When charging a battery one shouldn't charge the battery with any more than 5-10% of the batteries Amp/hour capacity if the batteries ampHour is 255 then the battery should recieve no more than a 25Amp/hour charge.
A battery should not discharge more than 0-20% of the batteries amp/hour capacity.
Which means that one or more appliances should not draw more than 55Amp/hours from the 255Amphour battery.