What you are wanting will not work! Those little single solar panels connected to a charger does not have enough solar capability to put much of a charge into a phone, in fact from what I've read you would need 4 days of bright sunlight for those to fully charge a phone. The idea is that you fully charge the charger which is a powerbank, and you charge your phone up with the powerbank, and then charge the powerbank with the connected solar thing, but even after charging the phone you might have 2/3rds or so power left in the battery bank, and that could take a couple of days to charge, so you would be basically always getting yourself into a negative situation till eventually you can't charge the battery or the phone, and that would take 2 to 4 days depending on the size of the solar panel.
But if you get a Anker 3 panel solar 21 watt charger, this thing will charge up your phone as fast as charging up your phone by plugging it in...on a sunny day of course. The more panels you have the better the thing operates in less than sunny days but you pay the price of weight and bulk. I have 3 panel unit and it is a bit heavy but it doesn't take up much space, but that weight also includes a Anker slim 10,000 powerbank I bought separately so I could charge up my phone on dark days. WORD of CAUTION concerning these solar panels and powerbanks, you have to make sure you order one that is compatible with your phone type, android or IPhone, otherwise it won't work and you'll be pissed. The Anker solar and powerbank combined with taxes and shipping will set you back under $100, and since it is a 3 panel system it will charge faster than a 2 panel system like the Goal Zero Nomad 7 system. These panels can also be laid open on top of your rear rack, using bungie cords and the eyelets to hold it down you can be charging while riding. These are generally waterproof as well so even if it rains on your panels you'll be alright. The Nomad 7 system is no longer made and Goal Zero raised their prices a lot, thus the newer Nomad 10 dual panel unit is $100 instead of just $59 it once was, and their 3 panel unit is $150, so you can see that the Anker is the better deal. Anker too raised their prices because I got mine for $39, they're now $59, and powerbank prices went up because mine was only $13 now it's $39?! after just one year??
