{"product_id":"bb123665","title":"Sterling Power Saturn BB123665 | 12V\/24V to 36V 850W Bidirectional DC-DC Battery Charger","description":"\u003cp\u003eThe BB123665 is Sterling Power's Saturn Series DC-DC charger for 36V lithium and lead-acid battery systems — a purpose-built solution for overlanders, van builders, and expedition rigs running a 36V house bank charged from a 12V or 24V alternator. With 850W of continuous output and Sterling's proven Saturn platform, it handles the voltage step-up cleanly while protecting both your alternator and your batteries.\u003c\/p\u003e\n\n\u003cp\u003eLike all Saturn Series chargers, the BB123665 auto-detects whether it's connected to a 12V or 24V source — no configuration needed when switching between vehicles or power sources. It's fully compatible with Euro 5\/6+ smart alternators that use variable voltage regulation, making it the correct choice for any modern vehicle where a traditional relay or older-style charger would cause alternator faults or fail to charge at all.\u003c\/p\u003e\n\n\u003cp\u003eThe BB123665 delivers a proper 4-stage charge profile (bulk, absorption, float, and equalization for lead-acid) with six preset battery type profiles covering gel, AGM, calcium, open lead-acid, and two lithium profiles. Low-temperature lithium cutoff protects LiFePO4 cells from charging damage in cold conditions. At 96% efficiency, very little energy is lost as heat, and the unit runs a thermostatically controlled variable-speed fan that only spins up under load — quiet at rest, active when it matters.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBidirectional Reverse Charging:\u003c\/strong\u003e When your 36V house bank climbs above threshold, the BB123665 automatically feeds current back to your 12V or 24V starter battery to maintain it at a healthy float voltage — so if solar is looking after the house bank while the rig sits, your starter is looked after too. If the starter ever drops too low to turn the engine over, Jump Start Assist mode forces the reverse charge to run for 20 minutes to get you back in action.\u003c\/p\u003e\n\n\u003cp\u003eOutput can be set to 100%, 85%, or 65% via the optional BBR remote — useful for dialing back alternator draw when solar is contributing, or when running multiple BB units in parallel for additional capacity or redundancy.\u003c\/p\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e BB123665\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 12V \/ 24V auto-select\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 36V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous Output:\u003c\/strong\u003e 850W\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEfficiency:\u003c\/strong\u003e 96%\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e Thermostatically controlled variable-speed fan\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 200 x 130 x 56mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1kg\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart Alternator Compatible:\u003c\/strong\u003e Yes (Euro 5\/6+)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBidirectional:\u003c\/strong\u003e Yes — reverse charge + Jump Start Assist\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemote:\u003c\/strong\u003e Optional BBR remote for output adjustment\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STERLING POWER NORTH AMERICA","offers":[{"title":"Default Title","offer_id":48360403534016,"sku":"BB123665","price":575.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0525\/3188\/8320\/files\/BB123665.webp?v=1780512283","url":"https:\/\/overlandkitted.com\/products\/bb123665","provider":"Overland Kitted","version":"1.0","type":"link"}