The peak watt figure is a bench value, not a field promise · review
QUXV 20 W folding USB panel, two ports, IP44, 0.91 kg stated review
A 20 W folding USB panel carrying the highest conversion percentage published in this hub, 25.4 %, printed with no irradiance, no cell temperature and no dimension of any kind beside it.
The bottom line The highest efficiency percentage on this shelf, printed without one of the conditions that would give it a meaning.
What this listing puts on record
A 20 W folding panel with two output sockets, USB-C and USB-A, a stated conversion efficiency of 25.4 %, an IP44 rating, eyelets and two carabiners, and a stated weight of 0.91 kg.
The efficiency figure, and what sits behind it
25.4 % is the highest conversion percentage published in this hub. It arrives on its own: no irradiance in watts per square metre, no cell temperature, no air mass. Those three are what standard test conditions consist of, and without them a percentage ranks panels against one another and does nothing else. The listing also names no cell type, so there is not even a monocrystalline or polycrystalline label to hang the number on.
Two ports, two current limits
USB-A at up to 5 V/2.4 A, USB-C at up to 5 V/3 A, and 5 V/4 A across both together. Those are useful numbers, and every one of them is at 5 V. Nothing here mentions a Power Delivery profile, so a laptop or a phone that expects to negotiate 9 V or 12 V has nothing on this page to read.
Nothing about size folded or open
The panel is compared to an iPad. That is the whole of what the listing says about its dimensions, folded or unfolded, and none of it can be checked against a lid pocket or a pannier before ordering. The 0.91 kg is published; the space it occupies is not.
What a bare panel needs next
The listing says plainly that the panel stores no power and that the device is connected directly to it. Nothing here names a charge controller — and no listing on this shelf does. If the plan is to feed a battery rather than a phone, the regulation has to come from the battery end.
Availability
Selling between 19 € and 21 € across the German, French, Italian and Spanish Amazon stores when this page was checked.
It also sells on the British Amazon store in the local currency, which the range above does not cover — that range counts euro stores and nothing else.
Catalogued on the American Amazon store with nobody selling it: the reference is there, the offer is not.
Every figure in this section is what Keepa returned on the day this page was last updated. Prices and offers change without notice.
Prices quoted in this text were read on 6 September 2026. The live price is at the top of the page.
What it does well, and where it gives way
Strengths
25.4 % is the highest conversion percentage published in this hub, and it arrives as a plain number rather than a range
Both ports are quoted with their own current limit and with a combined limit for using them at once
States outright that the panel stores nothing: the device is plugged straight into it
Compromises
No folded and no unfolded dimensions anywhere; the size of an iPad is the only comparison offered
No cell type, so the 25.4 % cannot be set against the monocrystalline panels on this shelf
Every output figure is at 5 V, so a device that negotiates a Power Delivery profile gets no answer here
Specifications
Stated peak output
20 W — stated in the title and repeated in the first bullet point
Test conditions stated
Not published on the listing — no irradiance, no cell temperature and no air mass accompany the 20 W figure
Cell type
Not published on the listing — neither monocrystalline nor polycrystalline is named
Stated efficiency
25.4 % conversion efficiency — stated
Port set
Two ports, USB-C and USB-A — stated; USB-A at up to 5 V/2.4 A, USB-C at up to 5 V/3 A, and 5 V/4 A across the two together
Power Delivery profiles
Not published on the listing — every figure quoted is at 5 V, and no Power Delivery profile is named
Controller included
Not published on the listing — an intelligent chip is described as guarding against overcurrent, overvoltage and short circuit, and no charge controller or regulator is named
Folded dimensions
Not published on the listing — the panel is compared to the size of an iPad, which is not a dimension
Unfolded dimensions
Not published on the listing
Weight
0.91 kg — stated, given as roughly 2 lb in the same bullet point
IP rating
IP44 — stated; the maker also asks that the panel be kept clear of water while charging
Amazon reference
B0G8ZWQ4HZ (same reference on 6 Amazon marketplaces)
EAN
0632216519443
What people ask before buying
What does the 25.4 % actually describe?
A conversion efficiency, published as a bare percentage. The listing gives no irradiance, no cell temperature and no air mass, which are the conditions a laboratory figure is established against. Read it as a way of ranking this panel beside others quoting the same kind of number, not as a yield to plan a day around.
Will it charge a power bank while a phone is plugged in?
The maker states 5 V/4 A across the two ports together, against 5 V/3 A on the USB-C alone. Those are the figures to work from. What the listing does not settle is what either port does when the sun goes behind a cloud, beyond describing an auto-restart feature that picks the charge back up on its own.
SOLIX PS30 folding solar panel · 30 W stated · USB-A and USB-C · IP65 · two carabiners and an 18-month warranty · no size, mass or efficiency published
The emptiest specification of the nine: a 30 W folding panel with USB-A, USB-C and an IP65 rating, and no mass, no size, no cell type and no efficiency figure anywhere on the page.
Best for: A buyer choosing on the brand and the IP65, who does not need the panel compared with anything.
40 W folding solar module · XT60, USB-A and USB-C · 23 % efficiency stated · IPX4 · fold-out feet and a carry handle · XT60 and USB-C leads supplied · no size or mass published
A 40 W module sold first as an accessory to the maker's own battery power station, with an XT60 lead in the box, fold-out feet to aim it at the sun, and no dimension or mass published anywhere.
Best for: An owner of the maker's own battery power station, for whom the XT60 lead in the box settles the question.
15 W folding solar panel · three rubber-covered connectors · up to 24 % conversion stated · IP67 · 19.8 × 22.4 × 1.8 cm folded · 0.45 kg — the lightest published weight of the nine
The lightest and smallest panel of the nine at 0.45 kg and 19.8 × 22.4 × 1.8 cm folded, and also the lowest peak figure here at 15 W — the trade is written on the label.
Best for: A day pack where the panel has to disappear between uses and a phone is the only thing being charged.
