# 7 Best Solar Power Banks for Travel & Remote Work. Power bank solar 50000mah

## Battery Charge Time Calculator

Use our battery charge time calculator to easily estimate how long it’ll take to fully charge your battery.

## Battery Charge Time Calculator

Tip: If you’re solar charging your battery, you can estimate its charge time much more accurately with our solar battery charge time calculator.

### How to Use This Calculator

Enter your battery capacity and select its units from the list. The unit options are milliamp hours (mAh), amp hours (Ah), watt hours (Wh), and kilowatt hours (kWh).

Enter your battery charger’s charge current and select its units from the list. The unit options are milliamps (mA), amps (A), and watts (W).

If the calculator asks for it, enter your battery voltage or charge voltage. Depending on the combination of units you selected for your battery capacity and charge current, the calculator may ask you to input a voltage.

Select your battery type from the list.

Optional: Enter your battery state of charge as a percentage. For instance, if your battery is 20% charged, you’d enter the number 20. If your battery is dead, you’d enter 0.

Click Calculate Charge Time to get your results.

## Battery Charging Time Calculation Formulas

For those interested in the underlying math, here are 3 formulas to for calculating battery charging time. I start with the simplest and least accurate formula and end with the most complex but most accurate.

### Formula 1

Formula: charge time = battery capacity ÷ charge current

Accuracy: Lowest

Complexity: Lowest

The easiest but least accurate way to estimate charge time is to divide battery capacity by charge current.

Most often, your battery’s capacity will be given in amp hours (Ah), and your charger’s charge current will be given in amps (A). So you’ll often see this formula written with these units:

charge time = battery capacity (Ah) ÷ charge current (A)

However, battery capacity can also be expressed in milliamp hours (mAh), watt hours (Wh) and kilowatt hours (kWh). And your battery charger may tell you its power output in milliamps (mA) or watts (W) rather than amps. So you may also see the formula written with different unit combinations.

charge time = battery capacity (mAh) ÷ charge current (mA) charge time = battery capacity (Wh) ÷ charge rate (W)

And sometimes, your units are mismatched. Your battery capacity may be given in watt hours and your charge rate in amps. Or they may be given in milliamp hours and watts.

In these cases, you need to convert the units until you have a ‘matching’ pair.- such as amp hours and amps, watt hours and watts, or milliamp hours and milliamps.

For reference, here are the formulas you need to convert between the most common units for battery capacity and charge rate. Most of them link to our relevant conversion calculator.

Battery capacity unit conversions:

• watt hours = amp hours × volts
• amp hours = watt hours ÷ volts
• milliamp hours = amp hours × 1000
• amp hours = milliamp hours ÷ 1000
• watt hours = milliamp hours × volts ÷ 1000
• milliamp hours = watt hours ÷ volts × 1000
• kilowatt hours = amp hours × volts ÷ 1000
• amp hours = kilowatt hours ÷ volts × 1000
• watt hours = kilowatt hours × 1000
• kilowatt hours = watt hours ÷ 1000

Charge rate unit conversions:

The formula itself is simple, but taking into account all the possible conversions can get a little overwhelming. So let’s run through a few examples.

### Example 1: Battery Capacity in Amp Hours, Charging Current in Amps

Let’s say you have the following setup:

• Battery capacity: 100 amp hours
• Charging current: 10 amps

To calculate charging time using this formula, you simply divide battery capacity by charging current.

In this scenario, your estimated charge time is 10 hours.

### Example 2: Battery Capacity in Watt Hours, Charging Rate in Watts

Let’s now consider this scenario:

Because your units are again ‘matching’, to calculate charging time you again simply divide battery capacity by charging rate.

In this scenario, your estimated charge time is 8 hours.

### Example 3: Battery Capacity in Milliamp Hours, Charging Rate in Watts

Let’s consider the following scenario where the units are mismatched.

First, you need to decide which set of matching units you want to convert to. You consider watt hours for battery capacity and watts for charge rate. But you’re unable to find the battery’s voltage, which you need to convert milliamp hours to watt hours.

