{"product_id":"mastervolt-mac-plus-24-12-50-dc-dc-converter-50a","title":"Mastervolt Mac Plus 24\/12-50 DC-DC Converter Charger","description":"\u003cp class=\"nvn-hero\"\u003eThe Mastervolt Mac Plus 24\/12-50 takes 24 volts and delivers a properly managed 12-volt charge at up to 50 amps. It's the fix for service batteries starved by smart alternators and start\/stop engines. Fanless, lithium-ready, and NMEA 2000 friendly, it's a set-and-forget answer for 24-volt boats that need clean 12-volt power.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Mastervolt Mac Plus 24\/12-50 is a DC-to-DC converter and charger built for boats that run a 24-volt house or start system but still need clean, well-managed 12-volt power on the service side. Feed it 24 volts and it hands you a properly charged 12-volt bank at up to 50 amps, using the same 3-step+ charge algorithm Mastervolt has trusted for years. If you've ever watched a service battery limp along because a smart alternator wasn't giving it a real charge, this is the box that fixes it.\u003c\/p\u003e\n\u003cp\u003eHere's the problem it solves. Modern engines with Euro 5 and Euro 6 alternators, along with start\/stop systems, throttle back charging voltage to save fuel. That's great for emissions and lousy for your house bank. The Mac Plus sits between the source and the service battery and boosts things back up, delivering a quick and consistent charge even to a completely flat battery. It also watches for engine-run status, so it only pulls when the engine is actually turning. Your starter battery never gets drained to feed the house.\u003c\/p\u003e\n\u003cp\u003eWe like this unit for repower and refit jobs on trawlers, sailboats, and cruisers that are moving over to lithium. It handles flooded, Gel, AGM, spiral, traction, and Lithium Ion chemistries, including LiFePO4, and you set the profile with the on-board DIP switches or through MasterAdjust. A 24-volt sailboat converting its fridge and pumps over to 12 volts is the classic case. Just plan on a small 12-volt sub-panel for those loads rather than tying straight into the main panel. Anglers running a big 12-volt electronics stack off a 24-volt boat lean on it too, since it keeps the sounders and plotters fed without dragging the main bank down.\u003c\/p\u003e\n\u003cp\u003eThe build is what you'd expect from Mastervolt. Aluminium housing, IP23 protection against dust and spray, and a fanless design that cools naturally, so there's nothing to hum in a quiet cabin at anchor. Efficiency runs better than 95 percent, peaking around 97, which means very little of your charge current gets wasted as heat. It's rated from -25 to 60 degrees C, though it starts derating above 40, so give it some breathing room when you mount it. Vertical, with clear space around the housing, is the way to go.\u003c\/p\u003e\n\u003cp\u003eWiring is straightforward but don't skimp on it. The Mac Plus uses three heavy M8 terminals for the positive input, positive output, and shared negative, and they'll take cable from 10 up to 50 mm2. At a sustained 50 amps you want heavy gauge on both sides and a proper fuse close to each battery. There's also an 8-pole screw connector for the remote on\/off, the included battery temperature sensor, and the voltage-sense leads that compensate for cable drop and keep the charge accurate at the battery, not just at the converter.\u003c\/p\u003e\n\u003cp\u003eNeed more than 50 amps? You can run up to ten of these in parallel for well over 100 amps of 12-volt output, which is how bigger boats scale it. And because it speaks MasterBus, CZone, and NMEA 2000, the Mac Plus drops right into a monitored system. You'll see status, current, and alarms on your existing display instead of guessing. The 3-color LED on the unit gives you a quick health check at a glance too. Set it up once and it pretty much looks after itself trip after trip.\u003c\/p\u003e\n\u003cp\u003eOne honest note. This is a 24-to-12 volt converter. If your boat is 12 volt in and 12 volt out, or 48 volt, you want a different model in the Mac Plus family, and we're happy to point you to the right one. But if you've got 24 volts to work with and a service bank that deserves a real charge, the Mac Plus 24\/12-50 is about as solid and set-and-forget as they come.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e24V input to a managed 12V output at up to 50A, so a smart alternator or start\/stop engine can't starve your service bank\u003c\/li\u003e\n  \u003cli\u003e750W max output power (710W nominal) at better than 95 percent efficiency, peaking near 97, so little charge is lost to heat\u003c\/li\u003e\n  \u003cli\u003eMastervolt 3-step+ charge algorithm charges quickly and safely, even a fully flat battery\u003c\/li\u003e\n  \u003cli\u003eHandles flooded, Gel, AGM, spiral, traction, and Lithium Ion including LiFePO4, set by DIP switch or MasterAdjust\u003c\/li\u003e\n  \u003cli\u003eEngine run detection charges only while the engine turns, protecting the starter battery\u003c\/li\u003e\n  \u003cli\u003eFanless natural cooling in an IP23 aluminium housing for silent, spray-protected operation\u003c\/li\u003e\n  \u003cli\u003eMasterBus, CZone, and NMEA 2000 compatible for status, current, and alarms on your existing display\u003c\/li\u003e\n  \u003cli\u003eParallel up to ten units for well over 100A of 12V output on larger boats\u003c\/li\u003e\n  \u003cli\u003eIncluded battery temperature sensor and voltage sense keep the charge accurate at the battery\u003c\/li\u003e\n  \u003cli\u003eThree heavy M8 terminals accept 10 to 50 mm2 cable for high-current wiring\u003c\/li\u003e\n  \u003cli\u003eWide 19 to 30V input range works with all common 24V DC sources\u003c\/li\u003e\n  \u003cli\u003eBuilt-in protection against overload, over temperature, DC short circuit, and reversed polarity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Mastervolt reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the Mac Plus 24\/12-50 do?