George Major

Thanks Chris ,
batteries are 1288 ah @20c
yes 56,5 v was the battery voltage whilst the generator was still running this am.
almost immediately after turning generator off the voltage dropped to 50,1v
 
each Axpert is linked to 3 Strings of 3 panels of 255 watts each  so 45 panels in total
Set to charge at 10 amps per  axpert off generator
what should I use as bulk and float voltage ?
 
cheers
george

Thank you all for the advice so far.
I am moving forward ,
I have followed the setup as per video on the bmv702 as from paulF007,
I have the pi working and the icc software running.
But i do not think my batteries are charging up properly ?  I measured them this morning with a hydrometer - picture attached.
I ran on generator through last night and voltage was reading 56.5 as per viltron BMV702 pictures attached. 
10 minutes off generator batteries reading 50,1 volt ?  load was 1500 watts max.
If i read the instructions that came with the rolls battery they suggest bulk charge at 60 v ?  the axpert allows 58,4 v ?
I have attached some pictures of settings and set up.
Would be most grateful for any more suggestions ?
cheers
 
george