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Lessons Learned Installing Battery Storage Systems Feb 14, 2023

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Batteries are becoming an essential part of home solar systems. With solar-connected batteries, homeowners can avoid paying peak utility electricity charges. Batteries can provide backup power during blackouts. And if you’re in California, after net metering ends in April 2023, you will need batteries to avoid peak electric rates. In the old days, automobile-style lead acid batteries were used for backup power and time-shifting energy use. I still have holes in my old blue jeans where battery acid splashed (my kids think they are fashionable now). Starting in 2016, lithium ion batteries became popular for home use. Now, over 50% of our customers are installing batteries with their solar systems. My guest on this week’s Energy Show is Magnus Asbo, Senior Director of Technical Marketing for SolarEdge. I’ve known Magnus for almost 15 years, starting when we worked together on the first AC solar module. He’s a wealth of knowledge when it comes to designing and installing practical battery systems. Some of the questions that Magnus and I cover in this week’s Energy Show are: - What are the real world kw and kwh limitations of battery systems? - Every battery manufacturer offers a 10 year warranty on their batteries – what are the terms and limitations of these warranties? - Rooftop solar systems don’t need a lot of care and feeding. Do battery systems need more attention? - Is it easy for a solar installer to start installing batteries, and do they need an electrician on staff? - How does the UL-9540a building code affect the locations in which batteries can be installed? - Are there additional software and communication requirements for installing battery storage? - Why do I need a battery after net metering ends in California? If you’re thinking about installing battery storage with your solar system, you’ll get a lot out of this week’s Energy Show.

What's an Atmospheric River.. and Why Should I Care Jan 05, 2023

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According to Wikipedia -- which has supplanted the Oxford English Dictionary and Encyclopedia Brittanica as the world’s definitive source of information -- an Atmospheric River consists of narrow bands of enhanced water vapor winds that form over the oceans. In plain English, Atmospheric Rivers are windy rainstorms that dump a huge amount of water in a relatively short time. They account for about 50% of annual precipitation – so these storms are critical to reducing California’s current drought conditions. Since our crews work on rooftops, we’re very concerned about rooftop safety. As a result we always look at forecasts when planning rooftop work for our customers. This morning I noted that significant rain is projected for eight of the next nine days. In over 22 years of installing solar in Silicon Valley I have never seen such a severe and extended series of storms. The National Weather Service is predicting that this next atmospheric river storm will be as bad or worse than the recent New Year’s Eve deluge. You can look at the detailed forecast yourself. Suffice it to say that wind gusts will be in the 35-55 mph range, with rainfall estimates ranging from 2 to 10 inches. With storms like this one -- especially when the ground is soggy -- it’s reasonable to expect many power failures due to downed electric lines and flooded underground wiring. Storm drains will clog, leading to widespread street flooding. And some local creeks are already at flood stage. But there is some good news. Reservoirs and aquifers are filling up, reducing drought conditions. Sierra snowpack is growing, so there should be more water available for summer hydroelectricity — and the skiing is terrific. Your rooftop solar panels are getting cleaned from these downpours. If you have a solar-powered battery backup system, please take note of two features available on most systems. First, we recommend that you increase your minimum battery reserve to 50%. Second, enable the Weather Guard or Storm Preparation feature on your system, which will automatically keep your battery at 100% state of charge if there is an imminent bad weather event or PSPS. To learn more about these crazy atmospheric river storms and how solar and battery storage can keep your lights on, fridge cold and family connected, listen to The Energy Show.

Top Ten Residential Solar Questions May 03, 2013

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In our opening Energy Show we discuss frequently asked questions about residential solar.

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