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what kind of specs do you need?
The easy option that I see is taking a cheap ($300) off the shelf 20amp inverter that has a 48v input, using a step up transformer to get you to the 144v needed or even tweaking it's voltage regulator to give you that 144v output then rectifying it.
otherwise I think some of the open source battery chargers that are large switching power supplies take a DC input and can give a wide range of outputs.
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