You know the charger’s output voltage is 5 volts, so you settle on amp hours for battery capacity and amps for charge rate.

With that decided, you first divide watts by volts to get your charging current in amps.

Next, you convert battery capacity from milliamp hours to amp hours by dividing milliamp hours by 1000.

Now you have your battery capacity and charging current in ‘matching’ units. Finally, you divide battery capacity by charging current to get charge time.

In this example, your estimated battery charging time is 1.5 hours.

### Formula 2

Formula: charge time = battery capacity ÷ (charge current × charge efficiency)

Accuracy: Medium

Complexity: Medium

No battery charges and discharges with 100% efficiency. Some of the energy will be lost due to inefficiencies during the charging process.

This formula builds on the previous one by factoring in charge/discharge efficiency, which differs based on battery type.

Here are efficiency ranges of the main types of rechargeable batteries (source):

Note: Real-world charge efficiency is not fixed and varies throughout the charging process based on a number of factors, including charge rate and battery state of charge. The faster the charge, typically the less efficient it is.

### Example 1: Lead Acid Battery

Let’s assume you have the following setup:

To calculate charging time using Formula 2, first you must pick a charge efficiency value for your battery. Lead acid batteries typically have energy efficiencies of around 80-85%. You’re charging your battery at 0.1C rate, which isn’t that fast, so you assume the efficiency will be around 85%.

With an efficiency percentage picked, you just need to plug the values in to the formula.

100Ah ÷ (10A × 85%) = 100Ah ÷ 8.5A = 11.76 hrs

In this example, your estimated charge time is 11.76 hours.

Recall, that, using Formula 1, we estimated the charge time for this setup to be 10 hours. Just by taking into account charge efficiency our time estimate increased by nearly 2 hours.

### Example 2: LiFePO4 Battery

Let’s assume you again have the following setup:

Based on your battery being a lithium battery and the charge rate being relatively slow, you assume a charge efficiency of 95%. With that, you can plug your values into Formula 2.

1200Wh ÷ (150W × 95%) = 1200Wh ÷ 142.5W = 8.42 hrs

In this example, your estimated charge time is 8.42 hours.

Using Formula 1, we estimated this same setup to have a charge time of 8 hours. Because lithium batteries are more efficient, factoring in charge efficiency doesn’t affect our estimate as much as it did with a lead acid battery.

### Example 3: Lithium Ion Battery

Again, let’s revisit the same setup as before:

First, you need to assume a charge efficiency. Based on the battery being a lithium battery and the charge rate being relatively fast, you assume the charge efficiency is 90%.

As before, you need to ‘match’ units, so you first convert the charging current to amps.

Then you convert the battery’s capacity from milliamp hours to amp hours.

With similar units, you can now plug everything into the formula to calculate charge time.

3Ah ÷ (2A × 90%) = 3Ah ÷ 1.8A = 1.67 hours

In this example, your estimated charge time is 1.67 hours.

### Formula 3

Formula: charge time = (battery capacity × depth of discharge) ÷ (charge current × charge efficiency)

Accuracy: Highest

Complexity: Highest

The 2 formulas above assume that your battery is completely dead. In technical terms, this is expressed by saying the battery is at 100% depth of discharge (DoD). You can also describe it as 0% state of charge (SoC).

Formula 3 incorporates DoD to let you estimate charging time regardless of how charged your battery is.

### Example 1: 50% DoD

Let’s revisit this setup, but this time assume our lead acid battery has a 50% DoD. (Most lead acid batteries should only be discharged to 50% at most to preserve battery life.)

As before, let’s assume a charging efficiency of 85%.

We have all the info we need, so we just plug the numbers into Formula 3.

(100Ah × 50%) ÷ (10A × 85%) = 50Ah ÷ 8.5A = 5.88 hrs

In this example, your battery’s estimated charge time is 5.88 hours.

### Example 2: 80% DoD

For this example, imagine you have the following setup:

As before, we’ll assume that the charging efficiency is 95%.

With that in mind, here’s the calculation you’d do to calculate charge time.

