Hi Rob, you have a fairly interesting setup.
The charging figures for the trojans are exactly that. Charge the battery up to 14.8 volts and it is full, you then float the battery at 13.2 volts if it is not supplying any power. The equalising charge to 15.5 volts should only be done after the batteries have delivered a certain amount of ah's. This is pretty much the same as a gwiz battery pack, but with twice the capacity.
What sort of charge controller are you going to use to charge the pack? I would have thought that with a fairly small continuous charge that a solar or wind charge controller could do a good job. What will you do once that batteries are fully charged with your generator - switch it off, or have the power switched to a dump load or something?
What size invertor are you using to convert your 48 volts to house mains? Have you considered what your peak load might be in your house? I have measured it in ours and I have to say with some combinations we have hit 6kw - but that does include having my electric car plugged in as well
You have to think of a battery as a muscle - keep it well used and excercised and it will work well. Your pack came from an electric car with a powerful contoller which would have hammered the batteries with massive current draws. Do you know how many miles they were driven for? A gwiz with a 48 volt 200ah pack will do on average 7000 miles before the range drops considerably, but some people get alot more than this as they drive them extreemly gently.
Be interesting to see how you get on with them.