The Battery Operated SPI-MV Convertor from Singer Valve can run independently of an external power source for 3-5 years. It can also be paired with an external AC or DC power source so the battery portion becomes a backup when power outages occur. A small solar panel can be added to extend the lifetime to 10-15 years. Comes in the standard 3-key touch local convertor with Die Cast Aluminum IP67 housing. It has variable sampling frequencies that can be adapted to fit the installation needs. Options include dual totalizer pulse output and internal data logging.