NetZeroMax.com

Sustainable Design for the 21st Century

Can Existing Homes Achieve Net Zero?

by Brent Sauser

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Is it possible to convert a 23 year old tract home, built in Orlando Florida, to achieve Net Zero?  Granted, not all 23 year old tract homes are created equal.  But in our specific case we can state without hesitation . . . OUR 23 YEAR OLD HOME HAS ACHIEVED NET ZERO!  How do we know this you ask?  We have proof.

After implementing a three-year plan to reduce our overall electrical consumption, we had a 7.5kW solar array installed on our roof.  The net-metered array was activated on September 9, 2015.  Since then we have tracked our daily solar production.  These are the results:

  •   Total time elapsed:  12 months
  •   Total solar production on-site:  9,375kWh
  •   Average monthly solar production:  780kWh
  •   Average monthly power consumption:  668kWh
  •   Daily average kWh (net) use from utility:  ZERO
  •   Extra solar kWh produced on site and “banked” with utility:  1,363kWh.  That means we are not only a Net Zero home, but we are Net Positive.  We produced more energy than we consumed on site.
  •   Total electrical utility costs for the year:  $126 (Minimum monthly charge to utility = $10.47.  This charge is for net meter hook-up to utility.)
  •   Total estimated yearly savings:  $2,500

Being net-metered means that we are still linked to the local power utility.  We produce electrical power while the sun shines and feed the excess power back to the utility.  At night and early morning hours we rely on the local power utility for our electrical needs.  So, we are NOT off the power grid, but rely on the grid for when the sun is down or on excessively cloudy days.

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We become Net Zero when the excess power we produce during the day exceeds the utility power we use at night and early morning.  In our case we were able to produce enough excess power to cover the difference and have 1,363kWh left over, to our credit.

Our goal was to lower our monthly expenses and in the process put $2,500 back in our pockets.  We are overjoyed with our decision to go Net Zero and will continue to monitor our daily production.   We are confident next year’s results will be similar.

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Sometimes the hardest part of any journey is taking the first step.  We have proof it IS possible to retrofit existing homes to achieve Net Zero.   Isn’t it time you find out for yourself what it will take to achieve Net Zero for your home?

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