What is the best type of charger for a BEV?
One that is high power >= 3 kW but also isolated, power factor corrected, UL and FCC compliant. 47. How do you determine the state of charge of the batteries? The voltage, temperature and cumulative amp hours extracted from the batteries can be used to predict the state of charge. 48. How can you predict the range of a BEV conversion? There are calculations in books, but here is an example of a rough empirical estimate, based on vehicle weight and MPG. A ~3000 lb DC rear wheel drive 1966 Mustang convertible used to get ~20 MPG, and now goes ~40 miles on a ~15 kWh 400 lb pack of LiFePO4 with the same curb weight, or about 2.7 miles per kWh. It would cost about $10K for Thunder Sky batteries and an eLithion BMS and last at least 5 years, so $2K/year or ~$5 per day battery amortization and ~$1/day to charge, assuming 20 miles per day or ~7000 miles per year driving. So writing off everything in the conversion except for the batteries as a rebuild, this “pays” when gas goes above $6/gallon
