Tag: "solar panels"


  04:15:00 pm, by Laurel Hamilton   , 801 words  
Categories: All About Solar Power, Residential Solar, Ranting

Solar Panels: Renewable but not Recyclable?!

Recent years have seen the number of solar energy systems grow exponentially as the affordability of solar and the environmental benefits make more and more sense for consumers. By the end of 2016 global solar installations will reach 310 Gigawatts! Solar already provides more than 1 percent of total energy produced and that number will continue to climb!

Spreading solar power is definitely a good thing for the planet and our pocketbooks! But there’s an elephant in the room we really need to tackle. What happens to solar panels at the end of their life? In the US, they frequently end up in landfills. As the solar industry grows, so does concern over the environmental impact of the full lifecycle for these rooftop electronics. 

Solar WasteA rooftop photovoltaic solar system provides wonderfully clean energy for the 25-30 year lifespan of the panels. Indeed panels installed in the 70’s and 80’s are still producing power so it is possible the latest technology could last much longer than 30 years! But the fact remains that we need to find a solution to the inevitable piling up of end-of-life panels sooner rather than later if we truly aim to transition to a clean renewable energy source through solar power. Recycling is particularly important because of the valuable, and sometimes rare, materials used to make panels. In addition to glass, aluminum and plastics PV panel production includes the following long list of elements, some of which are not widely available: Si, Al, Ag, Cd, Te, In, Ge, Mo, Ga, Cu, Se, Zn. With limited recycling, these materials could go to waste after a few decades of shining bright as a solar panel…rendering them far from “renewable"!

In an industry that, from a power-generation standpoint, has plenty of environmental credibility, solar manufacturers will have to receive either enough pressure or incentives to develop costly recycling programs. Panel manufacturers certainly are aware of the issue and many would like to ensure their products are as sustainable as possible while taking advantage of reusing panels’ critical elements. The Silicon Valley Toxic’s Coalition reported that 14 of the companies surveyed for their Solar Scorecard have said they would support public policy to reduce waste. Some solar companies are ahead of the game and already have collection programs in place; particularly in Europe where policy already pushes them to do so. Third party companies in Europe, such as PV Cycle, are actually doing quite well in the panel recycling industry, achieving a process for recovering 96% of a silicon panel’s materials! Here in the US, however, there simply aren’t enough places to recycle panels and there aren’t enough panels (yet!) to make developing these solar waste programs economic. 

Solar RecyclingIn Europe, solar panel disposal falls under the European Union’s Waste of Electrical and Electronic Equipment (WEEE) directive and is strictly regulated. Universal regulation doesn’t exist in the U.S. at the federal level yet. However, state policy will likely be the initial driver for PV disposal programs.

As the leader in US solar installations with a call to reach 50% renewables by 2030 California should definitely be the state to set the bar in addressing PV waste. In fact, the California Assembly Committee on Environmental Safety and Toxic Materials enacted the Photovoltaic Panel Collection and Recycling Act in 2015. Senate Bill 489 addressed the difficulty in categorizing solar panels as hazardous waste versus universal waste. To be classified as hazardous and subjected to regulation, panels must fail to pass the Toxicity Characteristics Leach Procedure test (TCLP test). But most panels pass the TCLP test. By designating them as universal waste the state can subject them to universal waste management regulations. Also encouraging… SB 489 states the legislature’s intent to:

(1) Foster a comprehensive and innovative system for the reuse, recycling, and proper and legal disposal of end-of-life photovoltaic modules.
(2) Encourage the photovoltaic module industry to make end-of-life management of photovoltaic modules convenient for consumers and the public, to ensure the recovery and recycling of photovoltaic modules, which is the most efficient and environmentally safe disposition of end-of-life photovoltaic modules, by developing a plan for recycling end-of-life photovoltaic modules in the state in an economically efficient manner.

The bill requires that the department collect an annual administrative fee for the PV Panel Collection Administration Account. The Photovoltaic Panel Collection Administration Fund is established in the State Treasury and will cover the department’s costs for implementation and subsequent programs followed by all California photovoltaic panel manufacturers, groups, or organizations subject to solar panel recycling requirements.

