The PV7D (for Dual and Single battery banks) is a cost effective shunting regulator designed for smaller 12V Solar Only applications with a maximum solar charging current of 7A. These controllers are easily expandable to handle charging currents from 35 to 500A. We have engineered these controllers to be extremely efficient, accurate, salt water spray resistant, and very small (1.5" x 2"). It is Ideal for use in a marine environment. Use with Lead Acid AGM or Gel battery technologies. Like the NC25A, they also use only 4mA to operate the circuitry. The PV7D controllers are not to be used with outboard motors or any generator based charging system.