Quote:
Originally Posted by haertig
Smart phones take quite a bit of power to charge. They have pretty significant batteries in them. Don't equate small size with small charging needs. And a battery pack capable of charging a smart phone in a reasonable time is not going to have a small battery itself. This all can be done, for sure, but not with small solar panels. Be sure and do good research on what will be required to charge the specific devices you are targeting, within the time constraints of how fast you want to charge them. I would take whatever specs the solar panel quotes and reduce those to 1/4 to maybe get a more realistic picture of what you could actually expect out of them in real world conditions.
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Interesting. I have one that is very similar to this
https://www.amazon.com/20000mAh-Wate...dp/B09NLL41KY/ and it takes about 3 hours to charge if I leave it on a windowsill on the western side of the house (although the battery wasn't totally dead when I started charging). It will charge my phone overnight, with some charge left over in the morning to give a little boost to my Kindle. I then put it back on the windowsill to charge again. I just did this a month or so ago when we had a multi-day power outage. I live in the Northeastern United States.
Shari