A solar power bank is a power bank with a built-in solar panel. This allows you to charge the power bank not only via a wall socket or USB port, but also using sunlight. This makes this type of power bank especially useful for times when you're unsure about your constant access to power. Think of camping, festivals, hikes, road trips, outdoor vacations, home emergencies, or simply long days on the road.

The biggest difference from a regular power bank isn't just the solar panel itself, but especially the added security you get. A standard power bank works perfectly as long as it's fully charged beforehand. A solar power bank also gives you an extra way to get energy if your schedule changes or when charging from a wall socket isn't possible.

A solar power bank is especially a good choice if you recognize yourself in one or more of the following situations

• You are regularly outside and do not want to be dependent on one charging moment

• You often use navigation, camera, music or a flashlight while on the road

• You want a reliable power bank as part of an emergency kit

• You travel a lot and are looking for backup for hotels, airports and long travel days

It's important to know that solar charging is a supplement. It's not a replacement for USB charging if you want to fully charge your power bank quickly.

Solar charging certainly works, but it's important to have realistic expectations. Solar charging is most effective in direct sunlight, with a good position of the panel facing the sun, and sufficient time. This makes it ideal for charging on the go and maintaining your power bank's energy level.

What's usually less realistic is fully charging an empty power bank in a single afternoon using only sunlight. Therefore, consider solar charging primarily as a way to add extra energy and prevent your power bank from running out completely.

How to get the most out of solar charging

• Place the solar panel in direct sunlight and not behind glass

• Point the panel as directly towards the sun as possible

• Avoid shade, even small shadows can significantly reduce yield

• Give it time and use solar charging as a top-up during the day

For many users, the real benefit lies in the combination. You leave with a fully charged power bank and use the solar panel to supplement capacity on the go.

The choice between a 20,000 mAh and 30,000 mAh solar power bank is mainly a trade-off between compactness and extra energy reserve.

A 20,000 mAh solar power bank is perfect for you if...

• You are looking for a reliable power bank for day trips, weekend getaways and festivals

• You prefer a slightly more compact and lighter size

• You usually want to charge one or two devices at the same time

• You find fast charging via USB-C important

A 30,000 mAh solar power bank is a better fit if...

• You're taking longer trips or are off-grid for several days in a row

• You regularly want to charge multiple devices, also for others

• You consciously want to use the power bank as emergency power

• You want extra margin so that you don't have to think about remaining capacity as quickly

For example, the product page for the 30,000 mAh version mentions that this model features four solar panels and an extended design that allows it to charge multiple devices simultaneously. The 20,000 mAh version, on the other hand, emphasizes fast USB-C charging, wireless charging, and additional outdoor features.

How often you can charge your phone depends on several factors

• The capacity of your phone's battery

• Charging loss, which always occurs with power banks

• The way of charging, with cable or wireless

In practice, some energy is always lost through the conversion of voltage and heat. Therefore, it's wise not to rely on the maximum capacity stated on paper.

This is how you make a realistic estimate

• Assume a smartphone battery of approximately 4000 to 5000 mAh

• Please take into account loss, which means you will never use the full power bank capacity

• With 20000 mAh you can expect multiple full charges in many situations

• With 30000 mAh you have more space and can go longer, even when charging other devices

Wireless charging is slightly less efficient than charging with a cable. For maximum efficiency, a cable is usually the best choice, while wireless charging is primarily about convenience.

Yes, these solar power banks are designed to charge multiple devices simultaneously. This can be done via various connections and, depending on the model, also via wireless charging.

Please take the following into account

• If charging speed is important, it's best to charge one device at a time via USB-C

• When charging multiple devices at the same time, the power is distributed, which can make charging slightly slower.

• Wireless charging is useful as an extra option, for example in addition to a device that you charge with a cable

A practical approach is to charge your phone during the day and then fully charge the power bank itself as soon as you have access to power in the evening. This prevents everything from running out at once.

Charging via USB-C is usually the fastest and most efficient, especially if your device supports fast charging. This is the best option if you want to charge your phone or tablet as quickly as possible.

Wireless charging is all about convenience. You place your phone on the charging pad and it charges, as long as your device is Qi-compatible. Keep in mind that wireless charging is slightly less efficient and can therefore be a bit slower.

When do you choose which option?

• USB-C when speed and efficiency matter

• Wireless charging when you want convenience and don't have a cable at hand

For a stable wireless charging experience, we recommend placing your phone centrally on the charging pad and removing any thick cases or metal accessories.

Charging via sunlight depends heavily on factors such as (naturally) the sun's intensity, the angle of the panel, the temperature, and whether you're charging devices simultaneously. Therefore, solar charging is primarily suitable for top-up charging.

Charging via cable is the fastest way to get your power bank fully charged again. This is ideal for use at home, in the car, or anywhere you have access to power.

