Which Solar Panels Should I Buy?

Which Solar Panels Should I Buy?

The most common questions that prospective solar customers ask is “Which solar panels should I buy?” That’s a tough question to answer, and arguably maybe not the most important question (more about that later).

I initially got into the solar business for altruistic reasons — save the planet and all that. The planet still needs saving, perhaps more than ever. But I quickly realized that the vast majority of customers were interested in saving money first (the planet could wait). So I am biased towards finding the most cost-effective system for customers. To that end, people want an inexpensive system that is reliable, high efficiency (especially if they have limited roof space), and looks good on their roof.

When it comes to the solar panels themselves (also called solar modules), all solar panels generate the same amount of electricity on a per watt basis. A 300 watt panel from Manufacturer A will generate the same amount of energy as a 300 watt panel from Manufacturer B. 24 panels with a 275 watt output will generate the same amount of energy as 22 panels with a 300 watt output (6,600 watts). Your appliances can’t tell the difference if they are using electrons from a super high efficiency panel or from a less expensive system. Nevertheless, there are clear cut differences among solar panels in terms of efficiency, aesthetics, cost and availability. On the other hand, some of the sales pitch distinctions are subjective, such as brand, quality, durability, and long term energy output.  

To learn more about critical decision factors in purchasing solar panels for your home or business, listen to this week’s Energy Show. For those of you who have read to the end of this summary, the most important question to ask is: “which contractor will install the best solar power system for my home or business?”

Weather Impacts on Solar Power Systems

Weather Impacts on Solar Power Systems

This past winter season has been the rainiest I have ever experienced in California. The good news is that the state is no longer in a drought condition. The bad news is that severe weather is occurring around the country. We are likely to continue on this trend: a polar vortex recently hit the Midwest, heavy snows on the east coast, and even Seattle was devastated with big snow storms. 2018 was the 4th hottest year on record globally. On average, the summers are getting hotter and the winters are not as cold. 

But this is a show about energy — particularly solar. Although the output of solar systems can be predicted fairly accurately, weather has the biggest impact on annual energy fluctuations [side note: the biggest monetary fluctuations come from your local utility as they raise electric rates]. Several of our customers were concerned about lower energy output from their solar system in November, December and January. We pointed out that rainy weather — including smoke from wildfires — obscured the sunlight enough to make a noticeable difference in energy output. Even our customers who had battery backup systems contacted us, but for different reasons. Many of them had multiple weather-related blackouts this winter. These customers were delighted that their refrigerators, TVs, lights and heat were all still working even though their power was out. 

While one cannot change the weather (unless your name is Dr. Evil), we can prepare for a changing climate. Please listen up to this week’s Energy Show as we discuss how weather impacts solar power system performance.

Cleaning Solar Panels

Cleaning Solar Panels

When a business or homeowner gets a new rooftop solar installation, the second question they always ask is “how often do I need to clean my solar panels.” We’ll answer that question on this week’s show — taking into account the different effects of rain, dust and electric rates. BTW, the first question people always ask is “how do I read my electric bill;” but that’s a topic for another show. (more…)

The Commercial Solar Opportunity

The Commercial Solar Opportunity

There are there are three market segment for solar in the U.S.: residential, utility and commercial. Based on some rough math, in 2018 we expect to install 5 to 7 million solar panels on homes in the U.S. In areas with high residential electric rates, paybacks are usually in the range of 4-8 years. But the utility solar segment is much larger: about 20 million solar panels will be installed by utilities in 2018. Utilities realize that it is cheaper to generate power with solar compared to coal or nuclear generation. Moreover, the combination of solar and batteries is projected to be even cheaper than natural gas in a few years. (more…)

Ten Rooftop Solar Predictions for 2018

Ten Rooftop Solar Predictions for 2018

Every year I gaze into my solar crystal ball and make ten educated guesses about the rooftop solar industry. I did OK on last year’s predictions, only completely whiffing on two,  so I’m back with my yearly list of predictions for the rooftop solar industry for 2018. (more…)

Which solar panels are best?

Which solar panels are best?

Here’s a solar industry secret: all solar panels generate the same amount of electricity on a per watt basis. In other words, twenty 300 watt panels will generate exactly the same amount of electricity as twenty-five 240 watt panels. Indeed, there are objective differences in panel cost, efficiency, aesthetics and ease of installation — and now with the upcoming tariff, even availability. But differences such as brand, assembly quality, country of origin and projected degradation rates are much more subjective since they are based on manufacturer’s claims and not based on objective third party studies. (more…)