best solar powered calculator

Best Solar Desk Calculators Review & Buying Guide

It is very important to choose the best solar powered calculators for your needs.

Solar power has many benefits, but it’s not always an option for you.

That’s why we’re here to help! We’ve reviewed and ranked the top 5 solar powered calculators based on their features and functionality, so that you can find one that suits your needs. 

1. Helect Standard Function Solar Desk Calculator

Helect Calculator, Standard Function Desktop solar Calculator, Black

The first item on today’s list of the best solar powered calculators is the Helect Standard Function Calculator.

One of the things that I really like about this calculator is its compact size. It’s only 4.8 x 5.75 x 2.01 inches, which makes it a perfect fit for small desks with limited space.

Further, this calculator can do more than just basic math, it can do taxes, convert currencies, calculate profit margin, and many more. This solar calculator really has it all.

The buttons are very nice to press, and look good.

For the display, this calculator comes equipped with a 12-digit display and very nice to press buttons, which make it much easier to work with numbers.

With this calculator, you will never have to worry about running out of charge. This is because the Helect standard calculator features a high quality solar panel that will use sunlight and convert it to electricity to keep your batteries topped up all year long.

What we like

  • Good Value for a basic four function desk calculator
  • No glare from the overhead lights
  • Big and responsive buttons
  • Big display and the buttons are easy to press
  • High quality solar panel

 2. Casio MS-80B Standard Function Solar Powered Calculator

Casio MS-80B Standard Function Desktop Calculator,Black

The Casio MS-80B calculator is ideal for the modern businessman or woman who needs to do complex calculations fairly quickly. 

From a quality perspective, it can easily outperform some of the high-end financial calculators in the market and it fits very well in a drawer or briefcase.

Buttons work flawlessly without sticking or not registering at all.

It has a large 8 digit, anti-glare display making the numbers very easy to read even in the brightest rooms.

Additionally, this calculator includes profit margin percentage, memory keys, and +/- key rollover, as well as tax and currency conversion, basic functions, and command signs.

In terms of power, the Casio MS-80B can be powered by a battery or the solar panel.

What we like

  • It can comfortably replace many pricer calculators
  • User friendly interface
  • Extremely portable and compact
  • Very clear antiglare display
  • Dual powered

3. Sharp Electronics 8-Digit Twin Powered Calculator

Sharp Electronics 8-Digit Twin Powered Calculator (EL-243S/EL-243SB)

Sharp is really conquering the market with their digital pocket calculator.

This calculator is the right choice for your everyday math needs and it’s 4.25 x 2.5 x 0.7 inches making it very handy to take it everywhere.

It automatically switches from solar to battery power in low light conditions so you will never run out of power guaranteeing uninterrupted functioning and a consistently bright, clear display.

The Sharp solar calculator is designed with an extra-large LCD display so you can easily see all of your calculations and an attached hardcover which It’s made of great plastic components to save it from breaking.

Moreover, it contains 3-key memory including memory plus, memory minus, recall/clear memory keys, percent, square root keys, and sign change keys.

What we like

  • Very small in size, making it perfect to carry on the go in a purse or even pocket.
  • Easy to press keys and can to years for the numbers to wear off
  • Automatically change the power source from solar to battery
  • Comes with a hard cover to protect the calculator from falling damage

4. EastPin Basic Solar Power Calculator

Calculator,12-Digit Solar Battery Basic Calculator,Solar Battery Dual Power with Large LCD Display Office Calculators(Black002) (Black002)

This is a great calculator for anyone who needs to do the math on the fly. 

The desktop calculator is solar-powered and has a 1 AA backup battery, allowing it to work in low-light conditions.

The calculator’s 12 digit display provides maximum viewing, making it ideal for large calculations providing maximum viewing.

Eastpin calculators employ a scientific button design that is in line with human behaviors and is comfortable to touch.

It’s not as compact as other calculators, but it has lots of features and definitely worth buying – in my opinion.

What we like

  • One year replacement and refund
  • Durable ABS plastic buttons
  • Easy-to-read numbers for maximum viewing comfort.
  • Has a battery backup in case of low lighting environment

5. Casio Basic Solar Folding Calculator

Casio SL-100L Basic Solar Folding Compact Calculator

Casio crushes the market with its neat folding design calculator that protects buttons and the display from scratches.

The design of this calculator is compact enough to fit in your pocket or purse so it’s always available when you need it.

