{"product_id":"blue-sea-systems-p12-battery-charger-7531","title":"Blue Sea Systems P12 Battery Charger 12V 25A 3-Bank – 7531","description":"\u003ch2\u003eBlue Sea Systems P12 Battery Charger 12V 25A 3-Bank – 7531\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7531\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlue Sea Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eP12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBSS-7531\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e632085075316\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSystem Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTotal Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25A continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Banks\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 positive \/ 1 negative\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAC Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUniversal 115–230V AC, 50–60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Output Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFloat Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13.5V DC (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.5A @ 115V AC \/ 2.25A @ 230V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~450W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e−20°C \/ −4°F to 45°C \/ 113°F (full rated output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecommended Bank Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60Ah min – 330Ah max (combined)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13 lb \/ 5.9 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H × W × D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12.94 × 7.80 × 4.30 in. (328.8 × 198 × 109.1 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnclosure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFinned aluminum, dry-mount, vertical mount required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat This Charger Does\u003c\/h2\u003e\n\u003cp\u003eThe Blue Sea Systems 7531 P12 is a 12V, 25A marine battery charger that independently manages up to three battery banks from a single unit. Its four-stage charging sequence — Bulk, Absorption, PreFloat™, and Float — allows each bank to progress through charging at its own pace. PreFloat™ holds a bank that has finished absorption at a reduced voltage while the remaining banks continue charging, preventing fully charged banks from being overcharged in a mixed-load multi-bank system.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e12V marine battery systems with combined bank capacity of 60Ah–330Ah\u003c\/li\u003e\n\u003cli\u003eAGM batteries\u003c\/li\u003e\n\u003cli\u003eFlooded lead-acid batteries\u003c\/li\u003e\n\u003cli\u003eGel batteries\u003c\/li\u003e\n\u003cli\u003eTPPL \/ Thin Plate Pure Lead batteries\u003c\/li\u003e\n\u003cli\u003eUser-adjustable charging profile (custom battery types)\u003c\/li\u003e\n\u003cli\u003eVessels using Blue Sea Systems ACR Charge Coordination\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Lithium battery types are not listed in the published Blue Sea Systems 7531 factory charging profiles. Do not use this charger for lithium batteries without independent verification. All connected banks must use a chemistry compatible with the selected charging profile. Confirm combined bank capacity falls within the 60–330Ah recommended range.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-stage charging with PreFloat™\u003c\/strong\u003e — protects fully charged banks while others continue absorbing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-bank output\u003c\/strong\u003e — one charger manages separate start, house, and auxiliary banks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal AC input\u003c\/strong\u003e — 115–230V, 50–60 Hz for North American and international shore power\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower-factor-corrected AC input\u003c\/strong\u003e — reduces load on shore power circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery temperature compensation\u003c\/strong\u003e — adjusts charge voltage based on battery temperature sensor reading\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUser-adjustable charging profiles\u003c\/strong\u003e — customizable for specific battery requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge LCD diagnostic display\u003c\/strong\u003e with multi-language interface (English, French, German, Italian, Spanish)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eACR Charge Coordination compatible\u003c\/strong\u003e — works with Blue Sea Systems Automatic Charging Relays\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition protected\u003c\/strong\u003e to ISO 8846 \/ SAE J1171\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompliant\u003c\/strong\u003e with UL 1236 Marine, ABYC A-31, CE, and FCC Class B requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in protection:\u003c\/strong\u003e AC over\/under-voltage shutdown with auto-restart, DC over-voltage, reverse-polarity, surge, short-circuit, over\/under-temperature\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eIntelligent thermal regulation\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/8201086140452\"\u003eBlue Sea Systems P12 Battery Charger 12V 40A 3-Bank – 7532\u003c\/a\u003e — higher-output 40A version for larger combined bank capacities up to 440Ah\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eMount vertically in a dry, well-ventilated location. Do not install directly above or below batteries. Maintain adequate clearance around the cooling fan and vents. Blue Sea Systems recommends a 30A DC circuit breaker for the DC outputs and a 10A AC breaker for typical 120V installations. Connect the battery temperature sensor to the primary or largest battery bank.\u003c\/p\u003e\n\u003cp\u003eThe 7531 integrates with compatible Blue Sea Systems ACRs to keep battery banks isolated while independently managing each bank’s charge state.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCharger no longer maintains proper battery voltage across all banks\u003c\/li\u003e\n\u003cli\u003eOne or more charging outputs fail\u003c\/li\u003e\n\u003cli\u003eCharging becomes intermittent or displays persistent fault codes\u003c\/li\u003e\n\u003cli\u003eInternal corrosion, heat damage, or physical damage is present\u003c\/li\u003e\n\u003cli\u003eUpgrading to a higher-output multi-bank charging system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eService Interval\u003c\/h2\u003e\n\u003cp\u003eNo fixed service interval. Inspect wiring connections, output studs, and the battery temperature sensor annually or whenever charging performance is in question. Confirm fan operation and vent clearance at each inspection.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan I charge different battery chemistries on each bank simultaneously?\u003c\/strong\u003e\u003cbr\u003eThe P12 applies one charging profile across the full system. All connected banks should be compatible with the selected chemistry. If banks differ significantly in chemistry or state of health, consult Blue Sea Systems before programming the charger.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is PreFloat™?\u003c\/strong\u003e\u003cbr\u003ePreFloat™ is the charging stage between Absorption and Float. A bank that finishes absorption early is held at a reduced intermediate voltage while remaining banks complete their absorption cycle, preventing overcharging without interrupting the overall charge sequence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this charger work with lithium batteries?\u003c\/strong\u003e\u003cbr\u003eNo. The published 7531 factory profiles cover Flooded, AGM, Gel, and TPPL only. Lithium is not a listed supported battery type for this model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the 7531 different from the \u003ca href=\"\/products\/8201086140452\"\u003e7532\u003c\/a\u003e?\u003c\/strong\u003e\u003cbr\u003eThe 7532 delivers 40A total output and is rated for combined bank capacities up to 440Ah. The 7531 delivers 25A and is rated for banks up to 330Ah combined. Both are 3-bank, 12V P12 series chargers with the same core feature set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this charger require a specific mounting orientation?\u003c\/strong\u003e\u003cbr\u003eYes. Blue Sea Systems requires vertical mounting to maintain the charger’s drip-resistant performance rating and ensure proper cooling airflow.\u003c\/p\u003e\n\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThe 7531 is the right choice when you need proper independent management of three 12V banks and your combined capacity stays under 330Ah. The PreFloat™ stage is the real differentiator for multi-bank systems — it stops a fully charged bank from being held at absorption voltage while another bank catches up, which is exactly the overcharging scenario that shortens battery life on boats running mixed charge states across start, house, and auxiliary banks. The most common setup issue is battery chemistry: the 7531 uses one profile across all outputs, so confirm all your connected banks are the same type before commissioning. If your combined bank capacity is closer to 440Ah or you are adding capacity, consider the \u003ca href=\"\/products\/8201086140452\"\u003e40A 7532\u003c\/a\u003e instead.\u003c\/p\u003e","brand":"WEST","offers":[{"title":"Default Title","offer_id":43629628096548,"sku":"BSS-7531","price":1080.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/BSS7531.png?v=1772228083","url":"https:\/\/marisolmarine.com\/products\/blue-sea-systems-p12-battery-charger-7531","provider":"Marisol Marine Company","version":"1.0","type":"link"}