However, the vast majority of panels manufactured outside California state lines aren’t affected by the state bill. We must work at the national level and with other states to adopt a plan to deal with both domestic and internationally manufactured PV waste if we hope to continue to grow a truly renewable energy resource. Consumers and stakeholders across the solar industry need to work together to demand action!



  08:24:00 pm, by   , 303 words  
Categories: All About Solar Power, Solar Economics, SEIA

Intersolar Conference Hilights Solar Growth

The 20th Annual Intersolar North America Conference got underway this week and its growth reflects that of the industry it showcases. More than 800 exhibiting companies from over 30 countries are arrayed (pun intended) over more than 170,000 square feet of floor space. (More than a few people will be exhibiting sore feet before this is over!)

The show’s exhibition space has grown by 30 percent from the year before - an impressive number until you realize that the solar industry itself effectively doubled in 2010.

Along with its bigger cousin, Solar Power International (which this year will be held in Dallas in mid-October), Intersolar North America allows industry players to display their wares - from the latest advances in solar panels and inverters to the smallest component in the Balance of System space, like WEEB clips (used for grounding) and flashings.

Here are a couple of highlights so far:

  • Suntech has announced the introduction of two new solar panels including a 290 Watt model designed for large-scale solar installations.  Along with the new product roll-out, Suntech is extending its limited product warranty from five to ten years - making it one of the longest warranties in the industry.  (Suntech also offers a separate 25-year power output warranty.)
  • Enphase Energy is showing of its hot, new 215 Watt micro-inverter and the “Engage” cabling system (seriously, that is what they are calling it - they had a contest to pick the name!).

Here is a video showing some other interesting elements of the show:

Who better to give some predictions about the future of solar in America than Rhone Resch, President of the Solar Energy Industry Association?  Check out this interview:

And finally, of course, there is lots of time spent just having a good time!

Solar pros enjoy a Tweetup at Intersolar NA 2011

(The conference is in San Francisco this year - so how could you NOT have a good time?)


  12:43:15 pm, by Jim Jenal - Founder & CEO   , 2739 words  
Categories: All About Solar Power, Solar Economics, NABCEP

What You Need to Know About Commercial Solar Power in Three Easy Lessons - Part 3: Understanding Your Bid

Editor’s Note: This is the third in our three-part series on what you need to know about Commercial Solar Power.  Check out the first two parts here:

Along the path to installing a commercial solar power system, a business or building owner must first understand the hidden details in their current electric bill and the solar power rebates and tax incentives that are available to them - as we previously discussed in the first two installments of this three-part series.  The next step is to actually contact a number of solar power installation companies and assess their bids, choosing the one that will be the best match for you.  That process - finding the right installer by understanding the bids provided to you is the subject of this post.

Finding an Installer

Before you can ever get a bid, you have to contact a solar installation contractor to come out to your site and give you a proposal.  Actually, you should contact at least three contractors so that you have a set of bids to compare (more on that process below) - but how do you find them?  Well, you could choose based on who has the most ads on TV or the Internet, or you could rely on Cousin Billy’s recommendation - but somehow that just doesn’t seem sufficiently, scientific for a project like this.  There has to be a better way - and there is.  Here are our thoughts on how to identify properly qualified contractors for your job.

NABCEP Certification

NABCEP Certified solar pv installers - Brad Banta, Velvet Dallesandro and Jim JenalThe North American Board of Certified Energy Practitioners - NABCEP for short - provides the most rigorous certification process of solar installation professionals in the industry.  Not to be confused with their entry level Letter that merely proves that the person has taken an introductory course in solar,  the NABCEP Certified Solar PV Installer™ credential is the Gold Standard for installers and consumers alike.  Earning NABCEP Certification requires the successful candidate to have an educational background in electrical engineering or related technical areas (including an IBEW union apprenticeship program), at least two solar installations as the lead installer, and the successful passing of a 4-hour written examination on all aspects of solar power system design and installation.

As NABCEP notes:

When you hire a contractor with NABCEP Certified Installers leading the crew, you can be confident that you are getting the job done by solar professionals who have the “know-how” that you need. They are part of a select group of people who have distinguished themselves by being awarded NABCEP Certified Installer credentials.

