all depends on budget I guess, how much do you have to spend on the "right" generator and converter?
if money's no object, wire them as a 48 volt system and run a pair of Magnum 4248 hybrid inverter chargers ... 250 amps at 48 volts (typ), run a small 30 amp 12v converter off the inverter for your 12v loads, or get a DC-DC converter.
alternately, you could use 2 or 4 standard 100 amp 12v converters, I think some of the nicer ones let you slave them together, with a control panel to force them into absorb mode
edit: forgot the time ... the magnum solution should recharge your bank from dead to full in about an hour, provided you can supply 30+ amps AC to the chargers. going the converter route 2-4 hours depending on how many converters you use and how well they parallel together.
