I PowerFilm® Module Polarity Information
It is extremely important to recognize the correct polarity of the PowerFilm® modules!
The
positive end of the solar module is shown in the diagram below. A diode, such as 1N5817, is
recommended to prevent the solar module from draining the battery when the solar module is in
the dark. A diode is not required for a battery-free electrical device. The positive end of the
module connects to the positive end of the load. The negative end of the module is also shown in
the diagram and should be connected to the negative end of the load. The recommended
connector wire size is a minimum size of 24 gauge. As an extra measure, connect the solar
module to a digital multimeter for polarity (+,-) identification. On solar modules with copper tape
leads, remove a small piece of the clear coating that is on top of the copper tape to ensure good
contact between the alligator clips of the digital multimeter and the copper tape.
Warning! Do not connect a charged battery backwards or reverse polarity to the solar
module, this will destroy the solar module and may cause the battery to explode causing
bodily harm, even death!
II PowerFilm® Module Selection
Select PowerFilm® modules according to 1) Operating Voltage and Operating Current Required,
2) Use Environment, and 3) any Specific Applications Needs.
1. Module Selection: Operating Voltage and Operating Current Required
Identify the Operating Voltage and Operating Current that your system requires. For direct
powering devices, calculate the requirements of the total system.
For charging batteries, see the notes below:
DO NOT CHARGE ALKALINE BATTERIES. THEY ARE NOT RECHARGEABLE.
CONTACT YOUR BATTERY MANUFACTURER FOR CONFIRMATION THAT YOUR BATTERY
IS APPROPRIATE FOR YOUR SYSTEM WITH THE SOLAR MODULE.
Charging Batteries: Voltage
First, select the required Operating Voltage of the solar module for your load. As a general rule of
thumb, a solar module with an Operating Voltage of 3-3.6 volts will charge 2 AA rechargeable 1.2
volt batteries. A solar module with an Operating Voltage of 7.2 volts will charge 5 AA
rechargeable 1.2 volt batteries or a 6 volt gel or lead acid battery. A solar module with an
Operating Voltage of 15.4 volts will charge a 12 volt gel or lead acid battery.
