7 Best Solar Panels for Backpacking

PD 25W on USB-C is the fastest charging standard in this group, and this is one of two panels here that offers it. Add a second USB-C port, a USB-A, 35W of rated capacity, 25.4% cells and an IP68 body, and you have a three-port panel that covers a phone, a camera and a bank at once.

The ports are why we hand this to anyone whose pack includes a camera, a tablet or a power bank that takes real current. Charging a phone from a 5V panel is a waiting game; with PD on the C port the wait shrinks, and with three devices connected you are not taking turns. The two panel strings run on separate circuits, so a shadow across one half does not shut the whole array down — a small thing that matters a lot when you are moving and the light keeps changing.

The cost is weight: 1.54 lb, roughly twice the lightest panels here. On a fast-and-light trip that is an argument you will not win; when the electronics matter, it is the best trade in this guide. One habit worth forming either way — keep whatever you are charging in the panel’s shade. A phone left in full sun beside the panel can overheat and stop charging, which reads as a panel failure and is not.

The label says 25W, and a single port in full sun will not hand you 25W — no panel here will. Read the 25W as the array’s best-case harvest and the ports as the real limit: USB-C at 5V/3A, USB-A at 5V/2.4A, and no PD on either.

What you get for that is the smallest folded package in this guide — 4.65 by 6.42 by 1.38 inches, 13.44 ounces — with a USB-C to USB-C cable, an elastic strap and two carabiners in the box. Hanging it on a pack takes about two seconds, and there were long stretches of our testing when we forgot it was there until something needed charging.

It is a top-up panel, and a quick one for its size. Buy it if the trip is fast-and-light and the job is keeping a phone and a headlamp alive between resupplies; step up to the 35W BigBlue or the top pick if a power bank or a tablet has to charge in a reasonable time. The 5V ports are the honest limit and the weight is the reason to forgive them.

The least expensive panel here is also the simplest: 15W, one USB-A port, and a laminate that unfolds to a 23.5 by 8.8 inch strip before folding down to roughly the size of a small tablet. FlexSolar rates the port at 5V/3A max with an integrated chip handling device detection, and the panel is IP67.

We treat it as a phone charger and nothing else, which is a fair description of what most backpackers need. Fifteen watts through a single USB-A port keeps a phone and a headlamp alive over a long weekend. It will not run a tablet, nothing about it is fast, and with one port you charge one thing at a time — pick it when budget is the binding constraint, not when a camera kit is coming along.

The annoying part is that FlexSolar does not publish a weight, which is exactly the number a backpacker wants first. Weigh the folded size instead: it packs about like a small tablet, and a 15W array will never be the heaviest thing in your pack. If you need a figure in grams, the BigBlue 25W publishes one.

This is the 25W version of the same FlexSolar design, and it adds the thing the cheaper model lacks: a USB-C port alongside the USB-A, both rated 5V/3A for two devices at once. It folds to 7.7 by 5.1 by 1.5 inches at 1.2 lb, ships with two carabiners, and wraps its cells in a three-layer ETFE and EVA laminate rated IP67.

MPPT is the interesting line on the spec sheet — a harvesting method built to hold output as light shifts, and the sort of feature you notice on a day of broken cloud rather than at noon in July. The 23.2% cells sit a step behind the top pick’s 25.4%, which is one more reason to think of this as the value version rather than the equal.

Where it lands for us: the cheapest route to USB-C on a folding panel here, a bit heavier than the top pick, with the same 25W ceiling and a lower water rating. The case for it is the port and the price, and both are real. Nothing here is best in class, and nothing is a problem either — on a three-day trip with a phone and a bank it does the same job.

Fifty watts, three outputs and a two-pound body: this is the panel for basecamp or the car, not for the climb. The outputs are the interesting part — USB-A with QC 18W, USB-C with PD 30W, and a DC port at 18V/2.78A with a set of adapter tips for power stations.

That DC run separates it from everything else here. If you are feeding a portable power station, a panel with a matching connector and the right tip in the box saves you a car charger and a wall adapter. It still works as a straight USB panel, with fast charging on both USB ports, and 50W of array gives more margin on a hazy afternoon than the 25W panels manage.

Two things to check before you commit. The cable runs out of the panel are short, so plan on parking the power station right beside it. And confirm your station’s solar input limit before you connect — overrunning it is the quickest way to have the station refuse the charge. The fold-out legs and their rivets are the other parts to handle with care.

For backpacking, 2.1 lb ends the conversation for most people, and that is the right call. This is the panel for the trip where a car or a basecamp carries the weight and the electronics matter — as a power-station companion it is the best value per watt here, and as a pack-carried panel it is the wrong tool.

Forty-five watts, three ports and 1.7 lb: this answers a specific question — how do I charge two USB-C devices without carrying the two-pound 50W option? On the numbers it is the second-most powerful panel here, with PD 25W on the first C port, a second C port, a USB-A, 26% cells and an IP68 surface. We think that is a fair trade for the weight, and it is why this sits just behind our main picks rather than among them.

Where it gives ground is packability, and not because 1.7 lb is heavy in absolute terms — it is that 1.7 lb buys a folded package the size of an iPad, which fits into a pack very differently from the pocket-sized 25W panels. On a trip with a camera bag and a power bank that is fine. On a trip where every item justifies itself against food, it is not.

The design is sound: the laminated surface is the same family as the other ETFE panels here, the storage pouch is an inclusion several rivals skip, and the port layout suits a two-device habit. Longevity across seasons of folding is the open question, and only time answers it.