22 October 2026
What a solar panel can really charge
Solar charging on a phone sounds bigger than it is, so let's be upfront about it: the solar panel on the back of Vortex is not going to charge a 6,000+ mAh battery from empty to full in any reasonable time. A panel small enough to fit on a phone's back, in real (not laboratory) sunlight, produces a small trickle of power — enough to matter in an emergency, not enough to replace a wall charger.
What it's actually for: you're out of charge, there's no socket around, and you need enough battery to send a message, make a call, or check a map. A rear solar panel left in direct sun can realistically claw back a meaningful amount of charge over an hour or more — not a full charge, but potentially the difference between a dead phone and a usable one.
We'd rather you know that going in than discover it the first time you expect a full charge from an afternoon in the sun. It's also why the interactive demo caps the simulated solar charge at a partial top-up, and why the FAQ answers this directly.