(1200Wh × 80%) ÷ (150W × 95%) = 960Wh ÷ 142.5W = 6.74 hrs

In this example, it will take about 6.7 hours to fully charge your battery from 80% DoD.

### Example 3: 95% DoD

Let’s say your phone battery is at 5%, meaning it’s at a 95% depth of discharge. And your phone battery and charger have the following specs:

As before, we need to convert capacity and charge rate to similar units. Let’s first convert battery capacity to amp hours.

Next, let’s convert charge current to amps.

Because the charge C-rate is relatively high, we’ll again assume a charging efficiency of 90% and then plug everything into Formula 3.

(3Ah × 95%) ÷ (2A × 90%) = 2.85Ah ÷ 1.8A = 1.58 hrs

Your phone battery will take about 1.6 hours to charge from 5% to full.

### Why None of These Formulas Is Perfectly Accurate

None of these battery charge time formulas captures the real-life complexity of battery charging. Here are some more factors that affect charging time:

• Your battery may be powering something. If it is, some of the charge current will be siphoned off to continue powering that device. The more power the device is using, the longer it will take for your battery to charge fully.
• Battery chargers aren’t always outputting their max charge rate. Many battery chargers employ charging algorithms that adjust the charging current and voltage based on how charged the battery is. For example, some battery chargers slow the charge rate down drastically once the battery reaches around 70-80% charged. These charging algorithms vary based on charger and battery type.
• Batteries lose capacity as they age. An older battery will have less capacity than an identical new battery. Your 100Ah LiFePO4 battery may have only have around 85Ah capacity after 1000 cycles. And the rates at which batteries age depend on a number of factors.
• Lithium batteries have a Battery Management System (BMS). Besides consuming a modest amount of power, the BMS can adjust the charging current to protect the battery and optimize its lifespan. iPhones have a feature called Optimized Battery Charging that delays charging the phone’s battery past 80% until you need to use it.
• Lead acid battery chargers usually have a timed absorption stage. After being charged to around 70-80%, many lead acid battery chargers (and solar charge controllers) enter a timed absorption stage for the remainder of the charge cycle that is necessary for the health of the battery. It’s usually a fixed 2-3 hours, regardless of how big your battery is, or how fast your charger.

In short, batteries are wildly complex, and accurately calculating battery charge time is no easy task. It goes without saying that any charge time you calculate using the above formulas.- or our battery charge time calculator.- should be viewed as an estimate.

## Best Solar Power Banks for Travel Remote Work

When you are travelling and working remotely, keeping your devices powered up is essential. Sometimes it’s not always convenient to plug our computers, phones, and cameras into an outlet. But, that’s where power banks come in handy.

In this guide, we’re going to share the best solar power and power banks for travel and remote work.

Power banks are an excellent option whether you’re often on the go, you have a trip coming up, or you want a convenient way to charge your devices while you work from home. We’ve got various options, from compact solar power banks to powerful power banks that can charge multiple devices.

## Why should digital nomads and remote workers consider carrying a power bank?

Digital nomads and remote workers usually work online and are often on the go, so being able to charge devices easily is important. A power bank provides peace of mind that your devices are always powered up or can be conveniently charged if needed.

You can easily travel with power banks and pull them out when your device runs out of juice and needs to be charged. I’ve had a power bank for as long as I’ve been a digital nomad, and I couldn’t imagine living without it. It makes things so much easier knowing I can charge my computer and phone, especially when I want to travel and explore while working.

You can use a power bank to keep many devices charged, including phones, computers, cameras, earbuds, smartwatches, etc.

## How do solar power banks work?

Solar power banks are eco-friendly devices that can be charged by the sun. Where a standard power bank needs to be plugged into an outlet and charged up before you can use it to charge your devices, a solar power bank is placed in sunlight to be charged.

A solar power bank is an excellent option for many digital nomads and remote workers. However, you have to make sure you’re somewhere sunny to charge it up to give it the energy to charge your devices.

You don’t need to be somewhere with sunlight at all times. You’re good to go as long as the sun’s out when you need to charge your solar power bank.

