In today’s world, having a reliable power source on the go has become essential. Whether you’re hiking through the mountains, traveling, or just want to be prepared for a power outage, a portable solar power bank can provide that extra peace of mind. After years of relying on traditional power banks, I decided to explore the growing market of solar-powered options. What I found was a range of choices, each with its own strengths and weaknesses. In this guide, I’ll walk you through the factors to consider when selecting the best portable solar power bank, and I’ll share my insights on the best options available.
Table of Contents
Why Choose a Solar Power Bank?
Before diving into the specifics of how to choose one, it’s important to understand why a solar power bank can be a game-changer. Unlike traditional power banks, which need to be charged via an outlet, solar power banks can recharge themselves using the sun. This feature makes them ideal for outdoor activities, camping, or emergency situations. They are a sustainable, environmentally friendly option that reduces reliance on traditional electricity sources.
Factors to Consider When Choosing a Solar Power Bank
Choosing the right solar power bank requires understanding several key factors. Below, I’ll break down each of these aspects and explain why they matter.
1. Capacity (mAh)
The first and most crucial factor to consider is the battery capacity, measured in milliampere-hours (mAh). This tells you how much energy the power bank can store. Generally, a higher mAh means a greater capacity to charge your devices multiple times. For example, a 20,000mAh power bank can charge most smartphones at least 4-6 times before needing a recharge.
Here’s a quick guide to what different mAh ratings generally offer:
| Battery Capacity (mAh) | Charging Capacity (Smartphones) | Ideal For |
|---|---|---|
| 10,000 – 12,000 | 2-3 full charges | Light use, single-device charge |
| 20,000 – 25,000 | 4-6 full charges | Multiple devices, extended trips |
| 30,000+ | 6+ full charges | Heavy use, multiple devices, long trips |
I find that for most outdoor trips or emergencies, a capacity of around 20,000mAh is a sweet spot. It provides ample power for multiple devices while still being portable enough for most outdoor activities.
2. Solar Panel Efficiency
The efficiency of the solar panel is another crucial factor to keep in mind. Solar power banks use built-in solar panels to recharge the battery. However, not all solar panels are created equal. The size and quality of the solar panel will determine how fast the power bank charges in direct sunlight.
If you’re planning on using the solar power bank as your primary source of power, a higher efficiency panel is important. Keep in mind that even high-efficiency panels may take several hours to recharge a fully drained battery in ideal sunlight. For instance, a solar power bank with a 5W solar panel may take 10-12 hours to recharge fully, while one with a 10W panel might take around 6-8 hours.
Here’s a comparison of typical panel types:
| Panel Type | Power Output (Watts) | Charging Time (in Direct Sunlight) |
|---|---|---|
| 5W | 5 watts | 10-12 hours |
| 10W | 10 watts | 6-8 hours |
| 15W+ | 15+ watts | 4-6 hours |
The higher the wattage, the faster it recharges. If you’re out in the wilderness, you might not always have access to ideal sunlight, so charging speed can vary greatly based on weather and conditions.
3. Size and Weight
When I started looking into portable solar power banks, the size and weight of the device quickly became a consideration. The larger the capacity and solar panel, the heavier the power bank tends to be. If you’re heading on a backpacking trip or need to keep your gear light, this factor will play a significant role in your choice.
I recommend balancing the need for capacity with weight. If you’re traveling light, you might want to opt for something in the range of 10,000mAh, which is portable and won’t weigh you down. However, if you’re going for a long trek or need to power multiple devices, a larger model (20,000mAh or more) might be necessary, but be prepared for the extra bulk.
4. USB Output and Charging Speed
Not all power banks have the same charging output, which can affect how quickly they charge your devices. Most portable power banks offer USB-A ports, while more advanced models offer USB-C for faster charging. If you have a smartphone that supports USB-C, choosing a solar power bank with this output can reduce the charging time significantly.
Additionally, some power banks come with multiple ports, allowing you to charge multiple devices at once. If you’re in a group, or you plan to charge devices like a tablet, camera, or even a laptop, having more than one output is important.
| Port Type | Charging Speed | Best For |
|---|---|---|
| USB-A | 5V/2.1A (10W max) | Phones, basic devices |
| USB-C | 5V/3A (15W max) | Faster charging for newer phones, laptops |
| QC (Quick Charge) | 9V/2A (18W max) | Fast charging for compatible devices |
5. Durability and Water Resistance
If you plan on using your solar power bank outdoors, the durability of the device is something you can’t overlook. Many solar power banks come with rugged, shockproof, and water-resistant designs. This can be especially helpful if you’re using it in the rain or in extreme conditions.
Look for power banks that are rated with an IP (Ingress Protection) number. The higher the number, the more resistant the bank is to water and dust. For example, an IPX4 rating means it’s resistant to splashing water, while an IP67 rating means the power bank is fully waterproof and dustproof.
6. Price and Brand Reputation
While I never like to suggest buying based solely on price, it’s important to consider how much you’re willing to spend on a solar power bank. You can find models ranging from budget options under $30 to high-end models costing upwards of $100. Generally, the more you spend, the better the quality, features, and durability.
Some well-known brands in the solar power bank industry include Anker, Goal Zero, and RAVPower. These brands are known for their reliability and performance, which is something I look for when making any purchase.
Top Solar Power Banks: A Comparison
To make things clearer, I’ve put together a comparison of some of the top-rated solar power banks available today. This should help you make an informed decision based on your specific needs.
| Brand | Model | Capacity (mAh) | Solar Panel | Output Ports | Weight (lbs) | Price Range |
|---|---|---|---|---|---|---|
| Anker | PowerCore Solar | 20,000 | 15W | 2 (USB-A) | 0.8 | $60 – $80 |
| Goal Zero | Sherpa 100AC | 25,600 | 10W | 3 (USB-A, USB-C) | 1.3 | $200 – $250 |
| RAVPower | Solar Charger | 24,000 | 10W | 3 (USB-A) | 1.0 | $40 – $60 |
| BigBlue | 28W Solar Charger | 20,000 | 28W | 2 (USB-A) | 0.5 | $40 – $60 |
Conclusion: Which Solar Power Bank is Best for You?
After researching the best portable solar power banks, I’ve concluded that there isn’t a one-size-fits-all solution. The ideal choice depends on your specific needs and usage. If you’re looking for a reliable, affordable option for basic outdoor use, I’d recommend going for something in the 20,000mAh range with a 10W solar panel. If you need something more rugged and capable of charging multiple devices, investing in a higher-end model like Goal Zero’s Sherpa 100AC might be the way to go.
Ultimately, I believe the best portable solar power bank is the one that strikes a balance between capacity, charging speed, size, and durability—based on how you plan to use it. With the right solar power bank, you’ll never have to worry about running out of power, whether you’re camping under the stars or navigating a power outage at home.
Happy charging!
