Display solar generation history graph on your phone or tablet's desktop. Updates periodically in the background.This is the free version of this app, the full version comes with extra widgets for a modest one-time purchase price. NOTE: Requires a Solis/Ginlong API Access Key (free, and requested via Solis support). NOTE: requires battery optimisation to be disabled on your device to allow long running periodic API requests (app will help you change this application setting).