A 55 amp charger will recharge a low battery bank quicker. You will need the proper gage wire for 55 amp, usually a 6 to 4 gage depending on type of insulation on the wire.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7