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In this video, I'm going to walk you through the process of charging your lithium iron phosphate (LiFePO4) batteries directly from your vehicle's alternator. This idea was sparked by a friend's van conversion project, aiming to efficiently power his house battery via the alternator. We'll dive into the essentials of using a DC to DC charger for this purpose, highlighting the critical differences between isolated and non-isolated chargers, and why it's pivotal for safely charging lithium batteries with your car alternator.

Understanding why a DC to DC charger is crucial forms the backbone of our discussion. Alternators are traditionally designed for lead-acid batteries, which have a vastly different charging profile compared to lithium batteries. The lower internal resistance of lithium batteries means they can draw higher current, potentially leading to issues if charged directly by the alternator. I'll explain how a DC to DC charger acts as a mediator, allowing your alternator to safely charge a lithium battery by regulating the current flow from your starter battery.

We'll explore several reputable brands like Renogy, Victron, and Litime, offering top-notch DC to DC chargers perfect for charging lithium batteries while driving. I'll share my experience with different models, including a cautionary tale about selecting the right type of charger—emphasizing the importance of choosing a charger specifically designed for your setup.

The video includes a detailed wiring diagram for connecting your DC to DC charger, using a Renogy model as an example. Tips on minimizing voltage drop, selecting the proper fuse sizes, and the advantages of wiring your charger through a switch for greater control and efficiency will also be covered. This setup is particularly useful for those who might alternate between alternator charging and shore power, aiming to conserve fuel and reduce wear on your vehicle's alternator and belts.

Additionally, I'll tackle the often-asked question about the differences between isolated and non-isolated DC to DC chargers. The choice between them can impact efficiency, cost, and the safety of sensitive electronics in your system.

To debunk myths and clarify misconceptions, I'll discuss a Victron test that highlights potential issues with charging lithium batteries directly from an alternator without proper current regulation. Plus, I'll share insights on how to properly size your DC to DC charger in relation to your alternator's output to ensure longevity and reliability of your charging system.

If you're curious about how long it takes to charge your battery with an alternator and a DC to DC charger, I've got you covered. We'll break down the math to give you a clear understanding of charging times, ensuring you can plan your travels without worry.

This video is packed with information for anyone looking to charge their lithium battery from a starter battery, especially for those on the move. Whether you're driving to your next adventure or powering your off-grid setup, understanding how to efficiently charge your lithium batteries with your vehicle's alternator is key.

Your feedback and questions are invaluable, so please share your thoughts in the comments below. Have you used a DC to DC charger in your setup? Share your experiences and let's help each other out.