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Solar Chargers Produce electricity according to size. The bigger the panel the more power it produces. This however is pegged on efficiency and that’s the general rule. Portable Solar Panels range from the Smallest 5 watt to the highest which can go up to 200 watts. This also dictates the price and would range from $20 to $500, depending upon the brand and additional features.
The wattage of the panels are indicated and this can guide you in choosing for the best use such as heavy duty or light, mobile ,and either single outlet or multiple outlets. A phone needs 3watts to 5watts of power to charge while an iPad would need around 11 watts.
However if you pick the 5 watts charger for your phone it may not be dependable as this will drop drastically due to inefficiency and wont fully charge your cellphone on cloudy days.
Solar chargers are tested at STC (Standard Test Conditions) at a humidity of around 1.5 and ambient temperature 25 degrees Celsius and are flashed with 100 watt of light. These tests provide a theoretical maximum rating that will not simply work in real world conditions.
To get the wattage of a Solar Panel you simply multiply the Rated Amperage with the Voltage (This may be accurate in some instances)
Example 3A x 5V = 15 Watts
A solar charger is easy to use and you have just to leave the charger around in the sun to charge. Dispersed light is better for solar panels than direct sunlight or sunlight at an angle and a panel can exceed 30% efficiency with dispersed light. Solar Panels can be used to charge all types of Rechargeable Batteries regardless of Voltage.
But when selecting a Solar Panel it is important that you match up Wattage and Voltage in order to get the best results.
Features of a Good Portable Solar Charger
A foldable solar panels that encloses neatly with Velcro tape to ensure ensure everything keeps together and can be easily carried or placed in a backpack.
This allows you to put your phone or power bank to avoid it heating up in direct sunlight.
USB ports and 18V output
USB ports for fast charging your phone and 18V output that you can connect to your laptop.
Hooks or Metal Eyes for Hanging
Preferably metal eyes that cannot be torn over time. This will ensure you can hang the solar charger where there is sufficient light.
A waterproof Solar Charger that will not spoil when exposed to the elements of the outdoors.
A MPPT Charge Controller ensures that it doesn’t overcharge the device. Some have a dc to dc converter but avoid ones with just a voltage regulator because it just throws away power.
This ensures that the rate of charging doesn’t go up or down drastically.
Price Per Watt
An efficient solar panel ensures you get your money’s worth.
Car Battery charger
Solar Chargers can be used to charge batteries or to keep them maintained. Charging for any device starts after the charger is exposed to the sun. It is capable to store some energy when not exposed. Some applications can use low light technology on a cloudy day. The charger cables are easy to install and resist humidity and dust with its double insulation. With low voltage compared to electricity solar chargers wont overcharge your Car or RV Battery.
SUNER POWER 12V 5 Watts Solar Battery Charger & Maintainer
Small size allows it to be used on the go.
Charge Controller for overcharge protection
Blocking Diode to prevent reverse charging
Suction cups to allow for mounting on Cars Windscreen
Not for Charging Battery just maintaining charge
Simple Solar Chargers can supply constant voltage or current to the battery being charged without altering its output based on time or the charge on the battery. Another solar charger fit for an all-day use is a trickle charger that is simple in terms of power consumption. This charger charges a battery slowly so you can leave it for prolonged hours without spoiling it compared to other battery chargers.
Your battery will remain powered but never over charged even if it stays on the battery charger indefinitely. To prolong battery life, most manufacturers recommend using the right Solar Charger for your electronic device battery. Limiting the depth of discharge to about twenty percent and not allowing batteries to be discharged below fifty percent depth of discharge (DOD) also prolong battery life.
Timers or alarms can provide warnings when you need to disconnect your charger from the batteries. You can also preserve your batteries by using an inverter of a low voltage with a disconnect feature that will disconnect at given set points.
A solar powered cell phone charger is a charging system for your phone that operates off of solar energy. This type of cell phone charger is easy to use and is portable, so it is great for people who like to travel a lot. There are two types: Direct Charger and the Power bank Charger
To use the direct solar charger you just face the panels and simply place into your cell phone. It is simple and fast. You can bring your charger will you on hikes or even walking about a theme park.
Nekteck 21W Portable Solar Panel Charger,
Small, Foldable and Portable
Easily Attachable to a Backpack or Tents
Multiple Ports; USB and Micro USB
Works best in Direct Sunlight
Does not store power
With a solar charger you can be sure to have power available to your cell phone whenever you need it. It does not matter how far away from the city and electricity you get. If you own a solar charger you will be able to power your cell phone at all times. Phones usually come with inbuilt charge controllers so it is safe to use directly.
