45 Amp 12V volt to 24 volt DC/DC battery charger for lead acid, lithium ion and lithium iron phosphate batteries (common negative) 1300 Watts Robust, marine, heavy duty from PowerStream.
TJM 12-24V 25A DC Battery Charger – Thrashed Off-Road
Amazon.com: Renogy 12V 40A DC to DC On-Board Battery Charger for Flooded, Gel, AGM, and Lithium, Using Multi-Stage Charging in RVs, Commercial Vehicles, Boats, Yachts, 40A : Automotive
Renogy 480-Watt 12-Volt 40 Amp DC to DC On-Board Solar Battery Charger RNG-DCC1212-40 - The Home Depot
Dual Input 40A In-vehicle DC Battery Charger - REDARC