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### Energy vs. power

This short series is to help build some foundational knowledge that will help you understand the building blocks of Solar.

#### energy

Energy is the capacity to do work. Measurements for energy include calories, BTUs, Joules, and Watt-Hours. We would use the term energy when discussing how much capacity you have in your battery bank. If you are on grid you will get a utility bill from the power company and that will normally provide you with the number of kWh or Kilowatt-Hours you used last month. A Kilowatt is 100 watts and a watt hour is one watt being used for one hour.

#### POwer

Power is the rate of consuming or producing energy. Watt is the unit of measure we use do discuss power. A watt is defined as amps multiplied by volts. A solar panel rated for 100 watts can produce 100 watts ofpower at any given time under perfect conditions. If it produced those 100 watts for 1 hour it would store 100 watt hours of energy. Understanding that a watt is always equal to one volt multiplied by one amp will be very important as we continue this series.

Two considerations when sizing solar systems are how many watt-hours of storage do you have(ENERGY) and how much power can the system deliver at any moment(POWER)