\u003c\/summary\u003e\n    \u003cp\u003eIt's a DC-to-DC converter and charger. It takes 24 volts in and delivers a properly managed 12-volt charge at up to 50 amps, using Mastervolt's 3-step+ algorithm. It's the fix for a service battery that a smart alternator won't charge properly.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it charge lithium batteries?\u003c\/summary\u003e\n    \u003cp\u003eYes. It supports flooded, Gel, AGM, spiral, traction, and Lithium Ion including LiFePO4. You pick the profile with the on-board DIP switches or through MasterAdjust.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes the Mac Plus have a cooling fan?\u003c\/summary\u003e\n    \u003cp\u003eNo. It's a fanless design that cools naturally, so there's nothing to hum in the cabin. Just mount it with clear space around the housing, ideally vertical, since it derates above 40 degrees C.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size cable and fusing does it need?\u003c\/summary\u003e\n    \u003cp\u003eIt uses three M8 terminals that take 10 to 50 mm2 cable. At a sustained 50 amps, run heavy gauge on both the input and output and fit a fuse close to each battery.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I run more than one in parallel?\u003c\/summary\u003e\n    \u003cp\u003eYes. You can parallel up to ten units for well over 100 amps of 12-volt output, which is how larger boats scale their charging.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it work with a smart or Euro 5\/6 alternator?\u003c\/summary\u003e\n    \u003cp\u003eYes. That's exactly what it's built for. It has engine-run detection and provides constant charging power even when the alternator backs off, so your service bank still gets a full charge.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the input voltage range?\u003c\/summary\u003e\n    \u003cp\u003eNominal input is 24 volts, with a working range of 19 to 30 volts. Max input current is 30 amps.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it waterproof?\u003c\/summary\u003e\n    \u003cp\u003eIt carries an IP23 rating, so it's protected against dust and dripping or lightly sprayed water. Mount it in a dry, ventilated spot, not somewhere it'll take direct spray or immersion.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with a temperature sensor?\u003c\/summary\u003e\n    \u003cp\u003eYes. The battery temperature sensor is included, along with voltage sense leads. Both help the charger compensate for temperature and cable drop so the charge is accurate at the battery itself.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I monitor it from my helm display?\u003c\/summary\u003e\n    \u003cp\u003eYes. The Mac Plus speaks MasterBus, CZone, and NMEA 2000, so status, current, and alarms show up on a compatible display. There's also a 3-color LED on the unit for a quick check.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eMastervolt Mac Plus 24\/12-50 Converter\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eMastervolt\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e81205200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e816882021381\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e4.4 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Dimensions (H x W x D)\u003c\/th\u003e\n\u003ctd\u003e10.0 x 6.5 x 2.6 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Input Voltage\u003c\/th\u003e\n\u003ctd\u003e24 V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eInput Voltage Range\u003c\/th\u003e\n\u003ctd\u003e19-30 V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMax Input Current\u003c\/th\u003e\n\u003ctd\u003e30 A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Output Voltage\u003c\/th\u003e\n\u003ctd\u003e12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutput Voltage Range\u003c\/th\u003e\n\u003ctd\u003e10-15 V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMax Output Current\u003c\/th\u003e\n\u003ctd\u003e50 A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutput Charge Current (3-Step Mode)\u003c\/th\u003e\n\u003ctd\u003e50 A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMax Output Power\u003c\/th\u003e\n\u003ctd\u003e750 W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Output Power\u003c\/th\u003e\n\u003ctd\u003e710 W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eEfficiency\u003c\/th\u003e\n\u003ctd\u003e\u0026gt; 95% (peak 97%)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCharge Characteristic\u003c\/th\u003e\n\u003ctd\u003e3-step+\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Types\u003c\/th\u003e\n\u003ctd\u003eFlooded, Gel, AGM, Spiral, Lithium