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I bet one of the first questions many people find themselves asking is "Where do I start?"
This seems some-what obvious to a designer, but not always for a home owner. There are four aspects that determine a system size; future requirements, roof space, budget and the starting point for everyone… your energy consumption.
This information will help you to determine the “average daytime consumption” for your home. By arming yourself with this information, you have a starting point to understanding how we determine system size.
Step 1. Depending on whether you have access to online records or paper, this will vary.
For our example, we are using paper bills from Synergy.
Collect your energy bills together, preferably 12 months worth to cover the seasonal usage.
*We have included a visual aid below as a reference.
On our paper bill, you can see we have circled (AVERAGE DAILY CONSUMPTION)
This is the figure we want to know, the dollars spent are irrelevant. We’re not done yet.
Step 2. Combine these figures, taken from each bill.
Divide that figure by the number of bills in hand.
This result provides you with an average daily consumption for that extended period.
Step 3. Yet we know solar panels only generate power during daylight hours and we must
take this into account.
We have found that a 50/50 split is a good average amongst home owners,
though depending on your circumstances, this day/night split may vary.
Considering a 50/50 split, we want to determine the day usage for the home.
*If fractions aren't your thing, multiply this average figure by 0.5 (50%)
We have split that “daily” consumption in half to match our day/night usage.
Our new figure is what we call your (AVERAGE DAYTIME CONSUMPTION)
The outcome of this exercise is to help the average homeowner develop a starting point for their own unique design. By including this figure in our system design, we can accurately determine a minimum size system. At the time you choose to consider battery storage, this formula will change. Retain that figure and leave the rest to us.