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Whether you are using your portable solar charger or solar phone case as backup during a short trip, relying on it heavily while on a more extended trek, or just making sure you avoid fighting over sockets access at a festival, you might be need to know just how powerful the sun might be where you are going, and how to get the most from it.
It will not be a big surprise to see (in the maps below) that on average there is much more intense sunlight for solar charging the nearer to equator you are. This is partly because the light arriving from the sun is being spread out over a larger area the nearer to the North or South Pole you go (as the sun is not directly overhead), especially during the winter months. Of course, people using solar panels often try to face them directly towards the sun, to capture more energy.
One obvious point here is that the sun power for charging can be 10 times stronger in summer than in winter.
Also the comparison of Sheffield vs Nice is a reminder, if one were needed, that the UK is less sunny than the South of France.
The other message of this chart is to face your charger towards the sun: you can see the large difference it can make tilting towards the sun wherever you are, and especially in the colder seasons.


The mathematically minded will have noted that the % improvement by facing the sun is generally larger for the UK than France. Another shock headline, but this next chart compares example holiday destinations around Europe for beach holidays or trekking etc.
Also, those light rays will travel further through the atmosphere, so may have been scattered by the atmosphere and the various particles there.
Doing this captures both Direct Normal Irradiation (DNI) and irradiation reflected from the both the ground and to some extent from the atmosphere itself. However, I don’t imagine too many people are using a charger in the winter in Northern Europe, except for emergency charging on the ski slopes?
For simplicity I’ve compared a flat sheet on the ground to a panel tilted directly at the sun.
Differences in solar power will translate into reduced times to charge up in the sunnier locations.


This reflected energy depends very much on where you are, so for simplicity here is a map of the DNI alone. Most of us are more interested in how different locations compare during the spring and summer months, and this may be a bit different to the year overall.
More importantly, we can see that the available charging power is very much better by April.



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