Ion, Traction, User defined\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCommunication Protocol\u003c\/th\u003e\n\u003ctd\u003eMasterBus, CZone \u0026amp; NMEA 2000\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eStatus Indicator\u003c\/th\u003e\n\u003ctd\u003e3-color LED\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCooling\u003c\/th\u003e\n\u003ctd\u003eNatural cooling (fanless)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProtection Degree\u003c\/th\u003e\n\u003ctd\u003eIP23\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProtections\u003c\/th\u003e\n\u003ctd\u003eOverload, over temperature, DC short circuit, reversed polarity\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConnections\u003c\/th\u003e\n\u003ctd\u003e3 x M8 terminal for 10-50 mm2 cable\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Temperature Sensor\u003c\/th\u003e\n\u003ctd\u003eYes, included\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Voltage Sense\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eEngine Run Signal Input\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eParallel Configuration\u003c\/th\u003e\n\u003ctd\u003eYes, up to 10 units\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTemperature Range\u003c\/th\u003e\n\u003ctd\u003e-25 to 60 degrees C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNo-Load Consumption\u003c\/th\u003e\n\u003ctd\u003e\u0026lt; 2 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eProduct Video\u003c\/h2\u003e\n\u003cdiv class=\"nvn-video\"\u003e\n  \u003ciframe width=\"100%\" height=\"480\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/E_vCWz4iqsI?autoplay=0\u0026amp;modestbranding=1\u0026amp;rel=0\" title=\"Product video\" frameborder=\"0\" allow=\"accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the Mac Plus 24\/12-50 do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a DC-to-DC converter and charger. It takes 24 volts in and delivers a properly managed 12-volt charge at up to 50 amps, using Mastervolt's 3-step+ algorithm. It's the fix for a service battery that a smart alternator won't charge properly.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it charge lithium batteries?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It supports flooded, Gel, AGM, spiral, traction, and Lithium Ion including LiFePO4. You pick the profile with the on-board DIP switches or through MasterAdjust.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does the Mac Plus have a cooling fan?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. It's a fanless design that cools naturally, so there's nothing to hum in the cabin. Just mount it with clear space around the housing, ideally vertical, since it derates above 40 degrees C.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size cable and fusing does it need?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It uses three M8 terminals that take 10 to 50 mm2 cable. At a sustained 50 amps, run heavy gauge on both the input and output and fit a fuse close to each battery.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I run more than one in parallel?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. You can parallel up to ten units for well over 100 amps of 12-volt output, which is how larger boats scale their charging.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it work with a smart or Euro 5\/6 alternator?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. That's exactly what it's built for. It has engine-run detection and provides constant charging power even when the alternator backs off, so your service bank still gets a full charge.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the input voltage range?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Nominal input is 24 volts, with a working range of 19 to 30 volts. Max input current is 30 amps.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it waterproof?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It carries an IP23 rating, so it's protected against dust and dripping or lightly sprayed water. Mount it in a dry, ventilated spot, not somewhere it'll take direct spray or immersion.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come with a temperature sensor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The battery temperature sensor is included, along with voltage sense leads. Both help the charger compensate for temperature and cable drop so the charge is accurate at the battery itself.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I monitor it from my helm display?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The Mac Plus speaks MasterBus, CZone, and NMEA 2000, so status, current, and alarms show up on a compatible display. There's also a 3-color LED on the unit for a quick check.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Mastervolt","offers":[{"title":"Default Title","offer_id":44859182153821,"sku":"74091","price":495.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/74091XL.jpg?v=1785872586","url":"https:\/\/nvnmarine.com\/products\/mastervolt-mac-plus-24-12-50-dc-dc-converter-50a","provider":"NVN Marine","version":"1.0","type":"link"}