The input diode can be replaced with a schottky diode for better performance. I chose these potentiometers because they are much easier to make fine adjustments when calibrating the circuit. The four 10k 15-turn trimmer potentiometers may be replaced with single turn potentiometers or fixed value resistors. You can generally find them cheaper online. However, all of them may be substituted for other parts with similar values. x 16 guage wire Jumper Wires Optional Charge Controller Materials: Diode (Radio Shack #276-1103) 555 timer IC (Radio Shack # 276-1723) 0.1♟ 15V Capacitor (optional) MPS2222A NPN Transistor (Radio Shack #276-2009) IRF510 MOSFET (Radio Shack # 276-2072) 2 x 10K-Ohm 15-Turn Cermet Potentiometer/Trimmer (Radio Shack #271-343) 100-Ohm Resistor (Radio Shack #271-005) 330-Ohm Resistor (Radio Shack #271-012) 1K-Ohm Resistor (Radio Shack #271-004) 12VDC/125VAC 10A SPDT Mini Relay (Radio Shack #275-248) Tools: Soldering iron and solder Screwdriver Multimeter Crimping tool (for quick disconnects) Drill and Drill Bits Wire Strippers Knife Part Substitutions: I chose these parts because they are easily accessible (most can be purchased from Radio Shack). I would really appreciate the feedback.Ĭontrol Circuit Materials: Printed Circuit Board (Radio Shack #276-170) 2 x Diode (Radio Shack #276-1103) +5V Fixed-Voltage Regulator (Radio Shack #276-1770) 555 timer IC (Radio Shack # 276-1723) MPS2222A NPN Transistor (Radio Shack #276-2009) IRF510 MOSFET (Radio Shack # 276-2072) 100♟ 15V Capacitor (optional) 2 x 0.1♟ 15V Capacitor (optional) 2 x 10K-Ohm 15-Turn Cermet Potentiometer/Trimmer (Radio Shack #271-343) 100-Ohm Resistor (Radio Shack #271-005) 330-Ohm Resistor (Radio Shack #271-012) 1K-Ohm Resistor (Radio Shack #271-004) 12VDC/125VAC 10A SPDT Mini Relay (Radio Shack #275-248) 12VDC Vehicle Power Accessory Outlet (Radio Shack #270-046) Project Enclosure (6x3x2") (Radio Shack #270-1805) 2 x bolts (1/4" or smaller) 2 x nuts (1/4" or smaller) 2 x 1/4" Fully Insulated Female Quick Disconnects (Radio Shack #64-3133) 2 ft. So if you have any questions, problems or suggestions please leave a comment. I am still trying to make improvements to the design. This lets you build a system that fits your energy needs and your budget. This design is set up for outputs of up to 75 watts, but by swapping out parts for ones with higher power ratings you can power larger appliances or multiple smaller appliances at the same time.
But most importantly the system is scalable. It can work with any power source that is capable of charging a 12V battery (examples: wind turbines, bike generators, etc.). This design doesn't require any modification to the appliance or your home's electrical system. Then when the battery's voltage drops too low, the circuit automatically switches the appliance back to grid power until the battery is recharged. When the battery is fully charged, the circuit automatically turns on a power inverter and switches the appliance from running on grid power to running on the energy stored in the battery. Here is how it works. A solar panel (or any other renewable power source) charges a storage battery. A control circuit continuously monitors the battery's voltage. This project is a simple and cheap way to integrate renewable energy into your home by turning your appliances into solar electric hybrids.
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