Last year when we spent holidays in Greece we suffered from a hurricane. The result of this was 5 days with no water and no electricity. Fortunately I had taken a water filter so we didn't run short of drinking water as we filtered rain. Electricity though was another thing, we really struggled. So when I got home I bought a mobile solar charger.
I am no expert on solar anything so I asked around and finally bought the 10W panel. It was the same as the above photo but with smaller panels. Unfortunately it didn't work properly with my iPhone, I kept getting a message that this accessory was not compatible.
I contacted MSC, explained the problem and they sent me the 3 panel 15W panel at no extra cost. Now that I am more familiar with the panels I found the problem, which I will explain later.
The specification of the 3 panel charger is:-
(spec courtesy of MSC website)
This year on our holidays in Greece I used the charger almost every day for a month. Obviously in Greece the sun shines dependably, so if we had problems in Greece then the issue would be worse in UK.
Charging power banks with the solar panels is trouble free and certainly the best piece of kit to use to recharge your phone and other gear.
Charging phones directly, I have tried 2 brands, Apple and Samsung. If like in Greece the sun is constant then charging the iPhone is no problem but if the sky is sunny and cloudy then the output voltage from the charger to the phone will be variable. It seems that the iPhone has very tight parameters regarding charger voltage variance and this can make the phone reject the solar charger as incompatible.
The Samsung seems to accept the voltage variance better than the Apple.
Putting a power bank between the charger and accessory acts as a voltage regulator and that is why I say the best setup is to use a power bank in UK.
Now that I have used it regularly I am glad I bought it, however if there is a panel available with a built in voltage regulator, I would get that one.
Costs. 10W £80, 15W £109.