CirKits SCC3-e1 12V Solar Charge Controller Alignment Instructions Work with the board mounted on a non conductive surface, or mount the board permanently to a metal plate using spacers. You will need a 12V rechargeable battery, a solar panel and some sun, the assembled charge controller and a volt meter. Make sure that the battery and solar panel are connected with the correct polarity. Use Red + wire / black - wire. CAUTION: the first time the board is connected to the battery, it is advisable to make a brief connection to be sure that there are no high current shorts from the soldering job. Rechargeable batteries have the ability to produce large amounts of current, short circuiting batteries can cause fires. Remove metal jewelry when working with batteries. Be sure that there is no exposed wiring when the system installation is complete. Customer assumes all liability for any damages. []Connect the board's BAT - terminal to the battery - terminal. []Connect the board's BAT + terminal to the battery + terminal. []Connect the board's PV - terminal to the solar panel - terminal. []Connect the board's PV + terminal to the solar panel + terminal. []Point the solar panel toward the sun. []The bicolor LED should light up as the sun shines on the solar panel. The LED can be off, red, or alternating red and green. Shade the LED from direct sunlight for best visibility. []Before proceeding with the alignment, read forward to the SCC3 Board Operation section and familiarize yourself with the LED states. []Measure the connected solar panel's voltage with the meter. []Measure the battery voltage with the meter. The solar panel must be at a higher voltage than the battery for the circuit to charge the battery. If the battery voltage is below 7V, you may need to externally charge the battery. Once charged, the battery should always be kept above 10V or short life will result. []Turn the equalize switch off (closest to the board edge). []Turn the potentiometer, VR1 25 turns clockwise, The LED should be red. []Turn VR1 counter-clockwise until the LED starts blinking red and green. The battery voltage is now at the float voltage setting. []While measuring the battery voltage, adjust VR1 clockwise to align the float voltage set point. If the LED turns red before it reaches the desired float voltage, the battery will need to charge for a while. You may need to repeat these two steps as the battery charges up. []When the battery is fully charged, it should be at the float voltage and the led should alternate red and green. []The float voltage should be set when the board and battery are at room temperature. Typical 12V set points are 13.8V for a gell cell battery and 14.5V for a wet cell battery. Follow your battery manufacturer's recommendations for the optimal float voltage setting. []Adjust the float voltage again, after the battery has become fully charged and the LED is mostly green with occasional red flashes. That completes the alignment of the SCC3.