Balmar Alternator 250 AMP Kit 12V 3.15" Dual Foot Saddle K6 Pulley Regulator & Temp Sensor - XT-CR-250-K6-KIT
Manufacturer Part #: XT-CR-250-K6-KIT
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Balmar XT-Series 250 AMP Alternator Kit – 12V – Dual Foot Saddle – XT-CR-250-K6-KIT
The Balmar XT-Series 250 Amp Alternator Kit is a complete, high-output charging solution designed for vessels with large battery banks and demanding onboard electrical systems. Delivering an impressive 250 amps at 12 volts, this alternator is ideal for cruising sailboats, powerboats, commercial vessels, and yachts running inverters, lithium batteries, refrigeration, air conditioning, and other high-draw accessories.
Built around Balmar’s rugged XT-Series alternator, this kit features a 3.15" dual foot saddle mount for secure, OEM-style installation on compatible marine engines. The included K6 serpentine pulley ensures smooth belt operation and reduced slippage under high loads.
To protect your electrical system and maximize alternator life, the kit includes a Balmar external smart regulator along with a temperature sensor that actively monitors alternator temperature. This allows the system to automatically adjust output, preventing overheating while delivering fast, efficient charging.
Designed for harsh marine environments, the XT-Series alternator features heavy-duty internal components, corrosion-resistant construction, and advanced cooling, making it one of the most reliable high-output alternators available.
Key Performance Features
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Massive Output: Rated at 250 Amps, providing the power necessary to run large inverters, air conditioning, or rapid-charge depleted house banks.
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3.15" Dual Foot (Saddle) Mount: Designed for engines common in marine applications (like many Yanmar and Westerbeke models).
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K6 Serpentine Pulley: Includes a 6-groove serpentine pulley to handle the significant torque required to generate 250A without belt slippage.
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Smart Charging: The included MC-618 Regulator allows for user-programmable charging profiles, ensuring your batteries receive the exact voltage required across all stages (Bulk, Absorption, Float).
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Thermal Protection: Includes both Alternator and Battery temperature sensors. If the alternator gets too hot, the regulator will automatically "dial back" the output to protect the windings.
Technical Specifications
| Feature | Details |
| Model Number | XT-CR-250-K6-KIT |
| Max Output | 250 Amps |
| Voltage | 12V |
| Mounting Style | 3.15" Dual Foot (Saddle Mount) |
| Pulley Type | K6 Serpentine (6-groove) |
| Regulation | External (MC-618 Included) |
| Ground | Isolated Ground (Standard) |
In The Box
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1 x XT-CR-250 Alternator: Features braided wire lead construction for better vibration resistance.
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1 x MC-618 Digital Regulator: The "brains" of the system with an 8-bit processor.
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1 x Alternator Temp Sensor (MC-TS-A): Prevents alternator overheating.
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1 x Battery Temp Sensor (MC-TS-B): Adjusts charging voltage based on battery temperature.
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1 x Wiring Harness: Professional grade with waterproof connectors.
Installation Guidelines
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Belt Load: Generating 250A creates immense mechanical resistance. You must ensure your engine is equipped with a serpentine belt conversion; a single V-belt cannot drive this alternator and will burn up instantly.
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Cable Gauge: Due to the 250A output, you must use high-quality, marine-grade battery cables. For most runs, 2/0 AWG or larger is required to prevent voltage drop and fire hazards.
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Programming: If you are using Lithium (LiFePO4) batteries, you must select the LFP profile on the MC-618 regulator to ensure the alternator doesn't exceed the batteries' maximum charge rate.
Trusted by marine professionals worldwide, Balmar alternators are known for unmatched performance and system protection. The XT-CR-250-K6-KIT provides everything needed for fast, safe, and efficient charging—making it an ideal upgrade for serious cruising and commercial applications.
This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.
Manufacturer : Balmar
Manufacturer Part No : XT-CR-250-K6-KIT
Balmar Alternator 250 AMP Kit 12V 3.15" Dual Foot Saddle K6 Pulley Regulator & Temp Sensor - XT-CR-250-K6-KIT is backordered and will ship as soon as it is back in stock.
Balmar Alternator 250 AMP Kit 12V 3.15" Dual Foot Saddle K6 Pu...
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