inverter/charger, combo or seperate

[dakno]

HELLO My 3 yr old Pro Mariner 1220i has failed . This was a 3 bank multi stage charger new in box bought on-line at a good price (great while it lasted, and by the way it started making a rattling noise, similar to a fan hitting something, which wasn't the case because the fan wasn't running}, 20 amp capacity. I also have a xantrex 1000w inverter in the loop. I have 3 gp24 lead -acid batts for a house bank, and I had the output from the 3 charging post on charger jumped together for 1 charging lead of 20 amps with the + lead at one side of bank and the - lead going to the opposite end of bank. I rely on engine alt to keep starting batt charged and yes there is a switch between starting batt and 3 house batts. ?, should I remove/replace charger, or, remove charger and inverter and install a new charger/inverter combo, thus reducing the space and wiring clutter ( a 27' boat ). I would also like something to tell me the charged levels of my house bank. As of now I use the volt reading on my chart plotter to tell me the available voltage. Any insight or suggestions would be greatly appreciated.