Unlike solar, for which there are numerous loan financing options, the number of options available for storage are more limited. Typical options like home improvement loans and home equity lines of credit are available for use. Some solar loan providers, like Mosaic, offer financing for storage as well. If you have PACE (Property Assessed Clean Energy) financing available in your area, this may also be available for storage. In some areas third-party owned systems may also be available. Under these arrangements you get the use of the battery system for backup power and the battery owner uses it to provide grid services to the utility. This kind of arrangement is still very new and not yet widely available. Ask your installer about financing options they can offer from the manufacturer or from third-party financiers and compare them to what you can acquire on your own.