
1/5BigBlue 28W Portable Solar Charger with Digital Ammeter
The BigBlue 28W takes our top spot because it consistently outperforms competitors in real-world charging speed, producing nearly 950 milliamp-hours of energy per hour in our direct-sunlight benchmarks. The built-in digital ammeter is a genuinely useful feature that lets you reposition the panel for maximum output in real time, eliminating the guesswork that plagues most solar chargers. With three USB ports including USB-C, IPX4 waterproofing, and 25.4% cell efficiency, it strikes the ideal balance between power output, portability, and price.
Pros
- Built-in digital ammeter shows real-time charging output
- 25.4% high-efficiency cells outperform most competitors
- Three USB ports including USB-C charge multiple devices simultaneously
- IPX4 waterproof and durable for rugged outdoor use
Cons
- No built-in battery so charging stops when sun goes down
- Heavier than 21W panels at just over 1.3 lbs
- USB-C port limited to 5V output, no PD fast charging
- Bulkier when folded than ultralight competitors







