Shop Marine How
  • 200A J180 Mount Large Frame Alternator - CMI

    $699.00 $629.00


     Click Here For International Shipment Info


    For the first time ever Compass Marine Inc. is offering a massive J180 large frame high performance externally regulated alternator at sub $1000.00 prices.

    After many months of testing various large frame J180 mount alternators, for performance and heat characteristics, Compass Marine Inc. is proud to introduce the new CMI-200-J180. This 200A alternator is a literal behemoth, similar to the massive alternators found on big-rigs, ambulance, rescue and other applications where high output demand, to run high amperage equipment for long periods of time, is required.

    The CMI-200-J180 is the ideal alternator for charging large AGM, GEL or LiFePO4 battery banks while at the same time keeping costs to a reasonable level. CMI can control these costs as we build these alternators one at a time here in the CMI shop. With no other CMI alternator dealers, to drive up the end user cost, our prices on externally regulated alternators simply can't be beat.  Pair the CMI-200-J180 with a Balmar MC-614H and your still under $1000.00 for a 200A extreme duty alternator.

    The problem with typical commercial and industrial duty-alternators is they are all internally regulated and not well suited to charging the expensive deeply cycled banks normally found on boats. While extremely robust, they are intended to power aux equipment on these rigs, not to properly charge the batteries, in a healthy manner

    Compared to typical small case alternator, with a maximum running temp in the low 200F range, the CMI-200-J180 can be run at 255F +/- continuously all day long. This means you can actually raise the alternator temp limit on a Balmar regulator! The CMI-200-J180 can deliver 125A at a typical idle speed (2000 alternator shaft RPM) and over 140A at a "fast idle" or about 2400 alternator shaft RPM.

    Features & Benefits

    • Dual internal fan design provides maximum cooling even in hot engine bays
    • Smallest & most compact frame of any J180 mount heavy duty alternator
    • Amazing efficiency, upwards of 68%, means less waste heat to dissipate
    • Massive 62mm pulley end bearing
    • Hot forged rotor poles for less magnetic noise
    • Can handle 10,000 RPM continuously
    • Drive end bearing fan keeps the bearing cooler so it lasts longer
    • External & internal bearing protectors keeps moisture out of the bearings
    • Brush holder seal and moisture protection
    • Direct mounted slip rings for less connections and better reliability
    • Massive 14mm slip rings means better contact and less brush chatter
    • 80A avalanche diodes mean longer life and better protection from load dumps
    • Massive rectifier heat sink means lower rectifier temps and longer life
    • Alternator shaft is .875" or 22mm


    *In order to keep costs down this alternator has not been spark tested for USCG compliance for use with gasoline engines.

    *Fitment to your engine us up to the purchaser and on most sailboat AUX engines will require a custom made mount

    *This alternator does not ship with a pulley. Just let me know what you need and I can get you a price.

    *Also available in a 250A model with a 3-5 week lead time for the custom winding.

    Questions: compassmarineservices at gmail dot com