## Best Solar Power and Power Banks for Travel Remote Work

There are various solar power and standard power banks for various travel and remote work styles and needs. There’s something for everyone, from portable and miniature options to power banks that charge multiple devices and outdoor-friendly power banks. Let’s look at the best solar power and power banks for travel and remote work.

### Solar Power and Power Banks Overview

• Best Foldout Solar Power Bank: SOKOO Solar Charger Power Bank
• Best Waterproof Power Bank: BLAVOR Wireless Solar Charger with LED Flashlights and Compass
• Best Miniature Power Bank: T-CORE Power Bank 20000M
• Best Power Bank for Laptops: Poweroak 250W Portable Power Station
• Best Budget Solar Power Bank: SWEYE Solar Power Bank
• Best Lightweight Power Bank: Anker Power Bank, PowerCore
• Best Power Bank for Multiple Devices: MAXOAK 50000mAh 6 Port

### Best Foldout Solar Power Bank: SOKOO Solar Charger Power Bank

Power up anywhere you go with the SOKOO Solar Charger Power Bank. Whether you are or what adventure you’re planning, it’s nice to have a foldable solar power bank that’s easy to pack and take on the go.

The A ADDTOP solar charger charges devices with a USB port, such as smartphones, iPad, cameras, and gaming devices. It has four panels and charges up faster than a single-pane solar panel.

You can charge two devices at once and auto-adjust the current of the access device for the best output. It can also charge most smartphones 8-10 times and iPads 3-4 times until it needs to be placed in the sun again.

If you enjoy exploring outdoors, the SOKOO is also great for this. It’s waterproof and is made to adapt to various conditions. It has a built-in LED flashlight, too.

Wattage: 5 watts

Connector Type: USB A, Micro USB

Total USB Ports: 3

Quick review: Portable foldout solar power bank that’s great for on-the-go and outdoors.

### Best Waterproof Power Bank: BLAVOR Wireless Solar Charger with LED Flashlights and Compass

If you’re interested in the ultimate waterproof power bank, the BLAVOR Wireless Solar Charger with LED Flashlights and Compass is it! This new version is better than ever, with a large battery capacity to charge a smartphone or earbuds about seven times and about four charges for an iPad. And it charges your devices incredibly quickly.

The BLAVOR Wireless Solar Charger’s superb design has earned it the Red Dot Award. It’s shockproof and waterproof, making it suitable for harsh conditions. It’s even made to charge your devices wirelessly, so there’s no need to worry about tangled chords. You can charge two devices at once with this solar charger.

It also has an LED flashlight and compass for outdoor adventures like camping, cycling, hiking, travelling, etc.

Wattage: 72-watt hours

Connector Type: USB, wireless

Total USB Ports: 4

Quick review: Powerful solar chargers flawlessly designed to handle harsh conditions.

### Best Miniature Power Bank: T-CORE Power Bank 20000M

There’s no need to worry about taking too much space with a T-CORE Power Bank 20000M. This miniature power bank is the perfect solution for light packers who don’t want to worry about their devices losing power.

Although the T-Core Power Bank is small, it can fully charge your phone in under half an hour. It also supports 2 USB outputs simultaneously. At total charge capacity, it can charge a phone about four times. It also charges earbuds, smartwatches, and iPads.

One great thing about digital nomads using this power bank is that it’s permitted in a carry-on plane bag as it is 37 Wh, and most aeroplanes require less than 100 Wh to be carried on.

Wattage: 37 Wh

Connector Type: USB Type C

Total USB Ports: 2

Quick review: Compact size is perfect for travelling and taking on the go to keep devices powered up.

### Best Power Bank for Laptops: Poweroak 250W Portable Power Station

Keep all your devices, including your iPad, charged with the Poweroak 250W Portable Power Station. This power bank not only keeps your laptop powered, but you can also plug in mini-refrigerators, cameras, fans, and a GoPro.

It’s perfect for remote workers who enjoy road-tripping and camping!

This Poweroak Power Station runs off a lithium-ion battery with various outputs to charge multiple devices simultaneously. The power station can also be recharged via a wall socket, car outlet, or generator. You can also pair it with a solar panel for solar charging.

