# Solar Powered Remote Control cars

Solar vehicles tend to be *actually* tough because solar power panels are ineffective.

The power in sunlight varies by latitude, weather condition, and time. On a definite day, at solar power noon, at equitorial latitudes, solar energy at world's area may be slightly over \$1000\:\mathrm{W/m}^2\$. However, it's much lower at other times of the day and latitudes. For a lower bound, the WMO defines direct sunlight as anything above \$120\:\mathrm{W/m}^2\$. Clouds and smog naturally can mean even less.

So let's assume this automobile is large enough to support a panel how big an A4 sheet of paper. That's \$210\:\mathrm{mm}\cdot 297\:\mathrm{mm} \approx 0.06\:\mathrm m^2 \$ of location accessible to gather light. Simply how much energy is readily available? Inside worst situation:

$$ 0.06\:\mathrm m^2 \cdot 120 \:\mathrm{W/m}^2 \cdot 0.15 \approx 1W $$

Inside best case:

$$ 0.06\:\mathrm m^2 \cdot 1000 \:\mathrm{W/m}^2 \cdot 0.15 \approx 60W $$

Exactly what do we do with about one watt? Perhaps it's best to compare toward battery pack into the car. It appears to be just like the 7.2V battery pack packages used in numerous RC automobiles has actually a capacity of \$3000\:\mathrm{mAh}\$ (three amp-hours). We can get a very rough notion of the sum total power because pack by multiplying the current because of the capability:

$$ 7.2\:\mathrm V \cdot 3\:\mathrm{Ah} \cdot {3600\:\mathrm s \over 1\:\mathrm h} = 77760\:\mathrm J $$

A watt is certainly one joule per second. Therefore, the price of power available from the cell is about the same as if you exhausted that electric battery continuously during a period of 77760 seconds or 21 hours. Just how slowly could you must drive that vehicle to make the battery packs final 21 hours? That is how fast it may go with the price of power available from the solar power.

Utilising the best case of 60 watts is notably more positive, but it's a fair guess you will need the vehicle to the office within just maximum problems. Used naturally you'll get something in the middle.

With careful engineering you will get a thing that works, but it is never ever likely to zip around like a battery-powered automobile can. It can help a lot to point the panels directly within sunshine, but to keep them directed within sunshine whilst the vehicle drives would require an extremely complex procedure. You additionally'd most likely want to undergo every part of the automobile and then make it because efficient as you can. Minimize rolling resistance regarding tires. Reduce any transmission losings. Make use of a rather efficient motor. Make the automobile as light as you possibly can, etc.

These are rough computations, naturally, but serve to demonstrate the purpose: solar automobiles are *tough*. When they had been simple, everyone else would-be operating them.

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