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I have been following this thread and like the ideas you have. I have the same car and want to do the same things with the alt. cut off switch. I have the same commute as well. 50 miles. Just to get things straight, are you going to add in the 40AH 12.8V LiFePO4 pack to the system seperate from the main battery or in parallel?
When you switch the alt. off everything but the starter is still powered through the Lifepo4, right? So assuming the specs are accurate you could drive on good enough voltage for your whole trip without having to recharge the battery or use the alt. and then charge it overnight at home, right?
I am curious as to whether this method is better than just adding a second car battery in parellel? It seems like you can EOC for as long as you need to with that setup but can it last the entire trip without using the alt?
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