What Charger?

[Charlie]

Hi All:

I'm looking for a battery charger for my boat. It will be run off of a 3.5 KW generator and/or off of shore power. It will be charging a bank of 4 6v batteries. It is possible that I might add another 2 batteries in the future. I would like the charger to have temperature sensors. I plan on using the alternator to charge the starting battery and the generator battery. I'm thinking that one of these chargers that will allow multiple moduls to increase the charging capacity would be a good idea. My theory is to use the generator as the main charging system for the boat and the engine alternator as a back up. Can any of you guys let me know what brand works for you and why.