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Watt Calculator

Short on Time? Here’s The Article Summary

The article provides a guide on how to calculate the wattage of a solar power setup, emphasizing the importance of knowing the system's capabilities to avoid overuse. It explains Watt's Law, which uses the equation P = VI (power equals voltage multiplied by current) to calculate wattage. The voltage of solar panels is typically between 12 and 24V, and the current can be measured using a multimeter, usually ranging from 6 to 7.5 amps per panel.

An example calculation is provided, demonstrating how to calculate wattage based on voltage and current. Additionally, the article offers tools and guides for converting watts to other units and calculating solar load, and encourages readers to consider home solar systems, providing links to solar panel kits.


Our watt calculator guide makes it simple for you to learn how to calculate the wattage of your solar power setup. 

This is useful because knowing the wattage of your solar panel system means you know how much electricity it can produce.

When you know the capabilities of your system, you also learn how to avoid depleting or overusing it. You can do this by ensuring you don’t plug too many appliances into it.

How to Calculate Wattage

power calculator watts

To calculate wattage you need to use Watt’s equation, which uses the rules of Watt’s Law. Long story short, this equation has been used and trusted for centuries, so you can rest assured you’ll be getting the correct answer.

The equation considers three variables: wattage, current, and voltage. Watts are the unit used to mature power, amps are the unit used to measure current, and volts are the unit used to measure voltage.

The formula used is the following: P = VI. We know that these symbols can scare some people, so the formula in words is power equals voltage multiplied by current.

This means that in order to determine the power (which is what wattage measures), you’ll need the two other variables: voltage, and current. 

These variables differ depending on the components in the system, but we’ll tell you where you can find them and what the average values are.

The voltage of your solar panels should be in the owner’s manual or written somewhere on the back of the panel itself. It’s usually between 12 and 24 V per panel.

The current isn’t as simple, but there’s an easy-to-use tool that’ll help you called a multimeter. You simply connect the device to your system, and it gives you a reading. Single solar panels usually give you between 6 and 7.5 amps of power per day in full sunlight conditions.

I Need an Example

That’s what we’re here for! We‘re on a mission to make solar as simple as possible for you.

We’re going to work with the assumption that you have an average voltage of 12V, and an average current of 6A. Your math will solve for power, which is measured in watts.

P = V x I.

   = 12 x 6

   = 72W. 

It’s as easy as that. Obviously, you’re going to be plugging in different variables according to the specs of your solar setup. But figuring out your wattage is as easy as plugging the number in and pressing a few buttons on your calculator.

If you’re working with a larger system, you need to be able to convert watts to kilowatts.

I Need to Calculate Other Variables

how to calculate watts calculator

That’s not a problem. Whether you need a watt-to-amps calculator, a watts-to-volts calculator, or a watt-hour calculator, we’ve got you sorted.

We’ve even got a handy guide for calculating your solar load.

If you’re looking for some extra help, feel free to give us a call. We’re passionate about helping people make the move to solar, and we’d be happy to answer any questions you may have.

Seeing as you’re looking to calculate these variables, you’re probably in the market for a home solar system. We’d love to help with that too! Have a look at our solar panel kits for home solar DIY, we’re sure these will help you out when making the transition.

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