T&T: Size of Solar Charger to maintain Batteries

[Joe Urban]

I need to size the correct solar charger for my boat this winter.
 I have the following batteries  --   4 6 volt golf carts ( 400 ah )
 1 - group 31 starting batter
 1- group 27 starting battery.
Was planning to last all together and then run charger into all of them unless
a reason no to do that -- how may watts or millaamps do I need?

Joe Urban
Punches - Monk 36