[al3k]

So for the battery solution Im now thinking about keeping the 12v car/crank battery, add a 6s lipo pack as a separate battery system.
Bigger capacity is better, but more expensive, Im thinking 5000-15000mah.(needs to have a C rate to support min. 250A, but closer to 350A makes it possible to run the elturbo to the limit with my motor).
Add a DC to DC converter with constant current to get from 12-14v car battery to 80-85% of the full charge lipo pack voltage, I plan to have a arduino to get the throttle input to controll the e-turbo so its only running when 90-100% torque is requested (WOT), this arduino while also trigger a solid state relay to engage the charge voltage from the DC to DC converter to the lipo pack and disconnect when the e-turbo needs to run.
This will be a constant current, constant voltage charging with priority for safty as it would only charge with 80-85% of the max total cell voltage and x/10A where x is the capacity of the lipo pack.
So since its not balance charging Im thinking of just extendig the balance plug connector into the cockpit with a cell monitor that displays each cell on a small lcd monitor OR make a arduino which reads each cell voltage with resistor dividers using analog read 0-5 which is just enough for 6 cells and it will send a message to a display showing each cell voltage and auto disable charging if a threshold of unbalance is reached. and if its gets unbalance after a X cycles I will just take out the lipo pack and balance charge it at home with a proper charger.
In my car the battery is placed close to the windshield and the compartment under the hood is separated from the engine area which makes controlling temps and having wires into the cockpit a lot easier than on some other cars.
Notes to above, having 100% charge is not a priority which would require each cell to reach 4.2v, having max around 80% will increase lifetime and safty margins of the lipopack so thats the priorty. Wire size to the e-turbo controller (ESC) needs to be correct diameter/AWG in relation to distance(wire length) and max amps of the system.
What do you guys thing about this, still unsafe or doable? I will also have the battery in a fireproof case or bag just incase and a temperature sensor to it which the arduino will monitor.