More and more lovers of outdoor activities prefer to spend vacations and weekends closer to pristine nature. But it’s difficult for a modern person to abandon the benefits of civilization - which of us does not take a mobile phone, laptop or camera on a trip?
But if there is a solar charger in your luggage, the problem with powering the devices will be solved. It remains only to figure out how to choose the right device. The article we have presented will be of great help in clarifying all issues.
What is solar charging?
These chargers are capable of converting solar energy into direct current. They can work with various models of navigators, players, laptops, telephones, cameras and other portable devices.
But the charging time directly depends on the power of the device itself and the type of discharged device, therefore, in order to choose a truly practical and versatile device, it’s worth understanding its characteristics.
Image Gallery
Photo from
The compact device that collects, accumulates, stores and transfers the charge received during the processing of solar energy will ensure independence from power sources
If a tourist’s equipment has a charger that uses sunlight to generate electricity, extreme situations are excluded
The small device, independent of the power supply network, will charge a mobile phone, laptop, tablet, portable media system without any problems
A solar-powered charger will charge mobile technology in minutes. It receives energy almost continuously
Mobile converter and solar battery
Travel Charger
Charging for continuous communication
Smartphone charging process
Instrument Design Features
The device itself consists of a crystal panel, a charge / discharge level controller and a converter of solar energy into electrical energy.
Some models are also equipped with a buffer battery of several lithium cells, which allows the device not only to convert, but also to accumulate energy to give a charge even in the dark.
Just a couple of years ago, solar chargers were quite expensive devices, and today it is a mass product with an affordable price.
Benefits of Solar Charges:
- Universal - adapted for various devices (USB connectors are provided on the case, and most models are additionally equipped with special adapters for various types of electrical equipment).
- They take up little space in travel luggage.
- There is a wide selection of shapes, colors, sizes and power for various needs and aesthetic taste.
Well, the most significant drawback for all solar exercises is the long time that they need to accumulate “power”. In addition, it should be understood that if almost any model can cope with the power supply of a mobile phone or camera, then an active “absorber” of energy such as a laptop will already require impressive power from a solar battery and a capacitive battery.
The principle of operation of the device
Solar-powered portable chargers are stand-alone systems that can process energy from both the rays and the mains, fluorescent lamps or a computer. Moreover, many models do not need the presence of intense sun - they accumulate a charge even on cloudy days, although the efficiency, of course, decreases (from 20 to 70%).
If you buy a device with the ability to connect to the mains, you can significantly save time on the accumulation of charge in cloudy weather
The device works like this: crystals on the panel absorb solar energy, its converter “processes” it into electric current, which enters the power source. When a mobile phone or other device is connected to this source using a cord, the accumulated energy gradually flows into the discharged device.
Types of Solar Charges
As for the appearance - here the manufacturers have tried not only to diversify the color gamut and the shape of the devices, but also to make the device as convenient as possible for use in various situations. Consider the most popular options.
Monoblock - a compact device made of a panel and a drive enclosed in a solid case made of metal or plastic. Such a device will “save” a dead phone on the beach or on a picnic and will not take up much space in an ordinary bag.
Monoblocks are convenient for everyday life - they do not take up much space and can be charged not only from the sun, but also while working on a laptop or computer
Flexible panel - Thin folding or expandable panel with photocells. It takes up little space in luggage, and weighs much less than its solid competitor, enclosed in a case. But, despite the decent area of "coverage", flexible plates accumulate solar charge almost twice as slow as monoblocks.
In addition, most panels work only from direct sunlight, without storing energy for future use - they do not have a built-in battery. However, you can always understaff your charging with an external drive of the required power.
So flexible panels are a good option for solving the problem of recharging low-power devices with "stationary" rest - in the country, fishing, with a tent. But for a hiking trip it is better to look at another option.
During movement, the flexible panel can be folded compactly and placed in the trunk or attached to the roof of the car, and on a halt - just spread out in the sun
Built-in charge - the device consists of solar panels that are attached to the outside of bags or travel backpacks. They allow you to recharge devices directly during the journey or to accumulate a charge in the built-in battery.
And such an accessory can be used for its intended purpose - to transfer any items or the same electronics, which is very convenient for those who are interested in hiking or working in the open air.
Although the “energy backpacks” look attractive and stylish, with the same success you can temporarily attach any other type of charge to the bag (many models are even equipped with special carabiners) and not worry about the safety of the device during rain or cleaning
Folding beds - it can be either several flexible panels compactly folded in a “stack”, or a variation of two monoblocks enclosed in a rigid case in the form of a drop-down book.
