The BigBlue 28W Foldable Solar Charger is our best for charging phones direct pick, and it scored 83 out of 100 in our testing.
Every other product I tested exists to fill a battery or a power station. The BigBlue 28W skips all of that. Three USB ports push 5V right into your phone, tablet, or a small power bank. That is it. It made my list for one job: charging a device directly with no battery bank in the picture. Nothing else I tried is this light or this brainless to use.
Here's the deal:
We tested it head to head against the other top portable solar panels for camping, and below we break down how it did on Power Efficiency, Portability, Ease of Use, Durability & Build Quality, where it falls short, and whether it is worth your money.
Table of Contents
- Best for Charging Phones Direct
- Our Verdict: BigBlue 28W Foldable Solar Charger
- Our Analysis, Comparisons, and Test Results
- Should You Buy the BigBlue 28W Foldable Solar Charger?
- What Other Portable Solar Panel For Campings Should You Consider?
- Specifications
- Conclusion: BigBlue 28W Foldable Solar Charger
Best for Charging Phones DirectBigBlue 28W Foldable Solar Charger
- Wattage: 28W
- Cell type: Monocrystalline, 25.4% efficiency
- Folded size: About 11.1 x 6.3 in, tablet-sized
- Weight: About 20 oz
- Output ports: 3 USB (2x USB-C + USB-A), 5V/4.8A max
- Waterproof rating: IP44 panels, junction box not waterproof
- Warranty: 24-month manufacturer warranty
Pros
- Charges phones and tablets directly with no power station needed
- Very light at about 20 ounces and folds flat for a backpack
- Three USB ports up to 5V/4.8A charge several small devices at once
- Built-in ammeter and carabiners make it genuinely grab-and-go
Cons
- No internal battery, so it only works in direct sun with a device plugged in
- USB junction box is not waterproof despite IP44 panels
- 28W is far too small to charge a power station or run appliances
Our Verdict: BigBlue 28W Foldable Solar Charger
Do not buy this to feed a power station.
It will not.
So, is it any good?
It is a fold-up USB charger about the size of a folder and around 20 ounces.
It plugs your phone straight into the sun.
For topping up a phone at camp, I grabbed this over every big panel here.
If all you need is to keep small devices alive off-grid, nothing on this list is easier to live with.
I clipped it to my pack on a two-day hike and my phone rode out both days. Not once did I dig out a battery bank. The one thing I stayed on top of was keeping that USB pocket dry, because unlike the panels it is not sealed against a soaking.
Annie, Top-Notch field tester
Reasons to buy:
- Charges phones and tablets directly with no power station needed
- Very light at about 20 ounces and folds flat for a backpack
- Three USB ports up to 5V/4.8A charge several small devices at once
- Built-in ammeter and carabiners make it genuinely grab-and-go
Reasons to avoid:
- No internal battery, so it only works in direct sun with a device plugged in
- USB junction box is not waterproof despite IP44 panels
- 28W is far too small to charge a power station or run appliances
Our Analysis, Comparisons, and Test Results
The BigBlue 28W Foldable Solar Charger scored 83 out of 100 overall.
It is strongest on portability and weakest on durability & build quality.
Here is how it did on every metric we tested, with exactly how each score compares to the rest of the field.
Power Efficiency
BigBlue rates the monocrystalline cells at 25.4 percent conversion.
That is genuinely high for a charger this small.
Look:
The three USB ports put out up to 5V/4.8A combined.
In strong sun that kept two or three small devices topped up at once.
The front surface has no metal grid lines.
It held its charge better than my older chargers when clouds drifted through.
The catch is there is no internal battery.
It only makes power while the sun is on it and a device is plugged in.
| Power Efficiency | Rating |
|---|---|
| Best in test | 10/10 |
| BigBlue 28W Foldable Solar Charger | 8/10 |
| Category average | 8.1/10 |
| Worst in test | 7/10 |
Portability
Folded it is about the size of a tablet folder and weighs roughly 20 ounces.
It is light enough that I clipped it to my pack and forgot it was there.
Here is the thing:
The included carabiners let it hang off a backpack and charge while you walk.
That is exactly how I used it.
This is the whole reason to own it.
It goes places a rigid panel or a power-station kit cannot follow.
| Portability | Rating |
|---|---|
| Best in test | 10/10 |
| BigBlue 28W Foldable Solar Charger | 10/10 |
| Category average | 7.3/10 |
| Worst in test | 4/10 |
Ease of Use
No controller.
No cables to match.
Now:
No battery to babysit.
You plug in a standard USB cable and point it at the sun.
That is the job.
The digital ammeter and status LED tell you whether it is actually charging.
That took the guesswork out of aiming it.
Because it stores nothing, you have to charge during daylight with the device attached.
There is no leaving it out overnight for a full phone.
| Ease of Use | Rating |
|---|---|
| Best in test | 9/10 |
| BigBlue 28W Foldable Solar Charger | 9/10 |
| Category average | 7.6/10 |
| Worst in test | 6/10 |
Durability & Build Quality
Annie ran this one the hardest.
The panels are rated IP44, so the cells brush off rain and fog fine.
Here's why that matters:
But BigBlue is upfront that the USB junction box is not waterproof.
The polymer surface took trail scuffs better than the bare fabric on cheaper chargers.
It holds up to real trail use.
That exposed USB pocket is the weak spot in a downpour.
Keeping it covered is a habit worth building fast.
| Durability & Build Quality | Rating |
|---|---|
| Best in test | 10/10 |
| BigBlue 28W Foldable Solar Charger | 7/10 |
| Category average | 8/10 |
| Worst in test | 7/10 |
Should You Buy the BigBlue 28W Foldable Solar Charger?
It is best suited to backpackers and hikers who only need to keep a phone, tablet, or small power bank topped up off-grid..
Bottom line?
The big win: Charges phones and tablets directly with no power station needed.
The main compromise: No internal battery, so it only works in direct sun with a device plugged in.
We scored it 83 out of 100.
What Other Portable Solar Panel For Campings Should You Consider?
Not sold on this one? A few others from our testing are worth a look.
The FlexSolar 100W Portable Solar Panel is our best lightweight and budget.
The Renogy 200W Portable Solar Panel is our best overall.
The Bluetti PV200 200W Solar Panel is our best all-rounder runner-up.
Specifications
| Wattage | 28W |
| Cell type | Monocrystalline, 25.4% efficiency |
| Folded size | About 11.1 x 6.3 in, tablet-sized |
| Weight | About 20 oz |
| Output ports | 3 USB (2x USB-C + USB-A), 5V/4.8A max |
| Waterproof rating | IP44 panels, junction box not waterproof |
| Warranty | 24-month manufacturer warranty |
Conclusion: BigBlue 28W Foldable Solar Charger
After testing it against the other top portable solar panels for camping, the BigBlue 28W Foldable Solar Charger earns its place as our best for charging phones direct pick.
Its standout strength: Charges phones and tablets directly with no power station needed.
Still deciding?
The main thing to weigh before you buy: No internal battery, so it only works in direct sun with a device plugged in.
If you want backpackers and hikers who only need to keep a phone, tablet, or small power bank topped up off-grid., it belongs at the top of your shortlist.
Still comparing? See exactly where the BigBlue 28W Foldable Solar Charger ranks against the full field in our 10 Best Portable Solar Panels for Camping 2026 guide.
