4 steps to assess your monthly and annual power consumption. Find out the ideal size of your solar energy system.
4 Steps to asses your monthly and annual power consumption
What you need to start with
Determining your load profile and your consumption trends is the first step towards properly sizing a solar power system.
Performing this study will enable you to understand the size of a solar system you will need.
Some PV installers might charge you for this, but it’s a fairly easy task to do by yourself, so no need to hire anyone for this!
This step-by-step approach helps you calculate your annual/monthly power consumption in less than ten minutes.
STEP-1: Collect data from utility bills
To collect all the necessary information, you will need to have a look at your past electricity utility bills.
The more bills you will use, the more accurate your study will be.
I advise to have electricity bills for a complete year, as 12 months will show your electricity consumption pattern over the entire year.
STEP-2: Record consumption
Record the data from the bills on a piece of paper.
Are you still with the same number of people in your household? To get accurate results the number of people using electricity should be similar as the past year.
STEP-3: Calculate monthly usage
This total sum of all bills will provide you with the amount of electricity consumed by you over the period of one year.
Divide it by 12 to obtain your monthly usage, divide it by 52 to obtain your weekly usage or divide it by 365 to obtain your average daily electricity usage.
It can’t be more simple..
STEP-4: Assess results
Once you obtain your average monthly electricity usage, you can use this figure to size your solar system.
Assessing the results to size your solar system is the most important step. Make sure to add a 15% to 20% contingency margin to your results.
If you are planning to expand your load profile (planning to buy more appliances in other words), add another 20% to cover for those future expansions.
The final figure is the minimum size of the solar system that you would need to cover for all your present and future needs.