supersignman
Photons_into_electrons
I'm wondering if these cells from Battery Hookup could be a legit LiFePO4 car battery replacement?
https://batteryhookup.com/products/new-case-with-6x-3-2v-74ah-lifepo4-prismatic-cells
They were originally intended for 12V starter batteries and have a 600A discharge rate for 10 seconds which should be enough for most cars. You might need to put multiple banks in parallel for a diesel truck though. At $30 ea. x 4 = $120, you're looking at the same price the average lead acid car battery costs these days (and some are way more than that) but these should last 20+ years where an average lead acid car battery is scrap in 5 years.
I realize the big drawback is low temp charging in cold climates though. You would need some sort of heat wrap around it in those situations but if you're in an area where it doesn't get below freezing at night, would this work? I'm guessing you'd probably need some 1"x1/4" thick copper bus bars between cells to handle that much current but those would be easy to make from a piece of flat bar.
The other thing I'm thinking about is the availability of car batteries during a time of war or during a time of hyperinflation. As expensive as they are now, what will they be then? In that situation, you could just make sure you didn't drive the car when it was below freezing if you didn't have a way to heat the cells. The other great thing about these cells is that you could use them in your solar storage bank until you needed them in your car because they work out to only $.12 per watt hour.
I regards to a BMS, from what I gather, you could wire them so they could discharge without the BMS and charge with the BMS. In a crisis situation, I'm thinking you might not even worry about a BMS. If you checked the cells and top balanced them every few months, would you even need a BMS? I would think the average car alternator would provide the correct voltage to charge these since their full voltage is only slightly above a standard car battery (3.2V x 4 = 12.8V).
https://batteryhookup.com/products/new-case-with-6x-3-2v-74ah-lifepo4-prismatic-cells
They were originally intended for 12V starter batteries and have a 600A discharge rate for 10 seconds which should be enough for most cars. You might need to put multiple banks in parallel for a diesel truck though. At $30 ea. x 4 = $120, you're looking at the same price the average lead acid car battery costs these days (and some are way more than that) but these should last 20+ years where an average lead acid car battery is scrap in 5 years.
I realize the big drawback is low temp charging in cold climates though. You would need some sort of heat wrap around it in those situations but if you're in an area where it doesn't get below freezing at night, would this work? I'm guessing you'd probably need some 1"x1/4" thick copper bus bars between cells to handle that much current but those would be easy to make from a piece of flat bar.
The other thing I'm thinking about is the availability of car batteries during a time of war or during a time of hyperinflation. As expensive as they are now, what will they be then? In that situation, you could just make sure you didn't drive the car when it was below freezing if you didn't have a way to heat the cells. The other great thing about these cells is that you could use them in your solar storage bank until you needed them in your car because they work out to only $.12 per watt hour.
I regards to a BMS, from what I gather, you could wire them so they could discharge without the BMS and charge with the BMS. In a crisis situation, I'm thinking you might not even worry about a BMS. If you checked the cells and top balanced them every few months, would you even need a BMS? I would think the average car alternator would provide the correct voltage to charge these since their full voltage is only slightly above a standard car battery (3.2V x 4 = 12.8V).