Best Solar Power Banks for Emergency Phone Charging (2026)
A solar power bank for emergency use serves as a last-resort phone charging solution when grid power is unavailable and larger battery systems are depleted. Understanding the realistic limitations of solar power banks is critical: the solar panels on portable power banks are small, and in real-world conditions they recharge slowly: a 20,000mAh bank might take 40–80 hours of full sun to fully recharge via its built-in solar panel alone. Their real value is as emergency devices that can trickle-charge from available sunlight over days, keeping a phone marginally alive for calls and GPS when nothing else is available. This guide covers the best options at each use case and capacity level.
Quick Picks
| Product | Capacity | Solar Input | Best For | Price |
|---|---|---|---|---|
| Anker 737 | 24,000mAh | None (AC/USB) | Maximum capacity; fast-charge; BOB and home kit | ~$70 |
| BLAVOR Solar 20,000mAh | 20,000mAh | ~1W solar panel | Best solar emergency bank with wireless charging | ~$40 |
| Hiluckey 25,000mAh Solar | 25,000mAh | ~2W solar panel | Best budget solar power bank | ~$35 |
| BigBlue 28W Solar Panel | N/A (panel only) | 28W USB output | Pair with any power bank for fast solar recharge | ~$55 |
What to Know About Solar Power Banks
The smarter approach for solar emergency charging:
- Maintain a high-capacity non-solar power bank (like the Anker 737) fully charged as primary emergency reserve
- Pair it with a dedicated foldable solar panel (like the BigBlue 28W) that charges via USB: this charges a power bank in 2–4 hours vs. the 50+ hours of a built-in panel
- Use a solar-integrated power bank as a backup-of-backup for extended scenarios where you have time to trickle-charge
Anker 737 Power Bank: Best Overall Emergency Power Bank
The Anker 737 is the highest-performing portable power bank in its price range: 24,000mAh capacity, 65W fast charging (charges laptops, not just phones), a built-in digital display showing remaining capacity, and Anker’s industry-leading reliability. It has no solar panel, but it charges via USB-C from any solar panel, portable power station, or wall outlet. For emergency preparedness, the strategy is to keep it fully charged at home, and pair it with a foldable solar panel in your BOB. One Anker 737 provides 5–6 full phone charges or 2–3 full tablet charges.
- 24,000mAh: 5–6 full phone charges; 2–3 tablet charges
- 65W USB-C output: also fast-charges laptops
- Digital capacity display; Anker quality assurance
- Charges via any USB-C solar panel or power station
BLAVOR Solar Power Bank 20,000mAh: Best Solar-Integrated Option
The BLAVOR is the best solar-integrated power bank if you specifically want the built-in panel option: it includes a 10W wireless charging pad (for Qi-compatible phones), USB-A and USB-C wired outputs, a built-in compass, LED flashlight, and a rugged rubberised case. The solar panel adds a trickle charge sufficient to maintain a partial charge if left in sunlight between uses: useful as a long-term emergency standby device. At $40, the wireless charging pad is a genuine differentiator that no other solar power bank in this price range offers.
- 20,000mAh; 10W wireless Qi charging pad
- USB-A + USB-C outputs; built-in LED flashlight
- Rugged rubberised case; built-in compass
- Solar trickle charge; best all-in-one solar power bank
Hiluckey 25,000mAh Solar Charger: Best Budget Solar
The Hiluckey 25,000mAh provides the most capacity of any solar power bank under $40. With four solar panels and dual USB-A outputs (5V/2.1A each), it recharges marginally faster from sunlight than single-panel designs and can simultaneously charge two devices. The build quality is functional without being premium, and Hiluckey’s solar products consistently receive strong reviews for reliability. For a budget-conscious emergency preparedness purchase, this is the right solar power bank.
- 25,000mAh: highest capacity budget solar bank
- Four solar panels; dual USB-A simultaneous charging
- Under $35: best value solar emergency power bank
BigBlue 28W Foldable Solar Panel: Best Dedicated Solar Charger
The BigBlue 28W foldable solar panel is the right tool for fast solar recharging of power banks and devices. At 28W USB output, it charges a 10,000mAh power bank in approximately 2–3 hours of full sun: compare this to the 50+ hours required to do the same via a built-in solar panel. It folds to book-size, hangs from a pack with the included carabiner hooks, and has both USB-A and USB-C outputs. This is the solar panel to pair with an Anker 737 or similar non-solar power bank for a high-performance solar charging setup.
- 28W USB output: charges 10,000mAh bank in 2–3 hours full sun
- Folds to book size; carabiner loops for pack attachment
- USB-A + USB-C outputs; works with any power bank
- Far faster than integrated solar panels on combo units
Solar Power Bank FAQ
How many phone charges does a 20,000mAh power bank provide?
Approximately 4–5 charges for a modern smartphone (iPhone or Android with a 4,000–5,000mAh battery). The 20,000mAh rating is the bank’s internal battery capacity; real-world output is approximately 70–75% of rated capacity due to voltage conversion losses. A 20,000mAh bank with 75% efficiency = about 15,000mAh of usable energy. A phone with a 4,000mAh battery charged from 0–100% = 3.75 charges. For context: a family of four with phones each at 3,000–4,000mAh gets approximately 3–4 full charges each from a single 20,000mAh bank.
Should I get a solar power bank or a regular power bank for emergencies?
For most preparedness scenarios (1–5 day outage): a high-capacity non-solar power bank (Anker 737 at 24,000mAh) stored fully charged is more practical: it provides more usable energy and charges faster. For extended scenarios or remote situations: a foldable solar panel (BigBlue 28W) paired with any USB-compatible power bank recharges faster than any built-in solar panel. Solar-integrated power banks are a convenience feature, not a performance feature. If you only buy one, buy the Anker 737 and keep it charged.