The main goal of such a device is to minimize the "capture" of usable space in the volume of your luggage and increase efficiency due to a larger number of photocells. A nice bonus - most models are equipped with mounts on a backpack or car glass.
The size of the “clamshell” can be selected based on your needs: to charge a mobile device, the size of the phone itself is enough, but for laptops and tablets the panel, even when folded, will be no less than sheet A5
But regardless of the design, all solar charges work on the same principle, so consider the important technical nuances that will help when buying a device.
How to choose a suitable option?
To begin with, it is worth deciding on the number and types of devices that you plan to charge from solar charging. The power of the device and the type of output port depend on these parameters.
If the device has several USB ports, you can connect and charge various devices at the same time, most importantly, to allow battery power
The characteristics of various devices can be clarified by looking at the instructions for their use, and in some devices the operating voltage is indicated on the charger, which is included in the kit, so it will be easy to navigate. In extreme cases, the desired adapter can always be purchased.
Key options and nice additions
From the characteristics of the charging current depends on the time that the device will need to recharge various devices. This indicator is measured in amperes and is indicated on the ports of the device.
Values:
- 1 ampere - designed for mobile phones, electronic cigarettes, watches, players.
- 2 amperes - suitable for tablets, smartphones, digital cameras and video cameras.
- 2.5-3 amperes - will cope with charging netbooks and laptops.
It is also important to know the output voltage, because rechargeable devices can exceed the capacity of solar charging in power. So, for most phones and simple tablets, a 5-volt output will be required, for digital cameras and gaming gadgets - 9, and for laptops and car refrigerators - 12-24.
But still, the main characteristic of the charger is the power of the solar panel. The battery charging time directly depends on this indicator. And here it all comes down to the characteristics of light-absorbing panels.
For example, elements with a power of 5 W (standard budget option) will have a current of 900 ma hours, and for 10 W - 1500 ma. That is, to charge the phone from solar charging at 5 W, it will take 2-3 hours, but a panel with a power of 10 W can do it for one and a half.
For powerful devices such as gaming tablets and laptops, it’s better to buy folding models from several panels that quickly generate a charge
In addition, devices with panels whose power does not exceed 2 W are used only to accumulate the charge of the built-in battery. And in order to directly charge devices from sunlight, you need panels with a power of 3 W or more.
Other important parameters:
- Battery availability - if the device does not have a drive, it can only work while it is in a lit place. Devices with batteries are capable of delivering a charge at any time of the day, as well as charging from other sources - a laptop’s USB port or an outlet with a 220V connection.
- Type of solar cells - it is believed that single crystals more efficiently absorb sunlight (their efficiency is 13-18%). In polycrystals, this indicator is lower - about 10-12%. You can distinguish them even with the naked eye - polycrystalline panels have a dark blue hue, and their competitors have black.
- Interface - Universal solar charging is equipped with informative USB, where you can choose the option you want, depending on the type of discharged device. Some devices are also equipped with an indicator of the intensity of sunlight, which will help determine the optimal location for a quick charge.
- Protection - a priori, all devices have a security system that allows their operation in nature. But for fans of extreme adventures it is worth looking for a device with enhanced protection from rain, dust, dirt, shock and other force majeure.
Additional features are most often represented by the "flashlight" or "lamp" function. This may be relevant not only for outdoor enthusiasts, but also for motorists - when replacing a wheel or repairing on a night road, a bright light will become an indispensable assistant.
Of the other bonuses, manufacturers can offer a USB hub or Wi-Fi hotspot. But, of course, any additions significantly increase the final cost of the product. And whether you need them is up to you.
In terms of shopping intensity, the following models lead us:
Image Gallery
Photo from
Anker 21W 2-Port USB Solar Charger
ALLPOWERS 28W Foldable Solar Panel Laptop Charger
General recommendations for operating the memory
Devices with a built-in battery must be fully charged before the first operation, and not from the sun, but from the mains. Then connect any device to the charger so that it receives energy and discharges the drive.
After that, the panel can be substituted under the rays and compensate for the lost charge. For models working directly from the sun, this rule does not work - they can be immediately installed on illuminated areas and connected devices.
Most solar chargers are designed to operate in temperatures ranging from -20 to + 45 degrees, but there are also special models that work in extreme climates, only they are made to order
To maximize the efficiency of solar charging, we recommend the following:
- Position the device so that the rays fall on the panel at a right angle. Even if the sun does not stand at its zenith, you can give the charging the correct position by lifting it at an angle of 40 degrees using some kind of backup. So you can collect a charge of 20-30% more than if you lay the panel horizontally in a bright place.
