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100 amp 24 volt alternator engine load12/9/2023 Victron post on charging lithium batteries with alternators The environment with the alternator sitting close to a hot engine will not be as good for the alternator as in the tests. Keep in mind that in the Victron tests the alternator sits on a workbench surrounded by nice fresh air. In this article, they end up using a different type of protection of the alternator then us. The Victron blog has a great article and video about this and how the small case alternators overheat. With a small case alternator running at max, it’s a high risk that it would overheat, especially at low RPM, since the internal cooling will not be as effective at these low RPM:s. This might not be an issue if you have a small battery, and you don’t charge your battery with the alternator at low SOC values (State of Charge). This causes the alternator to deliver the max charge current until the battery is fully charged. ![]() Since lithium batteries have such a low resistance, the lithium battery will take all the charge current the alternator can deliver. With lead-acid batteries, the alternator would not run on max all the time. The small automotive alternators fitted on yacht engines are not made to handle lithium batteries in several different ways. Protecting the alternator from overheating But it is still important to know the risks and decide what is best for you. But regardless, it is good to consider these topics even if you end up deciding not to change anything regarding your alternator when switching to lithium batteries.Ī lot of people are not changing anything regarding their alternator when switching go lithium and it works fine for them. To keep things simple and cheap, not everything that we did might be right for you. But we also wanted one more fail-safe way of charging our batteries using the alternator. Our primary source for charging the batteries will be solar panels. Lithium batteries also have the potential to damage the alternator since most alternators are made for lead-acid batteries. ![]() But this source also needs to be refilled. With lithium batteries, we have a great source of power.
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