Crazy ideas

Started by specing, February 24, 2015, 03:34:45 PM

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If LiFePo4 chemistry is chosen for the external battery pack (or some other with high discharge),
there should be a way to start your car with it in emergencies.

A 3-cell 100Wh LiFePo4 battery pack with 30C discharge (max) provides
100 / 3 cells / 3.6V nominal  * 30 times-discharge provides 277 amperes of
current or 3000 watts at 3*3.6 = 10.8 V

Problem: how to block current from coming from the lead-acid battery and/or the alternator from
charging the battery (One does not simply charge li-ion)? High-power low-drop diodes?