Solar Power Bank Charger
A power bank is really useful as these are backups for your phones . They help you charge your phone any time and are portable. The added advantage of a Solar Bank Charger is that it can be easily recharge with solar energy.
Yelomin 20000mAh Solar Charger Mobile Power Bank
Portable Small, compact, and lightweight.
Nice silicon case protects from rain, dirt and shock and offers firm.
2 LED flashlights with moderate brightness.
Solar charging (only as backup make sure to fully charge with USB before leaving for the outdoors)
Takes a long time to charge with solar power.
Before you decide the power bank or solar power bank for mobile, you first consider the battery capacity of your phone. If you want to have an idea let us give you some common mobile phones battery capacity , in general you should purchase a solar power bank that is at-least 2.5 X capacity of your phones battery , however the more capacity of power banks lets you charge your phone multiple times at one go.
The handy solar laptop chargers come in different sizes, weights and shapes and even with their cost. This might cost you, but simply think about the help that it could provide for you such as the free energy and the long period of employment.
Furthermore, the usage of this charger is not for laptop alone, it can also be use to charge electronic devices like the mobile, GPS systems, iPods, camcorders, PDAs and even to jump start an automobile during emergencies.
ALLPOWERS 60W Monocrystalline Foldable Solar Charger
Easy to set up
Fast Charging ensure that you save time
Built in Voltage Regulator to protect your device
Power up to 2 devices
Foldable hence portable
Dual USB + DC Output
Needs direct sunlight to produce meaning full charge for a laptop battery otherwise you can use for phone
Using this kind of charger is considered as handy due to it has less wiring and cabling. There are two types of solar battery available in the market. Both of these compact and user friendly but the selection will depend on your preference as well as your budget.
There is a kind of solar laptop charger that you can also fold and there are ones which is a hard case type and bring it safely. With this kind of solar panel charger, you only need to click the shut button if you are not going to use it. This will surely eliminate the chances of damaging the solar panel itself.
Solar Backpack Charger
A portable charger is a very useful addition to a backpacker’s gear set. When backpacking, weight is at a premium, and few things offer more concentrated weight than batteries. Despite that seemingly obvious fact, backpackers have come to rely on battery operated devices for everything from telling direction to providing music during the trip.
Anker 21W Solar Charger with Foldable Panel
Small, Foldable and Portable
Easily Attachable to a Backpack or Tents
Multiple Ports; USB and Micro USB
Works best in Direct Sunlight
The range of use for electronic devices runs the gauntlet from life saving necessity to pleasant diversion. It’s one thing if your MP3 player goes dead while backpacking. It’s quite another thing entirely if your GPS unit goes dead, or even worse, a back country beacon. The backpack charger weighs very little, can be rolled up to take less pack space than a sleeping pad, and ensures that you don’t run the risk of having vital equipment die in the middle of your trip.
The combination to look for is a voltage higher than that of the device you need to charge and of course, the lowest weight possible. The size of the panel when spread out is typically between one and six square feet, but the packed volume is more important to consider when you are purchasing.
High Capacity Solar Battery Charger
Typically, a high capacity solar charger battery can recharge anything from 5V products such as an Ipad or cell phone, to almost any 12v Battery. With an incredible array of adapters that comes with it, you will never have to worry about which product you plug in, because you all would need to do is simply select the current for your product, attach the correct adapter, and let it charge.
Renogy 100 Watt 12 Volt Monocrystalline Off Grid
Pulse Width Modulation (PWM) technology for battery charging.
Solar Charge controller to prevent overcharging.
Negative ground controller
Requires some maintenance
This is a great device for anyone who enjoys spending time outdoors as well as at home. Major differences between a high capacity solar charger battery and a regular one is that the former features overcharge, discharge, short circuit, and heat protection.
If you are looking to solar charge an RV or cabin, this is what you want to start with. This package should include a solar panel, Charge Controller, mounting brackets, an adaptor kit and tray cables. This panel can charge a 50Ah Battery from 50% in 3 hours in direct sunlight. Used to charge deep cycle SLA, Gel or flooded batteries.
How a Solar Charger Works
The Solar charger is made up of small solar panels. The solar panel uses solar cells which are made up of monocrystalline silicon water that converts sunlight into electricity through photovoltaic effect. The monocrystalline silicon water is said to give the best result.
The ray from the sun which contains photons is absorbed the monocrystalline silicon water which heats up causing negatively charger electron to move in the material and create electricity. This electricity is then transferred to the device that is hooked up to the Solar battery charger and in turn charges the device.
