I DIYed a low-cost solar energy storage system!
Figure 2: Solar photovoltaic panels, three series and two parallel.
Figure 3: Output voltage 20V+ under afternoon sun.
Figure 4: Output voltage 17V+ at 2 PM when the sun is not directly overhead and the sun is blocked by the window.
Figure 5: The complete small solar energy storage system.
Figure 6: Input voltage of the step-down circuit, reduced to around 4.2V.
Figure 7: Output voltage of the power bank. After testing, the power bank can be charged from one bar to four bars in half a day.
The advantage of this small solar energy storage system is that you no longer need a charger to charge the power bank; only the solar photovoltaic panel is needed. It's purely green new energy, an inexhaustible source of solar energy. What do you all think? Is it great or not?
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