What the FlexSolar 20W Portable Solar Panel Offers Off-Grid
SuLu Outdoors tests the FlexSolar S20 Solar Pad, a dual-panel portable solar charger designed for RV and van dwellers who need emergency power when the truck isn't running. This compact unit features two foldable solar panels, a USB and USB-C port, and comes with carabiner clips for easy attachment to backpacks or gear. The video captures a real-world charging scenario in bright sunlight, measuring actual battery gains over time rather than marketing promises.
This product suits van lifers and off-grid campers who want a lightweight, affordable backup for phones and small devices during stationary stays. It won't power tablets, cameras, or laptops—that would require a larger (and bulkier) panel—but for topping up your phone during a multi-day site setup or keeping juice flowing while hiking, it's worth considering at around $35 CAD.
Key Moments
Key Moments and Performance Data from the Review
- Instant charging confirmation when plugged in via USB
- Real-time battery tracking: 52% to 66% over just over one hour in strong sun
- Panel surfaces heat up noticeably during use, indicating active power generation
- Included carabiner clips allow hands-free mounting on backpacks or camp setups
- Requirement to follow the sun throughout the day for optimal charging speed
- No internal battery—energy is live only during daylight, unusable after sunset
What to Know Before Choosing This Solar Panel
- Charging speed: Roughly 14% battery gain per hour in full sun (measured on a Samsung S20 from 52% to 66% in 65 minutes)
- Direct sunlight required: Manufacturer specifies placement in full sun with no barriers like windows or shade
- No included charging cable: Bring your own USB or USB-C cord; cheap cables may reduce efficiency
- Active monitoring needed: Must reposition the panel regularly as the sun moves to maintain charge rate
- No battery storage: Does not store energy; power stops at sunset unless paired with an external power bank
- Weight and portability: Compact enough for van storage, but larger models (for faster charging) become bulky for backpacking trips
- Best use case: Stationary off-grid camping sites where you can leave it deployed for hours
Frequently Asked Questions About the FlexSolar 20W Panel
How much does the FlexSolar 20W cost?
The video mentions the panel costs around $35 CAD (approximately $26 USD), making it an affordable entry point for portable solar charging.
Can this panel charge laptops or cameras?
No. The 20W output is designed for phones and power banks only. The reviewer notes that larger panels would be needed for bigger devices, but they become significantly bulkier and less practical for van storage.
How long does a full phone charge take?
The video does not complete a full charge test, but demonstrates roughly 14% gain in one hour under ideal conditions. A complete charge would likely take 6–8 hours depending on sun angle, panel angle, and cable quality.
Do I need a power bank with this panel?
Not required, but highly recommended. Since the panel generates power only during daylight and cannot store energy, pairing it with a power bank lets you charge during the day and use stored power after sunset—essential for multi-day off-grid trips.
Is this good for backpacking or hiking?
The carabiner clips make it mountable to a pack, and it can trickle-charge your phone while you walk. However, the reviewer wishes it were smaller for true backpacking comfort; current size and weight work best for vehicle-based camps rather than backcountry trips.
