• Dual-Fan Cooling: A high-airflow frame with dual fans helps manage heat when charging large lithium and AGM banks.
• 17mm Shaft Bore Compatibility: Accepts a range of Dual V and multi-rib serpentine pulleys for seamless integration into existing setups.

Why Upgrade to a High-Output XT Series Alternator?

Upgrading your battery storage capacity requires a corresponding upgrade in charging capability. Attempting to charge a high-capacity lithium system with an OEM-grade alternator places immense strain on the stator and rectifier, often leading to system failure in remote locations. The XT Series 250A alternator solves this problem by providing additional charging headroom. By pairing this unit with an appropriate external voltage regulator, users can safely optimise charge profiles for their battery chemistry.

Important Exclusions and Compatible Pulley Options

Please Note: This alternator is supplied without a pulley to accommodate custom engine configurations. To complete your installation, select one of the compatible 17mm bore pulleys listed below based on your belt drive type:

• 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)

Ideal Applications

• Marine Vessels: Yachts and cruisers requiring rapid replenishment of house banks during short motoring intervals.
• 4WD and Expedition Vehicles: Overland builds with custom dual-alternator brackets powering air conditioning, induction cooktops, and large inverters.

Upgrade Your Onboard Power Generation

Configure your custom charging system with the XT Series 250A 12V Single Foot Alternator and select the matching 17mm bore pulley for your engine drive to ensure dependable, high-capacity power delivery on every journey.