The most basic electrical formula there is: Volts x Amps = Watts.

Basic Formulas for Measuring Watts vs Amps vs Volts

Watts is a measurement of how much power something uses in the terms of voltage and current (Amps). Amps measures current. If you compare electricity to water flowing in a pipe, voltage is the amount of pressure while amperes is the amount of volume. An object does not run on current alone or for that matter, voltage alone. An object requires both voltage and current (Amps). The amount of power an object produces varies. So that is where Watts come in.

Watts vs Amps vs Volts
To Calculate Watts vs Amps vs Volts you will need the basic formulas.

Watts x 1000 = kilowatts (Kwh)~ the measurment used by your Utility company. They charge in Kilowatts which is watts x 1000 = a kilowatt

Wiring Watts vs Amps vs Volts Volts x Amps = Watts
Watts divided by Volts = Amps

You will need 2 numbers to figure the amount of current.

You need to configure this to determine the size of wiring to connect your batteries, solar array as well as wiring to the gird.

Use the following formula for all electrical devices~
Watts of device x 24 hours per day = Daily Watt Usage.
Daily Watt Usage x # of days in month = Monthly Watt Usage.
Watts divided by 1,000 = Kilowatts.
Kilowatts x the Kilowatt rate charged by the power company = the Monthly Operation Cost of that Device~

An inappropriate size on any component will diminish the production of your components. Size does matter.

There is one area that it is important to understand the difference between Watts vs Amps vs Volts and that is the area of solar energy. If you were to implement a system of PV solar panels, you would need to calculate the amount of wattage your household uses in order to figure the number of panels you would require.

Download Calculators:
Photovoltaic System Calculator
Energy Usage Assessment Calculator

Continue to explore the videos upon this site for additional clarification.

Where to Purchase Kill-O-Watt Meters:


More Kill-O-Watt Meters Here ~

Compare Solar Kits Here~


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18 Responses to “Calculate Watts vs Amps vs Volts ~ PV Solar System”

  1. Newby says:

    I have 4 225 ah agm batteries, 6 volt.
    My solar panels are 2 250 watt canadian solar 24 volts
    If I do a serial set up on the batteries and a parallel wiring of the panels, will I have enough to power a freezer that uses a bit under 1000 watts per day?

    Is the the best way to wire this setup?

    Any comments on doing a serial – parallel on the battery bank?


  2. Johnny Fortner says:

    Thanks for finally talking about Calculating Watts vs Amps
    vs Volts for a PV Solar System. Liked it!

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  14. softcellelectrical says:

    That is really a nice post. If you notice I do not edit out bad comments (except foul language). I tire of these no-it-alls that screen all their comments. Thanks for the comment and feel free to share my page with whom you see fit. Best regards, John

  15. ricardopipiles says:

    I’m planning buy a battery 13 volts the plant is to use 20 watts for 2 hours how big should i buy the battery ? any suggestion thanks.

  16. softcellelectrical says:

    I need more info, but on what you gave me I would recommend something rated at about 80 watt hours minimum. A Mid sized motorcycle battery should do fine. For numerous recharges I would go with a lithium or other high dollar battery. A good R/C tech at a hobby shop could probably help you out quite a bit. Again, I really need more data for any meaningful recommendation.

  17. EPmessi9800 says:

    This will help me on my high school finals!

  18. softcellelectrical says:

    Thanks, there are also numerous other formulas. Feel free to share with friends.

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