Solar battery charger often comes with PV system controllers. The PV system controller regulates power to the device or battery attached to the charger and makes sure that they are not damaged by cutting or increasing the power to maintain a controlled and constant flow.
Types of Solar Chargers by Technology
1. Mono-crystalline Solar Panels
In these types of panels, crystalline silicon is used for making large sheets that can be cut to create the panels. Thus, a single and large-sized cell creates all the panels. Metallic strips are then laid on the cell and it acts as the conductor for capturing the freely moving electrons. The unique thing about mono-crystalline Solar Energy Panels is that they have higher efficiency compared to the second type of panels, poly-crystalline panels. However, they are still cheaper than the later.
2. Poly-crystalline Solar Panels
In this type of solar panels, a group of smaller solar cells are added together to create a large cell. These panels have lesser efficiency compared to the mono-crystalline alternatives. The strange thing about this technology is that even though it costs less to the manufacturer compared to the mono-crystalline panels, these Solar Energy Panels cost more to the end customer.
3. Thin Film Solar Panels
The production of thin film Solar Energy Panels is entirely different from that of the crystalline solar panels. In this case, the silicon is used without its crystalline structure. Rather, it is applied on a surface as a thin film. And, even alternatives of silicon like Copper Indium Diselenide (CIS) or Cadmium Telluride are used as semiconductors.
The coated material is then connected to the metal strips as in the case of the crystalline cells. However, the typical components found in the crystalline panels are not used because in this case, there is no need for that level of protection.
Thin Film Vs Mono Crystalline Solar Chargers
The most common types of Solar Panels you will find in the market are the thin film and the Mono Crystalline types. Thin film solar panels have better efficiency, occupy less space and weigh less. Thin film panels also perform better at high temperatures and can maintain efficiency when its hot.
Monocrystalline solar panels have a small advantage in colder conditions and shady conditions. They also maintain Efficiency overtime while Thin Film Panels tend to decline over time.
What are the benefits of Solar Battery Chargers?
There are 3 major benefits which solar battery chargers can give us:
They do not require external electrical sources to recharge your batteries.
This gives the huge benefit of being able to recharge your batteries without being near a power source. Anywhere there is sunshine you can recharge. Let’s take an extreme case of driving through the woods and your car breaks down your mobile battery is dead and you’re stranded.
A solar battery charger will give you peace of mind knowing you can charge your phone and make the call. This point is especially relevant to hikers & and some extreme sports.
Once you have bought your charger there is no ongoing cost to recharge. In fact I know of a family which no longer charge their mobiles from a power point. What a saving. The other cost factor is that with developments in technology the cost of solar battery chargers has reduced dramatically.
The environmental benefit.
Solar cells generate no emissions. Most energy is produced around the world by burning coal in big power stations. We all know the negative effect this is having on our environment.
Glossary of Terms
Solar terminology can be confusing at times, that’s why I’m giving you the following short list, if you’re stuck wondering what a certain term means, use it:
The voltage at which a charge controller will take action to protect the batteries.
Alternating current (AC)
Electrical current the direction of which is reversed at regular intervals or cycles. In the United States, the standard is 120 reversals or 60 cycles per second.
A unit of electrical current or rate of flow of electrons. One volt across one ohm of resistance causes a current flow of one ampere.
A measure of the flow of current (in amperes) over one hour; used to measure battery capacity.
Angle of incidence
The angle that a ray of sun makes with a line perpendicular to the surface. For example, a surface that directly faces the sun has a solar angle of incidence of zero, but if the surface is parallel to the sun (for example, sunrise striking a horizontal rooftop), the angle of incidence is 90°.
The electrical current produced by a photovoltaic array when it is exposed to sunlight.
Array operating voltage
The voltage produced by a photovoltaic array when exposed to sunlight and connected to a load.
Battery cycle life
The number of cycles, to a specified depth of discharge, that a cell or battery can undergo before failing to meet its specified capacity or efficiency performance criteria.
A solid-state component installed between the solar module and the battery. It prevents the solar panel from discharging the battery in the absence of sunlight. It can be thought of as a one-way valve that allows electrons to flow forwards, but not backwards.
Bimodal PV (photovoltaic) system
A PV system that can call upon stored power from its own battery or, when needed, from an electric grid (utility).
A diode connected across one or more solar cells in a photovoltaic module so that the diode will conduct if the cells become reverse-biased. It protects these solar cells from thermal destruction in total or partial shading of individual solar cells while other cells are exposed to full light.
A device that regulates battery charge by controlling the charging voltage and/or current from a direct-current (DC) power source, such as a PV array.
