The peak watt figure is a bench value, not a field promise · review
The only panel in this group with adjustable stands and a current checker — and the only one whose twenty-four per cent is an increase over other cells rather than an efficiency.
A NESTOUT portable solar panel with dual USB-A ports, 28 W power generation, in durable water-resistant ripstop nylon, foldable, with adjustable stands, four panels.
ELECOM states an IF Design Gold Award for the NESTOUT Outdoor Series; panels using high-quality SunPower MAXEON cells “for up to a 24% increase in efficiency compared to traditional solar cells”; dual USB-A ports for phones, tablets and earbuds; a built-in current checker LED display showing the solar power generation going into the USB ports; two built-in adjustable stands; a durable water-resistant ripstop nylon bag with two mesh storage pouches and three exterior loops for hanging from trees, tents or cables.
No efficiency figure. No dimensions. No weight. No IP rating. No test conditions.
The distinction this page exists to make.
“Up to a 24% increase in efficiency compared to traditional solar cells.” An increase, against a baseline the listing does not name.
The two FlexSolar panels in this group publish 24 per cent as a conversion rate. A rival publishes 25.4 per cent the same way.
So the same number appears three times on this shelf with two different meanings, and only one of the three is the figure this shelf’s introduction asks for — the stated conversion efficiency that tells you how much panel you carry per watt.
The only ones in this group.
This shelf’s introduction makes the point: the angle you can set is what actually changes yield through the day. A panel flat on the ground sees the sun properly for an hour either side of noon.
One rival here asks for 45 degrees facing direct sunlight and supplies nothing to hold it there. This one supplies two adjustable stands, which also lets a four-panel array be set across a slope rather than only along it.
What a solar panel otherwise never tells you.
A bad angle, a shaded cell, a cable that is not seated — none of them announces itself. The phone charges slowly and the reason is invisible.
An LED showing the generation reaching the USB ports makes that actionable: move the panel until the figure rises. Two rivals here publish a charging-or-not LED, which is a smaller thing.
The port set, in full.
No USB-C, and therefore no Power Delivery profile — which this shelf’s introduction makes the thing that decides whether a panel can charge a phone or a laptop directly. Two rivals here have USB-C; one of those carries PD2.0, and one carries 5 volts with a modern plug.
Four panels of 28 watts into two USB-A sockets is a phone and a tablet.
ELECOM’s instructions carry the ports and the stands. Nothing here replaces them, and nothing on this page describes any product as safe.
The American Amazon store was listing it at about $130 at the time of writing.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
| Stated peak output | 28 W of power generation, across four panels |
|---|---|
| Test conditions stated | Not published |
| Cell type | SunPower MAXEON cells, named by maker and series |
| Stated efficiency | Not published as an efficiency. The listing states "up to a 24% increase in efficiency compared to traditional solar cells", which is an increase and not a conversion rate |
| Port set | Dual USB-A |
| Power Delivery profiles | None. USB-A only |
| Controller included | Not published. A current checker LED display shows the generation reaching the USB ports |
| Folded dimensions | Not published |
| Unfolded dimensions | Not published |
| Weight | Not published. The shipping weight is about 771 g (27.2 oz) |
| IP rating | Not published. The bag is stated water-resistant ripstop nylon |
| Amazon reference | B09TKD9KSJ |
| EAN | 4549550221139 |
No, and this is the distinction worth taking away from the page. The listing states that the panels use SunPower MAXEON cells "for up to a 24% increase in efficiency compared to traditional solar cells" — an increase measured against an unnamed baseline, not a conversion rate. The two FlexSolar panels in this group publish 24 per cent as a conversion rate and a rival publishes 25.4 per cent the same way. The same number appears three times on this shelf with two different meanings, and only one of the three is the figure this shelf's introduction asks for.
The yield, through the day. This shelf's introduction says the kickstand matters because the angle you can set is what actually changes output: a panel flat on the ground sees the sun properly for an hour either side of noon and poorly the rest of the time. This is the only panel in this group with stands at all — one rival asks for 45 degrees facing the sun and supplies nothing to hold it there. Two adjustable stands on a four-panel array also mean the array can be set across a slope rather than only along it.
Knowing whether the panel is working. A solar panel with no display gives no sign of a bad angle, a shaded cell or a cable that is not seated — the phone simply charges slowly, and the reason is invisible. An LED showing the generation reaching the USB ports turns that into something you can act on by moving the panel until the figure rises. No other panel in this group publishes one; two publish an LED that says charging or not charging, which is a different and smaller thing.
Close prices, same category: comparable camping gear. We keep only the specifications all of them publish, because a column with gaps compares nothing.
| Model | Price | Stated peak output | Test conditions stated | Cell type | Stated efficiency |
|---|---|---|---|---|---|
| ELECOM NESTOUT 28 W, 4 panels | $130 | 28 W of power generation, across four panels | Not published | SunPower MAXEON cells, named by maker and series | Not published as an efficiency. The listing states "up to a 24% increase in efficiency compared to traditional solar cells", which is an increase and not a conversion rate |
| BigBlue BB 401 28 W charger | $75 | 28 W | Not published | Advanced N-type solar cells on a shadow-free surface with no metal lines on the front panel, stated for superior low-light efficiency | 25.4 per cent — the highest figure published in this group |
| FlexSolar FLC-E6 40 W panel | $57 | 40 W, with the 19 V DC port rated at 40 W maximum | Not published | Advanced monocrystalline cells with ETFE laminate coating | 24 per cent solar conversion rate |
| FlexSolar E 10 W folding panel | $25 | 10 W maximum under direct sunlight | Not published — as on all four panels in this group | High-efficiency monocrystalline A+ cells with ETFE film lamination | 24 per cent energy conversion rate |
A pitch where the panel is set up, angled and left for the day
Amazon reports what buyers took in the month before this page was last checked: at least 300.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for camping and hiking gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
28 W · 25.4% N-type cells · two USB-C and one USB-A, 5 V/4.8 A total · IP44
The highest stated efficiency in this group at 25.4 per cent, from N-type cells on a shadow-free face — and the only listing here that says outright it will not charge a laptop or a power station.
Best for: Three phones at once, and nothing bigger
≈ $75
40 W · QC3.0 USB-A + PD2.0 USB-C 18 W each + 19 V DC 40 W · IP67 · 800 g (28.2 oz)
The only panel in this group with three kinds of output and a Power Delivery profile — forty watts through a 19-volt DC port, or eighteen each through USB-C and USB-A.
Best for: A small power station and a phone from the same panel
≈ $57
10 W · 24% monocrystalline · IP67, junction box excluded · 300 g (10.6 oz) · USB-A only
The smallest and lightest panel in this group — ten watts in three hundred grams — with a 24 per cent cell efficiency, an IP67 face and a single USB-A socket.
Best for: A phone and a head torch on a multi-day walk, and nothing larger
≈ $25