It can perform the four basic operations as well as percent and square root.

The Casio Basic Folding Compact Solar Powered Calculator also has its own memory for storing numbers for later retrieval.

The buttons are big enough that you never have trouble hitting them with your fingertips or accidentally pressing two of them at once when trying to press one button.

It’s dual powered by solar and a 1 CR2 battery.

What we like

  • Nice spacing between buttons
  • High quality material
  • Extremely portable
  • Stylish design

How Do Solar Calculators Work?

There are many companies that make solar calculators, which means how they work can vary. Generally though, you will find a few commonalities between them all.

First of all let’s talk about how they turn sunlight into energy. These calculators use photovoltaic cells to capture the suns rays and converts it  into an electric current. This electric current can then be used to power the calculator and charge its battery simultaneously.

These calculators may not work as quickly during overcast days or indoors, but they will still collect energy from any light source that it can find! Don’t worry about how long you need to wait until it charges either; It only takes an hour or two to go from 0% to 100%.

How To Charge Solar Powered Calculators?

You can charge solar powered calculators by leaving them out on a sunny day, or any light source for that matter; It will collect energy throughout the day and night!

How Long Does It Take For Solar Calculators To Charge?

Since they use a photovoltaic cell to capture sunlight, how long it takes for solar calculators to charge varies. It often depends on how strong the sun’s rays are at that time of day and how powerful your calculator is.

For example, if you have an older model with less power or a weaker charging system, you might need to charge it for a few hours. On the other hand, if you have one of the latest models with more power and better technology, it might only take 30 minutes to get a full battery!

Do Solar Powered Calculators Work With Artificial Light?

Yes, solar powered calculators will work with any light source. They capture the suns rays during the day and artificial lights at night to keep their batteries charged up throughout the year!

If you use your calculator indoors or under a cloud-covered sky, how long it takes for these units to charge will depend on how strong the light source is.

If you use them under fluorescent lights, for example, it may take several hours to get a full battery; On the other hand if you leave it in front of a window with natural sunlight pouring through (which happens every day) then expect your solar powered calculator to be fully charged by the time you get home!

How do I Know if My Solar Powered Calculator has Enough Charged?

If your solar powered calculator is not working, how will you know if it needs to be charged or just hasn’t been used in a while?

That’s an easy one; when the power button doesn’t work then that means there isn’t enough battery power to turn it on.

When this happens, just leave your calculator in sunlight for a few hours and try again. If the light button still doesn’t work then how about charging it overnight? On average these calculators take anywhere from 30 minutes to several hours (depending upon how much energy is needed) so plan accordingly!

How Much Power Do Solar Powered Calculators Need?

Now that you know how they work, how much power do solar powered calculators need to operate efficiently?

The good news is it takes virtually no energy at all! On average these calculators require just .02-.03 watts of electricity to operate, which is about how much it takes to power a night light.

There’s no need to worry about how much power it needs though because they will charge up as you use them and the sun beats down on them throughout the day too!

Just leave your calculator out in a sunny spot for an entire day and watch how much battery life it gets.

How Long Do They Last On One Charge?  

You’ll be pleasantly surprised with how long these calculators can stay powered up for! Just like their name says, you only need sunlight (or any other form of light) to keep them running all day long. If you use them only in the day time, expect that they will last for a full year on a single charge!

How to Choose the Best Solar Powered Calculator?

Now that you know how these calculators work and how long their battery lasts, let’s talk about how much power it takes. You should choose one based upon your needs, how often you will use it, and how long your work day is.

If you spend a lot of time in the sun or plan to use this calculator all throughout the year (to save money on batteries) then we recommend choosing one that requires very little power; .02-.03 watts should be sufficient for any solar powered calculator. If you don’t plan to use it a lot, then you can choose how ever much power you need – just know that the more powerful your calculator is, the faster its battery will drain.

Finally, we recommend choosing one with as large of a solar panel as possible so you’ll have plenty of surface area for sunlight exposure! If there is not enough sunlight to charge it, then how can you expect this calculator to work?

Last Words

If you are interested in how solar powered calculators work and want the best one for your needs, follow these steps.

First determine how much power you need (based upon how often you will use it). Then choose a powerful enough battery so that it doesn’t drain too quickly.

Finally, choose a calculator with as large of a solar panel as possible so you’ll have plenty of surface area for sunlight exposure!

If you follow these steps and do your research thoroughly, how to choose the best solar powered calculator will be easy peasy!

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