Quote:
Originally Posted by Daox
I think the ultimate solution is basically what mpg_numbers_buy said. You have a very small 4S LiPo pack made of power cells (cells designed to put out a lot of power) that can start your car easily. It could be quite small and light. Then, you have another pack made of energy cells (cells designed for lower power output, but usually higher cycle life) that can charge the 4S LiPo pack through a dc-dc converter. This pack would be grid charged. It would be sized as large as you need to give you the required alternator off time. Once this pack runs out, the alternator kicks in. However, (of course there is a downside) it has the complication of BOTH systems.
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If you do the balancing yourself, it really isn't all that complicated.
With a lithium battery, especially a homemade one, you will want to relocate your 12V to the cabin. Leave the DC-DC connected to the 12V, and make connections going to the larger battery that you can easily remove.
The complication would involve installing it neatly, or if you wanted to engage regenerative braking.