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100 Watt Solar Panel Equals How Many Amps?

Updated: July 21, 2023

100-Watt Solar Panel Equals How Many Amps

When it comes to using solar panels, it, unfortunately, isn’t as simple as hooking them straight up to your appliances and getting electricity from there.

It doesn’t help to wonder can a 100-watt solar panel run a refrigerator?” without knowing for sure if it can.

You need to know how much power your appliances will need, how many solar panels you will need as a result, and what technical words mean, and where they fit in.

Knowing how many amps come from a 100-watt solar panel will help you to find the answer to all these questions, and be properly prepared with enough electricity.

How Many Amps Are Produced By a 100 Watt Solar Panel?

A 100-watt solar panel can produce 100 watts of DC output in absolutely optimal conditions. 

Normally, a 100-watt solar panel produces approximately 18 volts of maximum power voltage. 

To calculate the amps, you would have to divide 100 watts by 18 volts, giving you a total of approximately 5.5 amps. 

It is important to take note that this output only occurs when there are optimal conditions present. 

For it to be classified as “optimal conditions” there must be maximum sunlight, no clouds or trees, and the solar panel must be set up at the right angle and direction.

Unfortunately, these conditions occur very seldomly, so very often the maximum amount of watts and amps that a 100-watt solar panel produces is different from the output that is often seen.

What Affects the Amount of Amps Produced By Solar Panels?

As mentioned, certain things may affect how many amps and watts are actually produced by 100-watt solar panels. These are discussed below.


100 watt solar panel how many amps

The weather has one of the biggest influences on how many amps a 100-watt solar panel will produce. 

A 100-watt solar panel output on a cloudy day is unfortunately very low. This means that way fewer amps will be produced compared to what would be on a sunny day.

In winter, there is also less sunlight than there is in summer, which will also affect how many watts and amps are produced.

Solar Panel Setup

100 watt solar panel equals how many amps

The position of the solar panel and the angle it’s tilted at may influence the amps produced. 

The solar panel should be positioned facing the sun at all times and should be slightly tilted for maximum efficiency.

Quality and Cleanliness

The quality and cleanliness of the solar panel may influence its efficiency and overall amps produced.

The solar panel should be of high quality and very clean for the best results.


Breakdown of the Terminology 

The main terminology you need to focus on is watts, volts, amps, and amp-hours.

Watts is a measure of power, and basically measures the solar panel’s performance and how much sunlight it converts into power.

Simply put, volts are a measure of the force of electricity generated by solar panels.

Amps are a measure of current and can be seen as the average amount of electricity used by appliances or devices.

Amp-hours refers to how many amps will be used in one hour and is a way to measure battery capacity.

Why Is It Important to Calculate Amps?

To put it simply, amps are the amount of power that a device will use to run, which is why it makes it so important to calculate how many your solar panels can produce.

Appliances often have the amps, amp-hours, watts, or volts specified on them, making it easy to always know or calculate how many amps they will draw. 

If an appliance or device states 12AH, this means that it requires 12 amps to run for an hour. So, if you are planning to run this device for 5 hours, you will need at least 60 amps to be produced so that it can run.

The reason that it is so important to know this is because it helps you calculate what size solar panels, and how many of them, you will need. 

It is important to get the amount and size of solar panels that you invest in almost spot-on for two reasons.

Firstly, if you invest in too few solar panels, it may leave you unprepared and sitting in the dark.

Secondly, batteries can only store so much power. So if you have too many solar panels, they might be making more electricity than what can be stored, which will end up being a massive waste. 

All in all, it is important to calculate amps to know the answer to questions like is 100-watt solar panel enough for an RV” or “can a 100-watt solar panel run an air conditioner” instead of just having to guess and hope.

Additionally, it will help you figure out what size inverter you need to convert DC to AC power, which is necessary to be able to use power outlets. 

Your inverter needs to be large enough, and by calculating the amps and volts, you’ll be able to figure out things like “will a 1000 watt inverter run a tv?”.

How to Calculate Amps 

In order to calculate the amps produced by a 100-watt solar panel, you will have to divide the watts of power by the maximum power voltage (Vmp) of the solar panel.

Final Thoughts

Although there is an estimated amount of amps that should be produced by 100-watt solar panels, it’s very difficult to say for sure what your actual output will be, and it may differ every day.

However, it is important to be able to calculate the number of amps you need to be properly prepared and not be left sitting in the dark. 

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Article by

Max Bair Marshall

Max is a co-founder of Shop Solar, a company that he established in 2018 to revolutionize the solar industry by simplifying the process and making it more simple and cost-effective. Under his strategic leadership, Shop Solar has grown into a comprehensive one-stop-shop, empowering over 40,000 customers to access top-quality solar and storage solutions, comprehensive information, intuitive tools, and professional installation services.

With a passion for innovation and sustainable energy, Max has successfully expanded the business's reach and impact, serving as a driving force in the company's growth and development. Today, as the leader of a dedicated team of 60+ professionals across North America, Max continues to set new standards of excellence in the renewable energy industry, with a mission to transform the way people access and utilize clean energy.

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