Updated February 09, 2020 by Christopher Thomas

The 7 Best Solar Backpacks

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This wiki has been updated 24 times since it was first published in September of 2015. Instead of planning outings around the time and distance between power outlets, get a solar backpack to keep smartphones, tablets, laptops and music players charged up wherever the trail takes you. With a selection from our handy assortment of hiking, camping and commuter-friendly designs, you can do your bit for renewable energy and juice up those electronic devices while you're on the move. When users buy our independently chosen editorial recommendations, we may earn commissions to help fund the Wiki. If you'd like to contribute your own research to the Wiki, please get started by reviewing this introductory video.

1. Voltaic Systems OffGrid

2. Energizer PowerKeep Pro

3. Voltaic Systems Converter

Editor's Notes

February 06, 2020:

While it seems like there are a ton of worthwhile solar backpacks out there, quite a few of them don't seem to be made well, from the backpack itself to the solar panel, regulator, and battery pack -- if a battery is even included. So we dug deep to figure out just which are worth your time and money. The Voltaic Systems OffGrid and Voltaic Systems Converter are two of the most popular, and while they're somewhat costly, we're comfortable with the reliability and long-term durability. The Energizer PowerKeep Pro costs only about $100 and seems to hold up the Energizer name quite well. The SunnyBag Iconic is just a bit more expensive and is a large and convnient bag even before you consider its integrated solar panel. The same is true of the XD Design Bobby Tech, aside from the price -- it's extremely expensive but is also engineered and manufactured with the quality you'd expect from such a costly model.

There are a couple that are relatively affordable and happen to occupy somewhat specialty niches. The Eceen Daypack is remarkably lightweight and rolls up into one of its pockets, so it's great for taking along on a camping trip so you can tote your most useful gear around during day hikes and not worry about your phone, GPS, or camera battery dying. The Z ZTarx Soul Gear is essentially a high-tech roll-top waterproof bag, and although it's not recommended to fully submerge it in water, it should serve most aquatic purposes well.

If none of these are big enough for your purposes, there's always a DIY option available. If you pick up your own portable solar panel and battery bank, you can attach it as you see fit to a day hiking or internal frame backpack and you could end up with something notably more functional than a pre-built solar backpack, though you'll likely spend just as much, if not more.

4. SunnyBag Iconic

5. Eceen Daypack

6. XD Design Bobby Tech

7. Z ZTarx Soul Gear

Power In The Days To Come

To understand how these packs work, it helps to understand how solar panels work.

Look to the horizon, and tell me if you don't read apocalyptic omens there. If you don't, you're not looking hard enough. Of course, the impending collapse of functioning society as we know it isn't the only reason for you to invest in a solar backpack, but it is the most exciting to talk about.

Sure, you might want to keep your camera and cell phone batteries charged when you're hiking in beautiful wildernesses, or be able to rely on a constant, free source of power when hopping around from country to country without a converter, but isn't it more thrilling to think that this backpack might someday not only be a convenient source of natural power, but also your only source of electricity?

Either way, the solar backpack is a life saver. By simply adhering a series of solar modules to the back and top areas of a simple backpack, these manufacturers have turned your carry-all into its own veritable power plant.

To understand how these packs work, it helps to understand how solar panels work. Essentially, a solar panel is comprised of a ton of little power pods called PV (photovoltaic) cells. These cells work like Velcro in a sense, as they each have a complimentary side to them, one negatively charged, the other positively charged.

The respective charges of each are the result of doping either side (both of which are silicon-based) with either boron or phosphorus. When boron and silicon combine there are holes left over by boron's deficiency in the valence electrons needed to form bonds to other substances. When phosphorus and silicon combine, the opposite is true, and an extra electron exists where the atoms meet. Thus, the boron-doped silicon carries a positive charge, where the phosphorus-doped silicon carries a negative charge.

In the space where the two sides meet, the extra electrons on the phosphorus side jump over to fill the holes in the boron side, creating an electrical field in the space between, called the depletion zone.

When a photon of light passes through a PV cell's depletion zone, it knocks an electron loose of its hole and either side will scramble to balance the depletion zone back out, ejecting the free-floating electron toward and along a metal wire, forming the electrical current.

How Far Will You Go?

Choosing a solar backpack may seem like an aesthetic decision at the outset, and it's true that you want a pack that you'll actually be willing to wear out in the sunlight. Otherwise, you might as well pick up a simple backpack without any of that glorious solar technology to it, and that would be a shame.

These tend to be a little heavier than the charge-as-you-go style of bag, but they prove more useful in the long run.

Once you've narrowed down our list to a smaller number of stylishly pleasing packs, you can start to evaluate them based on their features, and the features that will be most important to you depend on the distances you plan to travel.

If you're going for longer stretches without access to reliable electricity, you'll want to focus on a pack that can produce more juice than its competition from less sunlight, and ideally one with an internal power reservoir for storage. These tend to be a little heavier than the charge-as-you-go style of bag, but they prove more useful in the long run.

You might just want to keep your phone charged while you're on the go in another country, though, just to make sure you have enough power to run any apps you need for navigating foreign soil. The smaller, lighter bags with just a panel and a plug will probably be enough for you.

Power Pulled From The Sun

While a French physicist named Edmund Bequerel first made note of a photoelectric effect in 1839, the first photovoltaic module as such wouldn't come into existence until Bell Laboratories built it in 1954. Of course, this was well after Albert Einstein won the Noble Prize in 1921 for his work on the photoelectric effect among other things.

Another big boost in the development of solar technology came from NASA in the 1960s, who began using solar power on their spacecraft and satellites in earnest.

Those early modules made by Bell and others were small and pretty inefficient, with short lifespans and grotesque price tags, but they were necessary to the development of the much more durable, less expensive solar technology we use today. Another big boost in the development of solar technology came from NASA in the 1960s, who began using solar power on their spacecraft and satellites in earnest.

In recent years, the vast majority of research into solar electricity has been geared toward the consumer market, with companies offering to share in the investment to help offset initial costs to homeowners.

In the public sector, you'll already have noticed the inclusion of solar arrays on street lamps and road signs, and that's just the beginning. A small portion of America's iconic Route 66 roadway is getting a huge solar makeover, replacing its pavement with a special, experimental solar street which is designed to power nearby communities while directly melting ice on roadways and providing driver feedback about animal crossings, accidents, and more.

Christopher Thomas
Last updated on February 09, 2020 by Christopher Thomas

Building PCs, remodeling, and cooking since he was young, quasi-renowned trumpeter Christopher Thomas traveled the USA performing at and organizing shows from an early age. His work experiences led him to open a catering company, eventually becoming a sous chef in several fine LA restaurants. He enjoys all sorts of barely necessary gadgets, specialty computing, cutting-edge video games, and modern social policy. He has given talks on debunking pseudoscience, the Dunning-Kruger effect, culinary technique, and traveling. After two decades of product and market research, Chris has a keen sense of what people want to know and how to explain it clearly. He delights in parsing complex subjects for anyone who will listen -- because teaching is the best way to ensure that you understand things yourself.

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