Possible alternative to alternators (plug in)

[im45pl]

Just throwing this out there, after speaking to mike singer it looks like the biggest alt for my van i can get is going to 250 amps. While probably ok for driving around at low volumes i need to come up with a solution for long demo sessions at shows, so something that can plug into mains power (240 volt) i have found some big power supplies but as the are just a power supply i am guessing they will fuck up my batteries pretty quick.

so what options are there, or am i looking at running multiple smaller charger like the xs power 60 amp unit?

rest of the electrical at this stage is 12 x agm group 31 batteries and maybe adding another 6 later on... running 4 dc 5.0k and around 2k of front stage

are lithium ion batteries an option at all for this? at least from a fast charging point of view i can run them down then charge them quick and demo again... just thinking out loud on that one

cheers

[im45pl]

maybe something like these?

http://www.chargingchargers.com/powermax/pm3-100-battery-charger.html

what do i need to look for in a charger or power supply?