- Use the device with a drive, not only at halts, but also when traveling by car or on a camping trip. Such a tandem will be able to collect energy for 2-3 phone charges even in cloudy weather without direct sunlight.
- Keep in mind that in most folding devices, the panels are connected in series, so it is important that all elements are evenly lit. For example, even if the shadow covers only half of the first of the four panels, the battery power will drop by half.
- In order for high-capacity batteries to reach the declared parameters, they are recommended to be “dispersed” - completely discharge, then charge up to 100%. And so 3-4 times.
- For a long break (a month or more), store the memory at room temperature. If this is a device with a built-in battery, it must first be charged up to 50-70%.
And the last piece of advice - even if the charging has become worse working or completely out of order, do not disassemble it yourself so as not to damage the elements of the system and the case itself. The disassembled device is automatically removed from the warranty, so it is better to contact an authorized service center or the supplier.
How to make a charger yourself?
Although modern chargers have already ceased to be premium devices and are quite affordable for the average consumer, if you want to save money, there is always the opportunity to make such a device yourself.
An example of a homemade device in a rigid case made of a metal can equipped with a USB connector and an energy converter for charging low-power devices
To make a simple solar charger, you need to purchase several basic elements:
- poly or single crystal panel;
- holder for batteries;
- Schottky blocking diode;
- socket for connector;
- charge controller (however, if charging will produce 0.5-5V, you can use a cheaper 5V boost converter instead of the controller).
As for the panel itself, here you need to make a small calculation of the number of elements, based on the power of the device that you plan to charge.
For example, if the charge current for a battery is about 10% of its capacity, then a current of 2A is needed to charge 20,000 mA, and it will take about 14 hours to power the device. If you double the current to 4A, the time for recharging will be reduced to 7 hours.
Replacing the controller with a converter will allow you to collect the memory even with a low-power battery from a solar lawn lamp - anyway, we get the required 5V at the output (though it will take a long time to charge)
Depending on the current parameters for future charging (2 or 4A), crystalline elements are also selected. Usually, 1 part produces about 0.5V, that is, to get at least 5V you will need 10-12 elements.
Then they need to be sequentially soldered together.If the panel from the flashlight is used, then even the standard 70 * 70 cm can output from 2.5 to 4.5V, so it is better to check with a voltmeter.
The final stage is to enclose a home-made charge in any suitable frame (even a candy can is suitable) and equip with a USB connector. Then you need to solder the blocking diode to the connector, as well as the wires from the solar panel to the converter and holder according to the diagram below.
The Schottky diode is necessary so that when the device is turned on, the batteries should not be discharged through the solar battery. You can purchase it, like other components, on radio markets or on the Internet
It remains to check the operation of the device in the sun with any discharged device. If everything is in order, you can use the appropriate adapters and charge various devices.
Photo-instruction for independent masters
You can easily assemble a compact charger with a USB port to power your phone with your own hands. All components are available for sale, in extreme cases they can be written out. Homemade will cost tens of times cheaper than a factory-made product, especially if it is widely advertised.
Image Gallery
Photo from
All components for assembling a home-made charger that generates electricity when exposed to sunlight or an ordinary light bulb can be purchased at online and offline outlets
A home foreman will need a tool that is available to almost every host. It is necessary to stock up with a soldering iron, wire cutters, a drill, a stripper to remove insulation from the wires, an adhesive gun. It is advisable to invite an assistant
If you intend to recharge more serious and gluttonous devices than a smartphone, it is better to buy a lithium-ion battery and a controller for it
In the case of making a charge for servicing only a mobile phone, in a homemade circuit, you can use blocks of AA batteries of 2-4 pieces or a nickel-metal hydride battery
The work will require double-sided adhesive tape, solder, insulation tape, heat pipes to isolate the joints
The compact version of the solar panel can be purchased ready-made or build a home-made panel from series-connected mono- or polycrystalline photocells
All functional components of a portable charging system are placed in a rigid case. It will need to cut out the outputs for connecting rechargeable gadgets. Tin boxes are ideal for these purposes.
