Is solar energy the most affordable type of power?


There are increasingly more articles written about solar being the most affordable type of power.  Knowing what’s occurring on this planet with electrical energy pricing, we’re nonetheless fortunate that our pricing is affordable in New Zealand.  Compared with Europe; the place costs are 3x to 4x costlier than in NZ, solar in Europe is a no brainer and has grown by a staggering 47%. 

In New Zealand, the common value for a kWh electrical energy in New Zealand is 21 cents.  This is excluding line costs.  This is essential to know when evaluating this with a solar system which continues to be related to the grid, which a lot of the solar programs are. 

Let’s calculate a mean set up for a solar system.  First, I’d like to clarify the necessity for a battery.  Most of you aren’t at home in the course of the day. Most of the electrical energy you employ is in the course of the night, when the solar isn’t shining anymore.  What occurs in the event you don’t have a battery?  The extra electrical energy can be fed again into the grid, and once you want the electrical energy, in the course of the night, you will need to purchase it from the grid. The purchase value is at all times larger than the promote value, and due to this fact doesn’t sound optimum. 

For this instance, we’ll use an AlphaESS Battery System.  We are inserting 20 x 415-Watt panels on the roof, putting in a 6 kW inverter with a 8.2 kWh battery. Let’s assume a mean set up value of $30,000.  This, in fact, relies on a number of various factors associated to your particular property. We can set up solar on each roof, nonetheless there are variations in value. 

In common this solar system will produce about 11,000 kWh per yr of electrical energy. This relies on the course and pitch of the panels.  If we design your solar system, we’ll be sure that the panels are optimally positioned and can produce that output.  If this isn’t attainable, we’ll focus on this with you.   

When you have got battery storage, you’ll use solar electrical energy in probably the most environment friendly manner. For instance operating a dish washer and washer in the course of the day, we assume that every one solar energy can be consumed by you, and there can be minimal export again to the grid. 

In this text the lifespan of the solar system is defined and is calculated to be a minimal of 25 years.  We additionally know that the solar panel’s manufacturing slowly degrades through the years, nonetheless it’s nonetheless assured to be producing electrical energy at 85% after 25 years.  Taking that under consideration, the solar system will produce 260,000 kWh in it’s lifetime. 

The value per kWh of solar electrical energy is due to this fact 30,000 / 260,000 = $0.115 (11.5 cents) 

The common value of a kWh in New Zealand is 21 cents. So, even in New Zealand, with the comparatively low cost kWh costs, Solar is half the worth. 

What will occur with electrical energy costs going ahead? 

Let’s assume the same improve in electrical energy costs, as what occurred final 25 years.  The value for electrical energy doubled.  Looking to the remainder of the world, we will anticipate a good steeper improve, nonetheless, lets assume it’s a must to pay 42ct per kWh in 25 years.  Calculating your financial savings over the minimal lifetime of the solar system can be greater than $80,000. 

If you’ll go to the financial institution with $30,000 you would want 4.3% curiosity per yr to get the same saving. 

So, solar is an unbelievable funding, and is the most affordable type of power.


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