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Directly coupling a low-voltage DC device to the low-voltage DC power produced by a solar panel avoids these energy losses and results in a more energy-efficient system. Practically, you can power the same device with a smaller solar panel. However, this implies that you use low-voltage appliances.
Omitting the inverter has lots of advantages. First, it makes solar installation cheaper because inverters are expensive. Second, it makes the solar power system more energy efficient. Converting low-voltage DC power to high-voltage AC power involves energy losses as high as 50% for small-scale solar installations.
The biggest drawback of low-voltage power is its relatively high energy loss during transmission, especially for powerful devices. Therefore, the power outlets are as close as possible to the rest of the solar system. Install multiple systems rather than a centralized system with many meters of distribution cables.
Small-scale solar is decentralized power production taken to its extremes. Most of the work in building a small-scale solar system is deciding the size of the components and the building of the supporting structure for the solar panel. Wiring is pretty straightforward unless you want a sophisticated control panel.
Wiring a direct solar system without battery storage is straightforward. If there is no DC-DC converter, screw the + and the - of the solar panel to the + and the - of the appliance. Put a fuse in between. Optionally, add an on/off button. Make sure the device you power can take the voltage that the solar panel supplies to it.
Of course, you need an on-off switch to close the circuit. The biggest drawback of low-voltage power is its relatively high energy loss during transmission, especially for powerful devices. Therefore, the power outlets are as close as possible to the rest of the solar system.
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