Thread: SOLAR CHARGING VS BATTERY BANK

The small solar panels on power banks are not worth the effort of carrying. There have been a number of tests done and they typically need about 60 long days of sun to produce enough charge for a single 18650. To be of any use you would need at least 10W which is too big for anything you would typically carry in unless it was a one way trip to set up a hut.

Best to carry charged rechargeable batteries. I don't buy a phone unless I can change batteries in the field.