That would suggest you might need to add a back - up energy source, such as solar energy panels, batteries, or a generator. (inc.com)
Silver also serves a more than useful industrial purpose and is used extensively in a growing number of manufacturing processes, including solar energy panels for example. (thecollegeinvestor.com)
Generally, solar energy panels need sun from 10 a.m. to 2 p.m. each day. (rismedia.com)