With the addition of an external diode one can even use both sources of power, a solar panel and line power from a transformer where the AC source is a back-up source for when the sun is absent for prolonged periods. A connector is provided on the board to connect the solar panel and there is even space on the printed circuit board for the power transformer. It is recommended that the solar panel nominal voltage be at least 4 volts higher than the maximum battery voltage. For example, a 12 volt battery system will attain a maximum float voltage of 14 volts. This means the required solar panel voltage should be at least 18 volts or more.
Assembly requires screwdriver, pliers and soldering equipment.
The module can be used as a driver board to build much larger chargers. The PC board is designed so the builder can use the basic board to build a charger with off-board components for higher charging rates. Instructions are included in the manual. Operating Temperature 0 deg. C to 70 deg.