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Old 01-07-2012, 03:06 PM   #11 (permalink)
3dplane
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Look at dc to dc converters for EVs. Yes it should output 13.5-14V. The input voltage is rather high because they are designed to be fed by EV pack voltage.
Making a high voltage small capacity pack is easy but for charging it back up you would have to find an acceptable method. ( tapping into the pack by charging leads and use multiple chargers, or get the appropriate high voltage charger etc.)

Here is the first one I found on an ebay search EV DC to DC Converter Electric Car Voltage Reduce 144V volt to 13.8V 35 Amp 480W | eBay

There was also talk about diy converters on this forum too but I did not search for that.

Barna

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