{"product_id":"mastervolt-alpha-pro-iii-45513000-3-step-alternator-charge-regulator","title":"Mastervolt Alpha Pro III 45513000 3-Step Alternator Charge Regulator","description":"\u003cp\u003e\u003cstrong\u003eAlpha Pro III\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAdvanced 3-step charge regulator for standard and high performance alternators\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe propulsion engine of your boat or vehicles may be used to quickly charge your service batteries, either while cruising or taking a break. The advanced and powerful Alpha Pro III ensures fast and safe charging, protecting both the engine and the batteries. Building on 10 years of experience, the Alpha Pro III features a modernized look, higher power and improved ease of use.\u003c\/p\u003e\u003cp\u003eThe Alpha Pro III measures the temperature and the voltage of your batteries to prevent overcharging, keeping them in perfect condition. It also monitors the engine load, thus reducing sound variations, wear and tear. The smart keep alive feature solves a common problem causing unreliable tachometer readings. Via MasterBus, it communicates RPM, alternator status and charge status to create intelligent power systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePull the max out of your alternator\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe alternator that comes with the engine is not optimally suited for charging service batteries. Designed for low cost and short charge cycles, it charges at a slow pace and is easily overheated. Replacing the standard regulator* with the Alpha Pro III optimizes this charging process, protects against overheating and overcharging and extends the lifetime of your batteries.\u003c\/p\u003e\u003cp\u003e(* not allowed on Euro 5\/6 engines)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSuper charge your system\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor superfast charging at low RPM, Mastervolt recommends to combine the Alpha Pro III with a high performance alternator such as the reputable Alpha series. With 20 amps of field current capability, the Alpha Pro is the only 3-step regulator in the market capable of controlling alternators with outputs up to 400 A!\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAlpha Pro III: Fast charging, anytime, anywhere.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTransforms every alternator into a full temperature controlled 3-step charger.\u003c\/li\u003e\n\u003cli\u003eReduces run time, saves fuel, reduces noise and emissions.\u003c\/li\u003e\n\u003cli\u003eProtects from overcharging and extends battery life.\u003c\/li\u003e\n\u003cli\u003eBalances engine load, reducing RPM variations.\u003c\/li\u003e\n\u003cli\u003eCompatible with standard and high performance alternators, incl. 200 A  400 A models.\u003c\/li\u003e\n\u003cli\u003eIntegrated keep alive feature for reliable tachometer readings.\u003c\/li\u003e\n\u003cli\u003eSuitable for every battery type, including Lithium Ion.\u003c\/li\u003e\n\u003cli\u003eSuitable for 12 V and 24 V system voltages.\u003c\/li\u003e\n\u003cli\u003eMasterbus compatible: simplifies wiring, saves space and weight, and creates optimal cooperation between Mastervolt products.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eApplications range from improving the performance of a standard alternator in a vehicle or boat, to generator replacement, when combined with a high performance alternator.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/productimageserver.com\/prop65\/6pt.png\" alt=\"Warning\"\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to \u003ca href=\"http:\/\/P65Warnings.ca.gov\"\u003eP65Warnings.ca.gov\u003c\/a\u003e.\u003c\/p\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003e\u003cstrong\u003eMastervolt Alpha Pro III\u003c\/strong\u003e is an advanced 3-step alternator charge regulator for boat and vehicle charging systems using standard or high-performance alternators. Designed to help service batteries charge quickly and safely, it monitors battery temperature and voltage while managing engine load for more consistent operation. The result is a smarter charging system that supports battery care, reduced engine runtime, and improved alternator performance.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eThe Alpha Pro III transforms an alternator into a temperature-controlled 3-step charger. Its 20-amp field current capability allows control of alternators with outputs up to 400 amps, making it suitable for systems ranging from standard alternator upgrades to high-performance charging setups. When paired with a Mastervolt Alpha high-performance alternator, it supports fast charging at low engine RPM and can serve as part of a generator replacement system.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eBuilt-in battery temperature and voltage monitoring helps prevent overcharging, while engine-load monitoring helps reduce RPM variations, sound changes, and wear during charging. The integrated keep-alive feature supports reliable tachometer readings, and MasterBus compatibility enables communication of RPM, alternator status, and charge status with other Mastervolt products. The regulator is suitable for 12-volt and 24-volt systems and supports battery types including Lithium Ion.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTemperature-controlled 3-step charging helps optimize alternator charging and protect batteries from overcharging.\u003c\/li\u003e\n\u003cli\u003e20-amp field current capability controls standard and high-performance alternators with outputs up to 400 amps.\u003c\/li\u003e\n\u003cli\u003eEngine-load monitoring helps balance operation and reduce RPM variations during charging.\u003c\/li\u003e\n\u003cli\u003eIntegrated keep-alive feature supports reliable tachometer readings.\u003c\/li\u003e\n\u003cli\u003eMasterBus compatibility simplifies system communication and coordination with Mastervolt products.\u003c\/li\u003e\n\u003cli\u003eSupports 12-volt and 24-volt systems and battery types including Lithium Ion.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eProduct Details:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: Mastervolt\u003c\/li\u003e\n\u003cli\u003eProduct: Alpha Pro III advanced 3-step alternator charge regulator\u003c\/li\u003e\n\u003cli\u003ePart number: 45513000\u003c\/li\u003e\n\u003cli\u003eIntended use: Boat and vehicle service-battery charging systems\u003c\/li\u003e\n\u003cli\u003eAlternator compatibility: Standard and high-performance alternators, including 200-amp and 400-amp models\u003c\/li\u003e\n\u003cli\u003eSystem voltage: 12 volts and 24 volts\u003c\/li\u003e\n\u003cli\u003eMasterBus compatible\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eCalifornia Proposition 65 Warning:\u003c\/strong\u003e WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to \u003ca href=\"http:\/\/P65Warnings.ca.gov\"\u003eP65Warnings.ca.gov\u003c\/a\u003e.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eChoose the Mastervolt Alpha Pro III for controlled, high-capacity alternator charging in marine and vehicle power systems.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eSEO Meta Description:\u003c\/strong\u003e Mastervolt Alpha Pro III alternator charge regulator delivers temperature-controlled 3-step charging for 12V and 24V boat and vehicle battery systems.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eTemperature-controlled 3-step charging helps optimize alternator charging and protect batteries from overcharging.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e20-amp field current capability controls standard and high-performance alternators with outputs up to 400 amps.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eEngine-load monitoring helps balance operation and reduce RPM variations during charging.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eIntegrated keep-alive feature supports reliable tachometer readings.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eMasterBus compatibility enables communication with Mastervolt products and helps simplify system integration.\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSupports 12-volt and 24-volt systems and battery types including Lithium Ion.\u003c\/li\u003e\u003c\/ul\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eTruck Freight: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eOversized: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eOwners Manual Url: https:\/\/productimageserver.com\/literature\/ownersManual\/69995OM.pdf\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":44881672503385,"sku":"69995","price":420.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/69995XL.jpg?v=1789193870","url":"https:\/\/www.marinepartsonly.com\/products\/mastervolt-alpha-pro-iii-45513000-3-step-alternator-charge-regulator","provider":"Marine Parts Only","version":"1.0","type":"link"}