Thank you all for the heads up ,and advice dave h and motorman007.

ive had a brief look at the powerlab 6&8 info following the links you posted motorman007 . As you mentioned ,very impressive , I havent got any prices yet ,but i see mention of $ per watt ,might be @ $200, seems very reasonable,and will look further into later .

the Hyperion 1420i ,and 720i (dc)(250w)are the same price ,$140 us ,and the 730i @$30 more.which would you buy IYO Dave h.?
regards johno.

thanks also Jim,ile probably go with hyperion ,i havent heard a bad word about them,my local HS and fellow club member has many years experience with electric and pointed me in the right direction (hyperion),the only negative being ,if there are any issues ,ie faults etc ,thers no supplyer in AUST ,so i would be up for heafty freight charges to US for repair etc.he also recomended Imax p680 (?i think) ,and LRP.because they have distributors over here.

I have 2 heavy duty truck 150cca 12v batts to use as power supply,which i can series to 24v if required. Or would it be safer for the charger getting a quallity power supply as well ?