Monday, 15 May 2017
Sunlight is a free and limitless source of energy. Solar energy produces no air pollution or hazardous waste. Solar-powered air-conditioning makes sense since it’s typically hottest when the sun is shining… and that’s when air-conditioning use is most in demand! Switching to solar could reduce your heating and cooling costs by half.
Solar air conditioning refers to any cooling system that uses solar power, which is typically supplied by photo-voltaic (PV) cells, engineered into solar panels. Solar has been around a long time, and many products are now in the 4th (or later) generation. They are available for both residential and commercial applications. Here are just a few of the types of solar air-conditioners to choose from:
Off-Grid: Units that run 100% on solar power run on DC power. These are referred to as “off-grid” because they do not require power from the utility company, e.g., they don’t have to be plugged in. An example of this type are solar-powered window air-conditioning units. They operate on DC power only (from solar panels), and use external battery backup (usually good for about 8 hours operation). The battery is so that the unit will continue to function even when the sun is not shining, like at night. A window unit is expensive – $2-3,000 – but it can be used totally “off-grid” which means there are no energy costs during operation.
Hybrid Systems: Hybrid systems use solar power when available and supplement that with regular electricity (AC power) as needed, and do not require batteries. During the day, solar power provides 90% of the system’s electricity. At night, it switches over to regular grid power. Examples of this type include room-sized/area-sized units, like a mini-split, or whole-house units, like a hybrid heat pump. One advantage of hybrid systems is that they can also provide heat during the winter. [Check out our previous posts on mini-splits: What You Need to Know About Mini-Splits, Cooling an Add-on Space, Saving Energy and Improving Comfort] .
Solar-Ready Systems: These are systems made like “traditional” central air-conditioning units, in that they use 220V AC power, but some of the electricity feeding it can be obtained from solar panels. The Lennox SunSource Home System is one such system. The more solar panels you add (from 1 to 16) the more money you can save in energy costs. You can start small and expand over time, adding other appliances, such as the home’s water heater, making a total home energy system.
There are many misconceptions when it comes to solar. For example:
Advantages are Environmental, Economic, and Comfort
There are numerous advantages to solar.
ROI: Fast Payback
The payback period for a complete system (solar-powered heat and air) is about 2-5 years. With tax credits, the cost of installation can be paid for within the first 6 months of operation! Plus, many vendors offer interest-free financing. The federal solar tax credit, also known as the investment tax credit (ITC), allows you to deduct 30% of the cost of installing a solar energy system from your federal taxes. The ITC applies to both residential and commercial systems, and there is no cap on its value. The 30% tax cut was extended through 2019, and then gradually decreases each year from 2020 through 2022, where it levels off at 10%. What’s more, a solar-powered home can actually earn money: if your house is not using all the power it is generating, you may be able to sell excess power generated back to the utility company!
It is easy to see that if you get tax breaks for installation, the system saves you half on your energy bills and you can sell energy back (making money from the system throughout its lifetime), that a 2-5 year payback can actually be quite realistic.
**Interstate AC Service is not a reseller or installer of solar panels.
Count on Interstate AC Service to help keep you up-to-date on the latest technologies. If you live in the Nashville & surrounding area, know you can rely on us for all your heating and air-conditioning needs.
Posted on 05/15/2017 8:10 AM by Tony Anderson
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