While this power station is quite powerful, it’s easy to travel with. Its foldable handle design is handy and makes it easy to carry.

Wattage: 300 watts

Connector Type: wireless charging, DC 12V3A, 12V9A, Pd 45W Type-C, USB-A, and AC230V UK outlet

Quick review: a powerful power bank with various connectors to charge multiple devices, including your laptop.

### Best Budget Solar Power Bank: SWEYE Solar Power Bank

The SWEYE Solar Power Bank is a high-quality, affordable option for keeping your devices charged. It’s also a nice compact size for remote workers who want something easy to travel with.

This power bank is charged by solar energy, but it can also be plugged in to charge. It’s also fast charging so you can be on your way and ready to power up your devices when needed.

Dual USB outputs allow you to charge two devices with the SWEYE Solar Power Bank simultaneously. It also works with various devices, including iPads, earbuds, all smartphones, and more.

Blue LED indicators allow you to conveniently see how much charge you have left on your power bank.

Wattage: 91 watts

Total USB Ports: 2

Quick review: an affordable option for charging up to two devices at once.

### Best Lightweight Power Bank: Anker Power Bank, PowerCore

If you’re looking for a lightweight power bank that works great, the Anker Power Bank, PowerCore is an excellent option! It’s referred to as the “lightest” portable charger of its kind on the market, and its slim size makes it incredibly easy to travel with.

You can charge a smartphone and iPad mini 1-2 times with this before charging the power bank back up. And, since it’s so small, it charges incredibly fast.

The Anker Power Bank has been made with superior safety. Its MultiProtect safety system has temperature control, overcharge protection, and short circuit protection.

Wattage: 24 watts

Connector Type: Micro USB

Total USB Ports: 1

Quick review: the ideal power bank if you’re looking for something simple and lightweight to keep your phone powered up.

### Best Power Bank for Multiple Devices: MAXOAK 50000mAh 6 Port

If you’ve got several devices like a computer, camera, and phone to keep charged, the MAXOAK 50000mAh 6 Port might be your best bet. You can also plug in tablets, earbuds, LED lights, and more.

When the MAXOAK power bank is fully charged, it can charge a computer at least twice and smaller devices 10-20 times. It also has 6 ways to charge your devices. The power bank itself can be fully recharged in under 8 hours.

An advantage that many other power banks don’t have is that this one comes with a 12-month 100% Satisfaction Replacement Warranty. It also comes with various cables and cords and a carrying bag.

Wattage: 185 watts

Connector Type: USB

Total USB Ports: 4

Total DC Outputs: 2

Quick review: a reliable power bank that can charge multiple devices, including bigger pieces like computers and cameras.

Be prepared for your life as a digital nomad with our favourite gear for remote workers:

## Best Solar Power Bank for Backpacking

Raise your hand if you have ever gone off-grid and grudgingly spent several days without contacting your loved ones. While backpacking is always fun and therapeutic, navigating the unknown with uncharged gadgets like smartphones and GPS devices can dampen the excitement. This is why investing in the best solar power bank for backpacking is a must before your next outdoor activity.

## Overall Best Selling Solar Power Bank for Backpacking

### Quadrapro Solar Power Bank With Wireless Dual USB Charging By Frog Co By Frog Co.

Whether you’re in need of some extra power to call for a rescue or you just want to post a picture of a gorgeous view, we believe you should be able to harness the free power of the sun. With a built-in power bank, it offers a compact design that can trav

You might agree that the only constant about the outdoors is the unpredictability of the power supply. Hence, you might still have dead batteries when using electricity-powered power banks. However, you can find the best backpacking solar power bank that is convenient, efficient, portable, and versatile.

In today’s article, we present to you the best solar power bank for backpacking. We also delve deeper by considering lightness and capacity, among other questions you might have for a successful power-charged backpacking endeavor.

## Best Power bank for Ultralight Backpacking

Not all backpacking is the same, as some require you to carry only the lightest and tiniest gear. With that, ultralight backpacking renders your bulky power banks impractical, requiring only the featherweight options.

