Choose the amount of voltage that you wish to store for your homemade solar setup. If you are storing solar power for running a small portion of your home usage, then choose as many 6-volt golf cart batteries as you require to meet your power needs. One golf cart battery will store enough energy to run two 50-watt incandescent light bulbs for 10 hours.
Use L-16 traction batteries for running more power in the house. These batteries are 350 amp hours as opposed to the golf cart batteries, which are only 220 amp hours. Being industrial, they are more difficult to find, but they are superior for storing solar power because they are made to handle deep charge and discharge cycling.
Designate a section of a stand-alone building, such as a workshop or a garage with a cement floor, for storing your solar batteries. Make sure that you can maintain a temperature between 50 and 80 degrees Fahrenheit. Otherwise, you run the risk of losing 50 percent of your stored solar power. This building should also have a stable water supply so that any leaks can be absorbed with baking soda, and then hosed down with water.
Place a shelving unit --- which can be made from wood or metal or can even be a boot rack --- in the corner of the building that has the greatest temperature stability and is farthest from any traffic. This will protect the batteries and any visitors to the building. Place all the batteries you have determined you need on the stand about 6 inches apart from each other.
Wire the batteries together with the copper wire to create a pack or bank. Put on the protective eye goggles and acid-proof gloves when you are working on the batteries. They are extremely volatile. Run the copper wire from the positive of one battery to the positive of the next and the negative of one to the negative of the next. Wrap the wire around the post using the needle-nose pliers and cut using the cutters on the inside of the blades, close to the handle.