I think that either scheme will work. If 24V rectifier and filter, you should get 30V to 34V DC. If 12V rectifier and filter followed by a DC to DC converter, you can more precisely adjust the output voltage. In either case, the challenge will be to limit the current to around 5A. If the voltage is adjustable, then monitor the current and set the voltage appropriately. If the voltage is not adjustable, then a current regulation circuit is needed. I would search for a simple series (high power) FET circuit or buy a regulator intended for a solar or wind charging system. This would work better for LiFePO4 batteries since they do not have the bulk-saturation-float charging requirements that accompany lead acid batteries.
Gary Vander Hart
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