How Many Amps Does a 25-Watt Solar Panel Produce?

How Many Amps Does a 25-Watt Solar Panel Produce?

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Electrical energy is an essential part of present-day life, and it can sometimes be very hard to imagine our lives without basic electronic gadgets. Thanks to solar energy technology, you can now charge batteries for some of your basic appliances simply by utilizing the readily available sunlight outdoors. You will learn in this article how many amps a 25-watt solar panel can produce as well as how long it will take to charge a battery using a 25-watt solar panel.

With a voltage of 17 Volts (with load), a 25-watt solar panel can provide 1.5 amps. This current can be used to charge batteries, camera power cells, or even your mobile phone. You can run multiple LED lights as well as DC-power table fans on one of these panels while camping or just while at home. A 25-watt solar panel is the best power solution to take with you during a camping trip or out on a picnic due to its small size and how easy it is to handle and carry.

Let’s go over a brief overview about how many batteries you can charge with a 25-watt panel and how much current it can provide to be useful during sun hours.

How Much Energy a 25-Watt Solar Panel Generates

25-watt solar panels fall into the category of small, handheld, or backpack-type solar panels. On clear days with normal irradiance (1000 W/m2), it can provide around 22 volts open circuit with a 36-cell panel. The operating voltage of a 25-watt solar panel is 17 volts. We also know that a solar cell has an almost equal short circuit current and operating current; so, in this panel, those are 1.5 and 1.4, respectively.

Therefore, over the course of an entire day, this type of panel can provide energy equal to 125Wh (assuming 5.5 hours of sunshine). This ampere rating is more than enough to run pocket and handheld daily-use appliances and a variety of electronic gadgets. One can easily be able to constantly run a DC fan, charge their mobile phone, charge a power bank, charge camera batteries, run an LED bulb, or charge up flashlight batteries.

Battery Charging Using a 25-Watt Solar Panel

As mentioned, a 25-watt solar panel provides 1.4 amps. This means you can charge nearly every type of battery by using a 25-watt solar panel.

Charging Lead Acid Batteries

If we consider a lead-acid battery that can be charged at a rate of C/10 (10% of total capacity), we can charge 15Ah of a lead-acid battery with a 25-watt solar panel and, of course, a charge controller in-between. In just one whole day, a 25-watt solar panel can charge this type of battery and it can then be used as backup for you to run LED lights at night. This type of battery can typically run 3 LED lights (7W each) for 9 hours.  To get the most out of your lights and rechargeable lead-acid batteries, you can buy a complete package including a solar panel as well as a charge controller, too, to keep things going.

Charging Dry Batteries

Dry batteries can also be charged with a 25-watt solar panel, these often being the batteries used in gadgets necessary to bring along during a camping trip or on another similar type of journey or adventure: your camera, mobile phone, a drone camera, flashlight, laptop, tablet, and a radio. These items all have batteries, either Lithium-ion, Ni-Cd, or NiMH batteries. These batteries have a capacity that can easily be charged with a 25-watt solar panel.

As an example, if a battery has a 40Wh capacity at 14.8 volts, this means it has a current rating of around 2Ah. By using a 25-watt solar panel, you can easily charge batteries of this capacity without any trouble.

Charging Rechargeable Batteries

With rechargeable batteries, the charge current can be higher and even up to 1C (current equal to capacity). In those cases, small batteries that are used in a variety of appliances, such as for a digital camera, can easily be charged with a 25-watt solar panel. These cells can be charged within about one hour to their full capacity, too.

These batteries have a capacity of around 1.5Ah each with a voltage of 1.2 volts, so you can actually charge eight individual batteries at the same time with just one 25-watt solar panel. You can charge a variety of different batteries for use in different gadgets, so mixing and matching during the charging process is nothing to worry about.

Charging a Mobile Phone

An essential component of our daily lives is charging our mobile phones. You can easily charge your mobile phone by using a handheld, small-size 25-watt solar panel. A typical mobile charger needs 1.5-2 amps of current to charge. As noted, this type of solar panel can provide you with a constant current during the day at 17 volts, so you can charge multiple phones at the same on this solar panel if needed.

Lighting Using 25-Watt Solar Panel

The average LED light bulb used in one’s house consumes about 7 watts at 12 volts, meaning that it takes around 0.6 amps of current on the DC side. So, during the day when the sun is shining bright, you can run three 7-watt LED lights on a 25-watt solar panel, which should provide plenty of light to brighten an entire room.

Powering a DC Fan

There are DC table fans and camping fans that require only about 10-15 watts of power to run. These fans provide enough air and ventilation to keep a tent with 3 to 4 persons comfortably cool. As a huge bonus, these fans can be run with no problem on 25-watt solar panels during those hot summer days. Additionally, the batteries used in such fans can also be charged through one of these solar panels so they can be used at night when the sun is not around to keep the power going strictly through solar means.

Final Words

A 25-watt solar panel provides around 1.5 amperes of current. This current is enough to run many basic components required and utilized in daily modern life. A panel like this can be used to charge mobile phones, charge rechargeable batteries, flashlight cells/batteries, and power DC fans and LED lights. These panels are also smaller in size and can be used like handheld devices—this is why they are best suited for campers and people out on picnics or other outdoor excursions. They only cover a very small area and can easily charge cameras, mobile phones, and radios.

A 25-watt solar panel can run three 7-watt LED bulbs, which is enough to properly light a single room without having to impact your power bill. Similarly, a table DC fan or exhaust fan for a tent or a bed can be run continuously on solar panel, making your outdoor fun much more comfortable and easy.

See Also:
Goal Zero Yeti 1250 Portable Power Station Review
What Size Charge Controller Works for a 200W Solar Panel
Running Cold: Can a 100W Solar Panel Run a Refrigerator?

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