Balmar XT-CR-250 High Output Marine Alternator

Balmar XT-CR-250 High Output Marine Alternator – 12V 250A External Regulated Alternator with Pulley Options

The Balmar XT-CR-250 is a premium high-output 12V marine alternator engineered for modern lithium and high-capacity house battery systems. Designed specifically for common-rail diesel engines, the XT-CR-250 delivers up to 250 amps of charging performance in a compact small-case frame, providing exceptional output even at low engine speeds.

Featuring Balmar’s Smart Ready® technology, advanced cooling and heavy-duty internal components, the XT Series alternators are built to operate continuously in demanding marine environments. When paired with an external smart regulator such as the MC-618 or WS500, the XT-CR-250 provides precise multi-stage charging control suitable for lithium, AGM and lead-acid battery banks. ()

Key Features:
• High output 250A charging capability in compact small-case design
• Designed for external smart regulation (P-Type field)
• Smart Ready® internal fail-safe regulation technology
• Dual internal cooling fans for improved thermal management
• High idle output performance for modern electrical loads
• Ignition protected and marine compliant construction ()

Pulley Options:
The XT-CR-250 is available with multiple pulley configurations to suit various engine and belt systems:

• K6 Serpentine Pulley – Common on modern marine diesel engines
• J10 Serpentine Pulley – High load multi-rib belt setups
• Dual V-Belt Pulley – Traditional twin belt marine installations
• AltMount® Conversion Kits available for engine-specific setups ()

Technical Specifications:
Voltage: 12V
Output: Up to 250A
Regulation: External P-Type (MC-618 compatible)
Mount Style: 3.15" Dual Foot Saddle (CR – Common Rail configuration)
Cooling: Dual Internal Fans
Cut-In RPM: Approx. 1350 RPM
Max Alternator RPM: 18,000 RPM
Construction: Ventilated cast aluminium housing
Positive Output: M8 threaded stud
Ignition Protection: USCG Title 33, SAE J1171, ISO 8846 ()

Performance & Design:
The XT Series features a high-airflow frame and advanced stator design to deliver strong output at idle speeds — producing significantly more charging current at low RPM compared to standard alternators. This allows onboard systems to maintain charge without excessive engine revving. ()

Ideal For:
Lithium house battery charging, Victron and Balmar smart charging systems, cruising yachts, offshore powerboats, commercial vessels and high-demand marine electrical installations.

The Balmar XT-CR-250 provides serious charging capability in a compact marine-grade package, delivering reliable high-amperage performance with flexible pulley options for a wide range of modern engine installations.