hey there Hernando, old champ, you don't give up do you ?
"GET A PFC" yes sir, right away sir, money of course no object... we'll get one ordered in immediately. The caps lock key is just to the left of the 'a' on my keyboard, if you press it once the little led thingy on the top right of your keyboard will go off and you will no longer need to hold down the shift key to get regular letters.
PFC = power factor corrected iirc
48 volts output is not going to do much battery charging now is it, when the batteries themselves are at 48 V there will be 0 flow... So you need a bit more, possibly quite a bit more, especially if you plan to do equalization charging from the mill. Not usual for a 48 V DC out supply to be 'adjusted' up another 12 volts. That's why the original poster asked for something that would do 60 Volts, which is not equal to 48 Volts.
Isn't that what mppt is about anyway ? oh what am I thinking, you're an expert in the field.
So, how about this then, you go do some hunting about where you can get a 120V DC to 48V DC +- 12V PFC regulated power supply, in the 2 KW range. I'm sure that's a run off the mill item you can go and buy in any store but strangely enough I can't seem to find any after a good bit of searching. DC to AC in that power range is fairly common, but DC 120V down to 48V is not all that common, if it is commercially available at an affordable pricepoint at all.
Have you apolgized to TomW yet ? It really is not going to go away until you do you know...
lost the link ? Here, let me help you: http://www.fieldlines.com/story/2007/9/15/154035/292