A standard USB port, designed for 5V, will be connected through a resistance-increasing circuit. So it is necessary to reduce the voltage at the input to the battery to 3.7V
Homemade Solar Charging
DIY Tools
Li-ion battery with controller
Battery Packs for Low Power Devices
Consumables and tools for him
Small solar panel
Tin box for making the case
USB port for connecting a charging object
When purchasing accessories for assembling the device, you need to consider that you need to buy a solar battery with a voltage of 5V or more. We already talked about the battery voltage, it is 3.7 V. However, we did not mention an important subtlety - “PCB protection” should be indicated in the marking or technical documentation of the battery. This means that it is protected from deep discharge and overcharge.
Two more connectors for 2.5 mm are required: one with a clamp on the panel, the second with a wire. You will also need a boost circuit on USB to supply DC power.
Stocked up with everything you need? Let's proceed to the assembly:
Image Gallery
Photo from
We are preparing to connect a compact solar battery on a polymer substrate: we clean the stripper with 0.8 insulation from wires
Slightly notching the insulation of the two-wire wire, we connect the core with a white strip to the minus, the second to the plus
Solder the conductors of the wire to the corresponding contacts. Protect solder joints with bitumen tape or glue from a gun
Having opened the tin box, which will serve as the body, we place the components of the future charge in it in order to decide how to better position them. After choosing a location, mark the holes on the outside of the case for the port exit and for connecting the solar battery
We drill holes in a tin box with a drill, securing it in a vice. For the USB port, we first drill two round holes, then connect them, and then grind with a dremel. To connect the battery - only one hole
To the controller, first we connect two stripped wires of the 2.5 mm connector. The model shown in the example has two more platforms for connection, they are needed for the battery
We apply rosin to the connection points and solder using wire solder. Then close the docking sections with shrink tubing
Fix the clamp diode 1N4001, the connector and the controller of the collected charge. Solder one wire to the negative pole of the connector, the second to the positive. We close the connection sections with heat shrink tubes
Step 1: Stripping the wire to connect the solar panel
Step 2: Connecting the Solar Panel
Step 3: Soldering Solar Connection Points
Step 4: Trying Charging Components to the Case
Step 5: Drilling Tin Box Holes
Step 6: Connecting the Connector Wires to the Controller
Step 7: Soldering the Connector and Controller Connections
Step 8: reassembling the functional part of the charge
In addition, you need to solder the diode. It is connected on one side by a wire to the battery, on the other - with the middle leg of the connector. It is advisable to make soldered joints as close as possible to the diode, all nodes must be protected by heat shrink tubes or at least glue drops.
Image Gallery
Photo from
Now we need to prepare for the next stage of soldering: fix the battery and the USB circuit for connecting the controller
To make the connection, first solder two short wires to the USB circuit: negative and positive. Then we connect these wires to the battery. We twist the stripped part of the wires together
After checking the accuracy of connecting negative and positive wires, we solder the nodes to the contacts located on the back of the battery
Before installing the assembled charger in the case, we check its performance. To do this, place the device in the sun and see if the battery is charging. In the absence of sun, it can be charged using a USB cable
Glue the inner surface of the tin box with bitumen tape to eliminate the possibility of a short circuit
First of all, we fix the connector inside the case, since this is the largest part of the assembled device
Having fixed the connector with bolts, we install the circuit and the battery in the case. We put the circuit on hot glue, fix the battery in small pieces of adhesive tape
We check the result of our work by trying to charge the mobile phone. If everything is normal, proceed to the operation of homemade
Step 9: Preparing the Battery and Boost Circuit
Step 10: Connect the battery and USB circuit
Step 11: Weld Fasteners
Step 12: Testing the health of a device without a case
Step 13: Installing Waterproofing
Step 14: Locating Components in the Case
Step 15: Install the circuit and battery into the chassis
Step 16: Finishing the Charger
The following article on this interesting issue will familiarize you with the rules for selecting solar panels for arranging a private house or cottage.
To get a visual idea of solar chargers and the principles of their work, we offer to see our selection of videos:
Practical tips and tricks on how to choose charging for various devices. You can look inside and study the monoblock scheme with the author of this video:
How to assemble a charger that works on sunlight do-it-yourself:
Thanks to the technological progress and the bright minds of the inventors who made available the energy of the sun for ordinary users. Thanks to such chargers, you can not worry about the fact that on vacation at the right time you will be left without any connection with civilization.
Well, and if there are difficulties with the selection of a device, you can always turn for advice to professionals who are knowledgeable in electrics.
Tell us about how you used solar charging in camping conditions, on a picnic or on the road. Please write comments in the block below. Ask questions, share impressions and useful information on the topic, publish photos.