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Balmar XTSF250K6 High Output Marine Alternator 250 Amp 12V Single Foot K6 Serpentine

Manufacturer

Balmar

<h3>About Balmar: Marine DC Power Since 1981</h3><p>Since its founding in 1981, <strong>Balmar</strong> has built a reputation as one of the most trusted names in marine DC power. For over four decades, the company has focused exclusively on helping sailors and power boaters solve one of the most persistent challenges on the water: keeping batteries charged reliably and efficiently. That singular focus has made Balmar the go-to choice for serious mariners who demand more from their electrical systems.</p><h3>Innovative Alternator Technology</h3><p>Balmar's greatest claim to fame is its lineup of <a href="/12782-balmar-alternators-200087">marine alternators</a> — widely regarded as the highest-output and most dependable alternators available in the recreational marine market. What sets Balmar apart is not just raw output, but smart engineering. Their patented <strong>Smart Ready&reg; Alternator</strong> technology allows the alternator to communicate directly with an external regulator, enabling precise, multi-stage charging profiles that protect batteries and extend their service life. Whether you're running a modest weekend sailboat or a fully outfitted bluewater passage-maker loaded with electronics, Balmar offers an <a href="/12782-balmar-alternator-2412">alternator</a> sized and engineered for the task.</p><p>Marine environments are uniquely demanding — salt air, vibration, and the need for long, uninterrupted charging cycles put far more stress on electrical components than typical automotive applications. Balmar designs its alternators specifically for these conditions, with robust construction and thermal management that keeps performance consistent even during extended motoring passages.</p><h3>Battery Monitors &amp; Charging System Management</h3><p>A high-output alternator is only part of the equation. Knowing the true state of your battery bank is equally critical, which is why Balmar also produces a respected line of <a href="/12782-balmar-battery-monitors-volt-meters-200146">battery monitors and volt meters</a>. These instruments give mariners accurate, real-time insight into battery voltage, state of charge, and current flow — the kind of data that prevents being stranded at anchor with a dead house bank. Balmar's monitoring products are designed to integrate seamlessly with their charging ecosystem, giving you a complete picture of your DC system's health at a glance.</p><h3>Expert Support &amp; a Legacy of Trust</h3><p>Beyond the products themselves, Balmar has long been recognized for its exceptional technical support. Marine electrical systems can be complex, and Balmar's knowledgeable team has a well-earned reputation for helping customers spec the right components and troubleshoot installations. That combination of innovative hardware and genuine expertise is a big reason why Balmar has remained a privately held, customer-focused company for over 40 years — and why the brand continues to be found aboard everything from coastal cruisers to offshore racing yachts.</p>

Part Number

XTSF250K6
09/12/2036 11:53 AM
Sale Price

$1,155.12

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Product Details

The Balmar XT-SF-250-K6 is a high-performance 250-amp alternator designed for marine, RV, and powersports applications requiring exceptional charging power in a compact package. This 12-volt alternator features advanced braided stator wire design and delivers superior output, even at low engine speeds.

Advanced XT-Series Technology:

  • State-of-the-art braided wire stator with 96 slots (versus 36 in traditional designs) for superior electromagnetic efficiency
  • Industry-leading 85% copper winding density for maximum output in minimal space
  • Delivers up to 186 amps at idle speeds for 12V applications
  • Runs 5-10°C cooler than previous AT-Series designs
  • Dual fan cooling system with high airflow frame design
  • Smart Ready® internal regulator technology for enhanced fault tolerance

Mounting and Compatibility:

  • Single foot spindle mount design (1-2 inch)
  • K6 serpentine pulley configuration with case ground
  • 1-inch Motorola-style mounting: Compatible with Westerbeke, Lehman, Hino, and Pathfinder engines
  • 2-inch Delco-style mounting: Compatible with Volvo Penta (gas and diesel), John Deere, Perkins, Mercruiser, Pleasurecraft, Crusader, Indmar, Marine Power, and other GM-based engines
  • Requires dual vee or multi-groove serpentine belt configuration

Certifications and Ratings:

  • USCG Title 33, ISO 8846, and SAE J1171 certified for marine applications
  • Ideal for lithium battery bank charging systems

This alternator is perfect for vessels and vehicles with high electrical demands, particularly those operating frequently at idle speeds. The XT-Series produces over 100 amps at idle, making it ideal for powersports applications with ballast pumps, high-output audio systems, and multiple instrumentation loads. May require a tachometer signal stabilizer (Part No. 15-TSS) if your current tachometer is not adjustable.

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