Quote:
Originally Posted by Ryland
Look under the hood and on every single hybrid and pure electric car you will find a lead acid battery that runs the lights, that lead acid battery is kept charged via a DC to DC converter off of the main battery pack.
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My mistake, I thought the discussion had turned to using lead acid batteries for an EV's power system. Your correct almost every vehicle manyfacturer uses a lead acid battery, for secondary systems power.
A secondary battery is required, so that if the main battery shorts out for any reason, the hazard lights, brake lights and such will continue to function.
But just because your Tesla or new Nissan comes from the factory with heavy lead acid battery doesn't mean you can't swap it out for better energy chemistry and lighter package technology.
Remember, the OEM's do not put the very best into their cars.
They put the cheapest materials that they can into their vehicles to maximize profit.
Does that mean that the main battery in a Nissan or Tesla is poorly designed? No,..
But, it means that they will pick the cheapest battery technology they can for the 12V secondary system.
Example:
my VW Jetta has a 72 month group 48/H6 battery
Ratings:
CGA - 570A
MCA - 650A
RC - 115Min
Ah - 70Ah
Weight ≈ 40 lbs.
I can connect 3 or 4 LiFePO4 batteries to get enough cranking amps AND enough Ah capacity. This battery pack will still be smaller in size and weight less than 10lbs.