A handy routine is to always travel with a fully charged power bank and use the solar panel to add extra energy on the go.

Solar power banks are ideal for camping, festivals, outdoor activities, and emergency situations. They offer a large capacity, allow you to charge multiple devices, and offer an additional charging option via sunlight.

In addition, these power banks often have useful extras such as a built-in flashlight and an SOS mode, which can be of great value, especially in the dark or in emergencies.

For a complete emergency kit, it's wise to consider not only the power bank but also a charging cable that you actually use, an adapter for home or car use, and a designated location where you can store and check the power bank regularly.

These solar power banks are designed with outdoor use in mind and are described as rugged, waterproof, and shockproof. This means they can easily withstand rain, dust, sand, and the minor bumps that are almost inevitable during travel, camping, or everyday use on the go.

In practice, water-resistant means that rain showers, wet grass, or humid environments won't pose a problem. However, it doesn't mean the power bank is completely waterproof. Therefore, submerging it in water or exposing it to high moisture for long periods is not recommended. The ports, in particular, remain a point of attention.

Here's how to deal with it wisely:

• Close all ports properly when using the power bank outdoors.

• Do not leave it unnecessarily in wet conditions

• Dry the power bank before putting it back in your bag

Shock resistance ensures that a drop or impact usually won't cause immediate damage. This makes these power banks suitable for active situations like hiking, cycling, festivals, and outdoor vacations. However, common sense remains important. Avoid hard knocks and store the power bank safely when not in use.

Designed for convenience on the go, these solar power banks feature multiple built-in cables and connectors. This allows you to charge directly in many situations without having to find or carry separate cables.

In practice, this means you'll almost always have a suitable connection for your smartphone or other device. This is especially convenient during travel, festivals, or outdoor activities, where you don't always want to have everything at hand.

However, it might be smart to take one extra cable with you:

• If you also use a tablet, e-reader or other device with a specific connection

• If you want to charge faster with your own cable that supports fast charging

• If you want to charge multiple devices simultaneously without relying on built-in cables

Think of built-in cables as convenience and security. A separate cable is primarily an extra backup for specific situations.

In many cases, it's technically possible to charge the power bank while simultaneously charging a device. This is also called pass-through charging. While this is possible, it's not always the most efficient way to charge.

If you have access to power, it's usually best to fully charge the power bank itself first and then your devices. This way, you maximize the charging capacity and prevent unnecessary energy loss.

There are situations where simultaneous charging can be useful

• In emergency situations where you only have one power source

• When you have access to power for a short time and need quick accessibility

• If you mainly charge slowly and speed is less important

Please note that charging is often slower in this situation, as the power is distributed between the power bank and the connected device.

These solar power banks feature multiple built-in protections designed to protect both the power bank itself and your connected devices. These include protection against overheating, overvoltage, short circuits, and overload.

In practice, this means you can safely charge your phone, tablet, or accessories, even during longer sessions. This is especially reassuring when using outdoors, as conditions like heat and sunlight can put extra strain on your battery.

You can also contribute to safe use by:

• Preferably use high-quality cables that are suitable for the power of your device.

• Do not place your phone and power bank unnecessarily in direct sunlight while charging

• Place the power bank on a stable surface when charging quickly

By following these simple guidelines, you will not only extend the lifespan of your devices, but also that of the power bank itself.

In many cases, a solar power bank is allowed on the plane, provided it's carried in your carry-on luggage. Power banks are generally not permitted in checked baggage due to safety regulations regarding lithium batteries.

The exact requirements may vary by airline, for example, regarding maximum capacity or the number of power banks you can take. It's therefore always wise to check this beforehand.

Practical tips for traveling with a power bank

• Always take the power bank with you in your hand luggage

• Switch off the power bank during transport

• Make sure the connections are not accidentally activated in your bag

This way you avoid surprises at the security check and you can travel carefree with your power bank.

Besides capacity and solar charging, these solar power banks offer additional features that are especially valuable outdoors. These features are designed to make you more independent and better prepared during travel and outdoor activities.

Examples of practical extras

• A built-in LED flashlight for use in the dark

• An SOS mode for emergency situations

• Displays that show you at a glance how much energy you have left

These features are especially useful for camping, evening walks, festivals, and situations where you don't have other tools at hand. They make the power bank more than just a charger, but also a handy tool in the field.

Proper maintenance significantly impacts the lifespan of your solar power bank. A few simple habits will ensure it remains reliable, even if you don't use it daily.

Practical maintenance tips

• Store the power bank preferably at room temperature.

• Do not leave it in a hot car or in direct sunlight for long periods of time.

• Charge the power bank occasionally if you do not use it for a long time.

• Keep the solar panel clean so that sunlight is optimally absorbed

A good habit is to check the battery level periodically, for example, once a month or quarter. This way, you can be sure the power bank is ready to use when you need it.