Here are the best power banks for ultralight backpacking that we recommend:

A first visual impression of this power bank may have you thinking it does not pack much. However, it is the one thing you need to have your gadgets charged up during your weeks-long backpacking. Here are the reasons why we recommend it as the best solar charger power bank for lightweight backpacking:

### Water Resistant, Drop, and Shock-proof

Nothing compares to the heartache of having your power bank ruined by a few drops of water during backpacking. Oftentimes, people have had to pause their backpacking activity after water damage. The QuadraPro solar power bank is waterproof, so you can use it even when it’s raining. How cool!

Additionally, the manufacturers made this knowing that accidents are inevitable in the outdoors. You can drop this solar power bank and pick it up like nothing happened since it has panels protected with a thin sheet of sturdy plastic. Besides, its edges and the back have a grippy and tough silicon coating for a more secure grip.

### It is Compact yet Lightweight

This gem has come to your rescue if you still have to count the stars waiting for one gadget to charge before starting another. The QuadraPro solar power bank weighs only 13.1 ounces but charges up to 3 devices concurrently with the dual charging ports. Extra points for you if you have a wireless device since all you need to do is place it on top for the QuadraPro solar power bank to do its magic.

Owing to its incredibly lightweight and compact size, you can slide it into your side. purse, or glove compartment for an effortless backpacking experience.

### Convenient Charging

This bad boy also has built-in magnets you can attach to a metal object like your off-grid truck for convenient and safe charging. Its sturdy carabiner also lets you hook it on your back and get free power on the move. It is hands-down the best solar power bank for backpacking.

Besides this, you do not need to worry about it dying unexpectedly since placing it in the sun or plugging it in automatically reveals how much charge it has.

### Comes with a Big Backup Battery

The QuadraPro solar power bank packs pleasant surprises, including a 6500 mAh battery. Don’t get me wrong: the solar power bank in itself is a beast that can withstand multiple power refills to your gadgets. However, the backup battery lets you charge your batteries over three times when the sun is playing hide-and-seek or when you just completely forgot to put it out in the sun to charge.

### Comes with a Built-in LED Flashlight

How many of us are scared of the dark, especially on an unfamiliar trail? The QuadraPro solar power back proves to be the best backpacking solar power bank since it has a 50-lumen built-in flashlight. It becomes convenient when you need to light up a room, a campsite, or a trail.

## Power bank solar 50000mah

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Join the thousands of happy families, outdoor enthusiasts, and savings specialists who have harnessed the power of the sun with our Solar Power Bank. Experience the convenience and peace of mind offered by our Solar Power Bank, featuring a high-capacity battery that can charge multiple devices at once. This cutting-edge device ensures that you’ll never run out of battery life again, even during emergencies or power outages!

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We believe that everyone should have access to an eco-friendly power solution to charge their devices during emergencies or in off-grid situations. Our Solar Power Bank allows you to harness the sun’s energy to keep your devices charged while saving on electricity costs. With significantly lower than traditional solar panel systems, our Solar Power Bank provides exceptional value, making it the perfect choice for those seeking budget-friendly and environmentally friendly solutions.

### Portable Power for Emergencies and Off-Grid Adventures

Designed to be lightweight and compact, our Solar Power Bank is perfect for emergency preparedness, as well as outdoor activities like camping, hiking, and traveling. The high-capacity battery ensures that you’ll never run out of power when you need it most, providing an essential backup power source during emergencies or power outages. Its universal compatibility means you can charge any USB-chargeable device without any hassle.

### Features/Specs:

️ Efficient Solar Charging. Harness the power of the sun to charge your devices OR charge the power bank at the power socket

High-Capacity Battery. 50,000mAh battery can charge multiple devices at once.

⚡ Fast Charging. Quick charge compatible devices with efficient charging technology.

Compact Portable. 139mm x 75mm x 20mm and weighing ONLY 15.9 oz.

Water-Resistant. IPX4 rating ensures protection from splashes and light rain.

Connect Anything. It can charge almost anything with USB or USB-C connections! Perfect for anyone!

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