This is the driving circuit of the diy automatic solar charge controller.
Solar panel charge controller circuit.
18 to 20v output voltage range.
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Solar charge controller specifications.
The 5v relay is the main.
7 to 14v adjustable not recommended for 6v applications max power dissipation.
Diy automatic solar charge controller step 1.
After finishing the circuit you need to set the upper and lower limits.
50w 4a 12v nominal open circuit voltage.