On this page
This guide covers 20000mah vs 30000mah solar power bank. A 20000mAh solar power bank holds less charge than a 30000mAh bank, so it charges a phone fewer times before it needs a recharge. No 30000mAh bank is in this group: the ERRBBIC bank here states 20000mAh, the YELOMIN banks state 38800mAh and 10000mAh, and the TRASHBINEAN bank states 49800mAh. Pick the 20000mAh ERRBBIC if you want the stated 20000mAh figure with 15W fast charging and wireless charging, or pick a larger bank if you want more charges per trip.
SolarKitHQ earns a commission when you buy through links on this page, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure.
The quick answer
Capacity in mAh is the size of the bank’s battery. The banks here state 10000mAh, 20000mAh, 38800mAh and 49800mAh. A bank with more mAh charges a phone more times before it runs out, and the TRASHBINEAN bank states it can fully charge an iPhone 17 up to 8 times, a Galaxy 5 times and an iPad 3 times. Solar charging on these banks is a backup only: the YELOMIN banks say the panel slowly adds small amounts of power in direct sun, and a full solar recharge may require dozens of hours of effective sunlight. Charge by USB-C before trips, and treat the panel as a top-up.
Step 1: Match capacity to your trip
Start from how many charges you need before the next outlet. The 10000mAh bank suits a day trip with a phone and a few small devices, the 20000mAh bank suits a weekend with a phone, a tablet and earbuds, and the 38800mAh and 49800mAh banks suit longer trips with more devices. The table below lists the 4 banks in this group from the highest score to the lowest, with the figures each listing states.
| Bank | Capacity | Fast charging | Cables and ports | Warranty |
|---|---|---|---|---|
| ERRBBIC 20000mAh | 20000mAh | 15W, 60% in 30 minutes | 3 cables, wireless | 12-month |
| TRASHBINEAN 49800mAh | 49800mAh | 15W wireless, 0 to 50% in 30 minutes | 4 cables | 1 Year |
| YELOMIN 10000mAh | 10000mAh | 22.5W USB-A, 20W USB-C | 4 cables | 12-month |
| YELOMIN 38800mAh | 38800mAh | Not stated | 2 USB-A, USB-C | 12-month |
Step 2: Check the charging speed stated
The YELOMIN 10000mAh bank states up to 22.5W from each of 2 USB-A ports and 20W from USB-C, the highest charging watts stated here. The ERRBBIC bank states 15W fast charging with 60% in 30 minutes, and the TRASHBINEAN bank states 15W wireless charging and 0 to 50% in 30 minutes with USB-C PD. The YELOMIN 38800mAh bank states no charging watts. Speed varies by device, cable and connections, per the YELOMIN listing.
Step 3: Check the solar panel and the lights
All 4 banks have a solar panel and dual LED flashlights. The YELOMIN banks state Steady, SOS and Strobe modes, the ERRBBIC states Steady, Strobe and SOS, and the TRASHBINEAN states SOS mode. The panels add power slowly: the YELOMIN 38800mAh listing says a full solar recharge may require dozens of hours of effective sunlight, and the YELOMIN 10000mAh listing says the panel slowly adds supplemental power. Charge by USB-C before trips, and use the panel for top-ups in emergencies.
20000mAh vs 30000mAh solar power bank: the gear
The ERRBBIC bank states 20000mAh with a solid-state battery, 15W fast charging, wireless charging, 3 built-in cables and charging for up to 6 devices at once. It measures 6.4 by 3.3 by 0.7 inches, states 60% in 30 minutes, dual LED flashlights with Steady, Strobe and SOS modes, and UN38.3 and UL2056 certifications, with a 12-month warranty. The maker describes the solid-state battery as safer and more stable than traditional lithium batteries.
The TRASHBINEAN bank states 49800mAh, the largest capacity here, with 4 integrated cables, 2 USB ports and 15W wireless charging for up to 6 devices at once. It states 0 to 50% in 30 minutes with USB-C PD, up to 8 full charges for an iPhone 17, 5 for a Galaxy and 3 for an iPad, dual LED flashlights with SOS mode, and a 1 year warranty. The maker states over a decade of work in solar power banks.
The YELOMIN 10000mAh bank states 4 built-in cables, 3 outputs, up to 22.5W from each of 2 USB-A ports and 20W from USB-C. It measures 5.9 by 2.95 by 0.98 inches, weighs about 8 oz, has dual LED flashlights with Steady, SOS and Strobe modes, and states a 12-month warranty.
The YELOMIN 38800mAh bank states 2 USB-A outputs and a USB-C input/output port, dual LED flashlights with Steady, SOS and Strobe modes, and a carabiner for clipping to a backpack. It weighs 9.9 oz, measures 5.9 by 2.95 by 0.98 inches, has port covers for dust and splashes, and states a 12-month warranty.
Which capacity should you choose?
Choose the 20000mAh ERRBBIC if you want the stated 20000mAh figure with wireless charging, 3 built-in cables and stated certifications. Choose the 49800mAh TRASHBINEAN if you want the most charges per trip, with up to 8 iPhone 17 charges stated. Choose the 10000mAh YELOMIN if you want the highest stated charging watts at 22.5W in a bank of about 8 oz. Choose the 38800mAh YELOMIN if you want a larger bank with a carabiner and port covers for outdoor use.
FAQ: power away from the grid
Is there a 30000mAh bank in this group?
No. The banks here state 10000mAh, 20000mAh, 38800mAh and 49800mAh. The 20000mAh ERRBBIC is the only bank at the 20000mAh figure.
Can the solar panel fully recharge these banks?
The listings say no, not in practical use. The YELOMIN 38800mAh listing says a full solar recharge may require dozens of hours of effective sunlight, and the panels are a supplemental backup. Charge by USB-C before trips.
Which bank here states the highest charging watts?
The YELOMIN 10000mAh bank, with up to 22.5W stated from each of 2 USB-A ports and 20W from USB-C. The ERRBBIC and TRASHBINEAN banks state 15W.
Which banks here have wireless charging?
The TRASHBINEAN 49800mAh bank with 15W wireless charging, and the ERRBBIC 20000mAh bank with wireless charging stated. The YELOMIN banks state no wireless charging.
Related solar guides
See every Solar Chargers and Power Banks guide and all Power Stations and Generators guides. Also see our solar charger vs power bank for hiking and best solar power bank for overlanding.
More picks: best portable power station for camping, best solar power bank for digital nomads, solar charger calculator.
