Portable chargers are the better default for most backpackers because they deliver stored power on demand, while solar chargers only work well on long, sunny trips.
Choosing between a solar charger and a portable charger for backpacking comes down to one honest question: can you count on direct sun when you need power? A portable charger answers yes every time. A solar panel answers yes only on long, sunny trips where you can keep it angled at the sky.
Why a Portable Charger Wins For Most Trips
Portable chargers store energy before you leave, so weather, tree cover, and time of day never matter. You charge your phone or GPS at night, in a tent, or under a thunderstorm. REI’s backpacking-oriented review of battery packs highlights this exact advantage: storing energy for later use beats depending on sunlight in the moment.
The trade-off is weight and capacity planning. A 10,000 mAh power bank adds roughly half a pound to your pack, and once it’s drained, it’s done. For weekend trips and most week-long hikes, that predictable energy is worth the weight.
If you’re deciding between specific models, our tested comparison of the best charger for backpacking breaks down real-world runtimes and weights side by side.
When a Solar Charger Makes Sense
Solar chargers earn their place on trips longer than several days in consistently sunny, open terrain. The BioLite SolarPanel 5+ 2.0, $99.95 at REI, pairs a 5 W panel with a 3200 mAh onboard battery, meaning it can charge a device in real time OR store energy for later. BioLite’s design uses an Optimal Sun System with a 360° kickstand and integrated sundial so you can aim the panel accurately.
The Goal Zero Nomad 10 offers a bigger 10 W panel for $79.95, with a 180° adjustable kickstand and built-in USB-A output. Expect to pay for that wattage in weight: 1.12 pounds.
Both panels charge a phone or GPS unit when placed in direct sunlight at the right angle. Neither works well in motion, under tree cover, or on cloudy days. Solar output is not constant, so treat these as a way to top off during breaks, not as a guaranteed power source.
| Option | Best For | The Catch |
|---|---|---|
| Portable Charger | Most backpackers; weekends and cloudy trips | Heavier than a panel for the same capacity; needs wall charging before you leave |
| Solar Charger | Long, sunny, open-terrain trips | Output depends on sun angle and exposure; slow in real-world conditions |
| Solar + Power Bank Hybrid | Multi-week trips with daily sun exposure | Heaviest option; only useful if you actually stop to angle the panel |
How To Use A Solar Panel Correctly On The Trail
Place the panel in direct sunlight, not on a pack bouncing down the trail. Use the kickstand to face the sun, and re-angle it as the sun moves. Voltaic Systems, which builds backpacking-specific solar gear, emphasizes proper alignment as the difference between useful output and wasted weight.
For the BioLite panel specifically, devices charge from the integrated 3200 mAh battery or directly while the sun shines. The panel collects during the day and discharges at night, which is the practical pattern for trail use.
One honest limit: IPX4 splash resistance on the BioLite means light rain is fine, but neither panel survives a dunk in a creek. Keep both dry inside your pack liner when not in use.
Pick The Right Tool For Your Trip
For 1–5 day trips in variable weather, take a portable charger and skip the panel. For 6+ days in guaranteed sun with daily charging breaks, a solar panel like the BioLite SolarPanel 5+ 2.0 earns its 13.8 ounces. For expeditions of two weeks or more, pair a small panel with a power bank so you can store daylight for the nights that need it.
FAQs
Can I charge my phone from a solar panel while hiking?
Not effectively. Panels need direct sunlight and proper angling to produce useful output, and a panel swinging on your pack rarely stays aligned. Stop for a break, lay the panel flat facing the sun, and let it charge for 30–60 minutes for a meaningful top-up.
How long does a solar charger take to charge a phone?
That battery then holds roughly one full phone charge. Real-world timing varies widely with cloud cover and angle.
Is a solar panel worth the weight for a weekend trip?
Usually not. A 10,000 mAh power bank weighs about the same as a small panel but delivers guaranteed power regardless of weather. Save the panel for trips long enough that stored energy runs out before you reach a wall outlet.
References & Sources
- REI. “BioLite SolarPanel 5+ 2.0 With Onboard Battery.” Product specs: 5 W panel, 3200 mAh battery, IPX4, 13.8 oz.
- Wirecutter (NYT). “The Best Portable Solar Battery Pack.” Comparative testing of solar panels and battery packs for outdoor use.
- Voltaic Systems. “Backpacking Solar Chargers.” Guidance on panel placement and angling for trail use.