absolutely
golf cart type flooded lead acid batteries give you the biggest bang for the buck. If they are less than 1 year old and have not been abused(left sitting for a period of time deeply discharged)you can just add another parellel string(s) and increase your AH capacity. Use the same brand and size of battery, don't mix battery size or type. The fewer parallel strings you have, the less you potential problems you will have. A couple of potential problems with flooded batteries vs. sealed batteries, Tie them down real good and put them in some type of container. battery acid spills suck. Use a GOOD regulated 3 stage charger with ajustable setpoints on the different stages. set your setpoints to manufacturers specs. I like to run my setpoints 2 tenths of a volt(12 volt system) below that to reduce gassing in flooded batteries. Overcharging flooded batteries produces hydrogen gas. If you smell hydrogen sulfide (rotten eggs) during normal charging, less than 14.4 volts or less, its time to replace the batteries.A great website to learn about different types of batteries and charging systems is homepower.com. It is for off grid homes and such, which is what I do. Ross