The increase in solar intensity caused by reflected irradiance from nearby clouds.
A photovoltaic module that includes optical components such as lenses to direct and concentrate sunlight onto a solar cell of smaller area. Most concentrator arrays must directly face or track the sun. They can increase the power flux of sunlight hundreds of times.
The ratio of the electric power produced by a PV device to the power of the sunlight shining on the device. Cell efficiency defines how much energy in sunlight is actually converted into electricity.
Days of storage
The number of consecutive days the stand-alone system will meet a defined load without solar energy input. This term is related to system availability.
Direct-coupled PV system
A system in which the output of a PV module or array is directly connected to a DC load (a device that uses DC power).
Direct current (DC)
Electrical current that flows in one direction through the conductor. To be used for typical 120 volt or 220 volt household appliances, DC must be converted to alternating current.
A system in which many smaller power-generating systems create electrical power near the point of consumption.
A chemical element (impurity) added in small amounts to an otherwise pure semiconductor material to modify the electrical properties of the material. An n-dopant introduces more electrons. A p-dopant creates electron vacancies (holes).
Time when the photovoltaic system cannot provide power for the load. Usually expressed in hours per year or that percentage.
The flow of electrical energy (electricity) in a conductor, measured in amperes.
An electrochemical device that channels an electric current through water to break down water molecules and extract their components, hydrogen and oxygen.
Fixed tilt array
A photovoltaic array set in at a fixed angle with respect to horizontal.
A PV array that consists of non-concentrating PV modules.
A solar energy collector that absorbs solar energy on a flat surface, without concentrating it, and can utilize solar radiation directly from the sun as well as radiation that is reflected or scattered by clouds and other surfaces.
An electrochemical device that uses hydrogen and oxygen to produce DC electricity, with water and heat as byproducts.
The amount of power density in sunlight received at the earth’s surface at noon on a clear day (about 1,000 watts/square meter).
A device that converts mechanical energy into electricity by means of electromagnetic induction. (A shaft bearing permanent magnets is turned, and the changing magnetic field creates an electrical current in a surrounding wire coil.)
The vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.
A system that includes an energy source other than a solar array and (if interactive) the utility. Examples include wind and diesel power.
A business that designs, builds, and installs complete PV systems for particular applications by matching components from various manufacturers.
A device that converts DC power from battery systems or arrays to utility-grade alternating current (AC) power for AC loads or export to the utility grid.
A metric unit of energy or work; 1 joule per second equals 1 watt or 0.737 foot-pounds; 1 Btu equals 1,055 joules.
A standard unit of electrical power equal to 1000 watts, or to the energy consumption at a rate of 1000 joules per second.
1,000 thousand watts acting over a period of 1 hour. The kWh is a unit of energy. 1 kWh=3600 kJ.
Maximum power point (MPP)
The point on the current-voltage (I-V) curve of a module under illumination, where the product of current and voltage is maximum. For a typical silicon cell, this is at about 0.45 volts.
The smallest semiconductor element that converts sunlight into electricity. Each cell is made of silicon or another semiconductive material, like a computer chip. The silicon is treated so that it generates a flow of electricity when light shines on it.
A device that converts AC power to DC power.
The property of a conductor that opposes the flow of an electric current resulting in the generation of heat in the conducting material. The resistance is specified in ohms.
Solar modules, or panels, are series of solar cells wired together into strings and enclosed in self-contained glass units for weather protection.
Self-regulating PV system
A type of stand-alone system that uses no active control systems to protect the battery, except through careful design and component sizing.
Any material that has a limited capacity for conducting an electric current. Certain semiconductors, including silicon, gallium arsenide, copper indium diselenide, and cadmium telluride, are uniquely suited to the photovoltaic conversion process.
A semi-metallic chemical element that makes an excellent semiconductor material for photovoltaic devices. It crystallizes in face-centered cubic lattice, like a diamond. It’s commonly found as the oxide in sand and quartz.
Stand-alone PV system
A type of PV system that operates autonomously and supplies power to electrical loads independently of the electric utility.
The angle at which a photovoltaic array is set to face the sun relative to a horizontal position. The tilt angle can be set or adjusted to maximize seasonal or annual energy collection.
A unit of electrical force equal to that amount of electromotive force that will cause a steady current of one ampere to flow through a resistance of one ohm.
The rate of energy transfer equivalent to one ampere under an electrical pressure of one volt. One watt equals 1/746 horsepower, or one joule per second. It is the product of voltage and current (amperage).
The angle between the direction of interest (of the sun, for example) and the zenith (directly overhead).