GOLUMU GU-SP 30W Foldable Solar Panel Charger

Panel: The GOLUMU GU-SP is a 30W foldable solar charger with USB-A and USB-C outputs for charging devices directly in sunlight. It has no energy storage, so it cannot serve as a power bank when sunlight is unavailable.

At a glance

Three folding panels and hanging holes are intended for positioning outdoors or attaching to a backpack.
Two USB-A ports and one USB-C port are listed, with the seller recommending single-port use for peak efficiency.
The panel supplies power directly from sunlight and has no built-in energy storage.
The listing recommends direct, unobstructed sunlight and says partial shade reduces charging performance.

Price

$25.19Save 30%

Reference price: ~~$35.99~~

Price checked: Nov 13, 2026

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Pros and cons

Pros

USB-A and USB-C outputs offer several ways to connect phones, tablets and power banks.
Folded dimensions and listed weight support carrying it in a backpack.
MPPT tracking and device-detection charging are claimed by the listing.

Cons

Without energy storage, it cannot keep charging a device after sunlight stops or store energy for later.
Charging depends on sunlight, and the listing warns that shadows or partial shading reduce performance.

Technical specifications

19 specifications

Identity
Brand	GOLUMU
Model	GU-SP
Maximum power	30 watts

Dimensions and installation
Folded dimensions listed	13.6"L x 7.5"W x 1"H
Unfolded dimensions	27.1 x 13.7 x 0.1 inch
Panel design	3 folding panel design
Hanging features	2 hanging hole feature
Listed weight	30 ounces (850g)

Outputs and charging
USB-A output	USB-A (Max15W)
QC3.0 USB-A output	QC3.0 USB-A (Max24W)
USB-C output	PD3.0 USB-C ports (Max20W)
Maximum voltage	12 volts

Materials and protection
Material listed	Fabric
Solar cell and surface claims	monocrystalline cell and ETFE film
Listed protection rating	ip67 dustproof waterproof
Light transmission claim	up to 90%
Energy conversion claim	up to 24%

Charging technology
Tracking efficiency claim	up to 99%
Peak conversion efficiency claim	98%

What to know before buying

For best stated performance, orient the panel vertically toward direct sunlight and avoid obstructions. The listing advises shading the connected device in hot sun because overheating protection may stop charging.

Listing details to confirm

The listing has inconsistent panel claims: the title and several details identify a 30W charger, while feature text refers to a 45W panel. Output information also conflicts, with 12 volts listed as maximum voltage but an 18-volt output field that appears malformed. The material is listed as Fabric while the feature text describes ETFE film. Confirm the selected model's exact rating and construction. The seller also says the junction box is not completely waterproof and should be kept indoors during heavy rain, despite the IP67 claim.

What’s in the box

Solar panelIncluded
2 CarabinersCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

Campers, hikers and backpackers who want a foldable panel for charging devices directly in clear sunlight.
Buyers who can reposition a panel to follow direct sun and do not need stored power.

Less suited to

People who need reliable charging at night, in shade or when the panel is packed away.
Buyers seeking a solar panel whose listed output rating and construction are unambiguous without checking the selected listing.

GOLUMU GU-SP 30W Foldable Solar Panel Charger · photo 2 — Additional product photo 2

Frequently asked questions

Does the GOLUMU GU-SP store power for later?

No. The listing states that it converts solar energy directly and has no energy storage function.

Can it charge multiple devices at once?

The feature text describes simultaneous charging through its USB ports, but recommends single-port use for peak efficiency. Actual charging depends on sunlight and connected devices.

What should I know about its water protection?

The listing claims IP67 protection but also says the junction box is not completely waterproof and should be kept indoors during heavy rain.

Is the panel's wattage consistent across the listing?

No. The title and details call it 30W, while feature text refers to a 45W panel. Confirm the rating for the selected listing.