Make a simple and practical lithium battery charger, change the resistance of 4 ohms in the figure to change the charging current, D1 is the power indication, D2 is the charging indication and current limit. During debugging, the 6.8K resistor is replaced with a 10K trimmer resistor. When the battery voltage is monitored to 4.2V with a digital meter, the 10K trimmer resistor is adjusted.
Using Solar Panels is a very practical way to produce electricity for many applications. The obvious would have to be off-grid living. Living off-grid means living in a location that is not serviced by the main electric utility grid. Remote homes and cabins benefit nicely from solar power systems. No longer is it necessary to pay huge fees for the installation of electric utility poles and cabling from the nearest main grid access point. A solar electric system is potentially less expensive and can provide power for upwards of three decades if properly maintained.
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