China 10 Watt Foldable Travel Solar Panel: Finding Out the Real Possibilities.
A modern real tourist (who walks with a backpack, and not who sits in a foreign all-inclusive hotel) on a hike vitally needs electricity. First of all, it is needed to recharge the smartphone and / or navigator, secondly, to maintain the viability of flashlights, and thirdly, for everything else. In especially difficult campaigns, it may be necessary to recharge satellite communications and rescue equipment (they must be in constant combat readiness, and it is very good if they are not required).
And this is where tourist solar panels come to the rescue (often referred to as tourist solar panels, but it’s more correct to call batteries).
This solar cell of five solar cells was bought on Aliexpress from this seller, the price at the date of review is $ 22.3 (subject to change in the future). There is a similar battery on sale, but not with five, but with four solar cells. Its price is $ 20.4, but it makes no sense to buy it (significant loss in energy with insignificant savings in cost).
The manufacturer claims 10 watts for the battery. But is it so, and how much the manufacturer “was wrong” – we will figure it out during the review.
Before moving on to the review, let’s look at the closest competing solution: a power bank with a built-in solar panel.
Comparison of the usefulness of tourist solar panels and power banks with solar panels.
You can often find advertisements for powerbanks with built-in solar panels as travel devices for tourists.
They look something like this:
But, dear readers, their usefulness for charging from solar energy is extremely small.
The main, but not the only, reason for their poor suitability for converting solar energy is the small area of the solar cell. Elements of such an area can give from 0.5 to 1.5 W of power even in direct sunlight (depending on the area and other factors).
As a result, charging a typical power bank with a capacity of 10,000 mA * h (37 W * h) may take several days.
And if the weather is not very sunny, then the power bank will not charge at all for the entire trip.
The second reason is the loss of efficiency during the transfer of charge from the power bank to the smartphone.
First, the battery in the power bank must be charged from the solar battery, and then the energy from the battery of the power bank must be transferred to the smartphone battery.
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