NABCEP’s website offers a database of all Certified Solar PV Installers - just enter your zip code to find the installers located near you.  It is with great pride that we point out that at Run on Sun, all three of our owners are NABCEP Certified Solar PV Installers™ - and we know of no other solar power company in Southern California that can make that claim.  (Try it - click on the link above and enter our zip code: 91105.  There you will find the entries for Brad Banta, Velvet Dallesandro and yours truly!)

CSI - Go Solar California

A second source of solar installers is the California Solar Initiatives’ Go Solar California website.  Every installer who has done a solar power installation for a CSI utility (i.e., SCE, PG&E or SDG&E) will be included on this list.  Unfortunately, there are no other criteria associated with getting listed - and there is limited verification done to guarantee that the listed installer is reliable.  If your job is in California, your contractor should also be on this list - but this is a double-check only - not a starting point for your search.

Your Utility and/or Building Department

Another source for information about solar installers is your local utility’s point person for solar rebates.  This person deals with installers on a daily basis, and while s/he won’t give you a specific recommendation, they may be able to warn you off of an installer whom they have learned is less than reliable.

Similarly, the folks in your local building department deal with installers regularly as part of the permitting/inspection process.  Once again, they won’t be in a position to provide referrals, but they may be able to give you a warning if there are red flags associated with a contractor that you are considering.

Local or National?

Solar installation companies come in all sizes - from national organizations that have crews installing systems all across the country, to local operations that only work in a limited geographic region.  To be sure, there are pluses and minuses on both ends — maybe lower prices for the national chain due to economy of scale in their purchasing versus greater attention to detail from a local company that lives or dies based on how well it satisfies its local customer base.  And, of course, money spent on a local company tends to stay in the local economy - another consideration in tough economic times.

What to Expect During the Site Evaluation

Congratulations - you have identified three companies to bid on your commercial solar project - what should you expect from the process?  Here are three necessary steps that an installer must do to provide you with a proper proposal.  If any of these steps are missing, be very skeptical of their resulting bid.

  1. They will review a year’s worth of your electrical bills - Every proposal begins with an assessment of your needs and that is determined by reviewing your electrical bills.  While some utilities allow you to download your usage and costs from their websites, that is rarely as detailed as the full bill itself.  You will recall from Part 1 of this series - there really can be some nasty surprises hiding in your electric bills.  So plan on having copies ready - or better yet, scan them, have them in a PDF file, and be prepared to email them to your installer when you first contact them.

  2. They will go on your roof - Nothing takes the place of actually walking your roof, taking proper measurements, and identifying any shading issues that you might have.  While many commercial roofs appear to be “unshaded", a solar professional knows that appearances can be deceiving and will not rely on a client’s claims but will instead do a proper shading analysis.  (If you have any questions about this, demand that the installer provide you with the output from their shading analysis - if they didn’t perform a shading analysis, that is another red flag.)  Remember - your utility requires a shading analysis as part of the rebate process so if your potential installer didn’t do one, how can they know what your rebate will be?

  3. They will check out your electrical system - One of the major variables in commercial solar is the nature of the interconnection between your solar power system and your existing electrical infrastructure.  While in a residential setting this is usually nothing more than adding a circuit breaker to your existing service panel, in a commercial setting this may involve transformers, 3-phase systems and/or line-side taps - all of which increase the cost of the installed system.  A professional installer will review the interconnection issues when they visit your site and adjust their bid accordingly.

Comparing Apples to Apples

You did it!  You found three installers with great credentials who came out to your site and each one did a careful evaluation.  Now you are holding in your hand a thick stack of paper from the three installers and they don’t look anything at all alike!  How to make sense of all of this?

One good way is to have the installer come in and present their proposal to you (and any other decision makers on your team).  A professional installer should be happy to spend some quality time with you and your team to explain the proposal that was given to you - but keep in mind that they are very busy people.  Do your homework first - compile your questions and those of your team (if they will not be participating in the meeting) so that your time together can be as productive as possible.  As part of that due diligence, here are some things to look for as you compare these bids.

Solar Panels

All solar panels are not alike and although they may seem like a commodity to you, there are a number of ways in which one “200 Watt Solar Panel” will differ from another.  Here are the key considerations:

  1. Efficiency - The efficiency of a solar panel tells you how much nameplate power per square foot the panel will deliver.  This is a very important attribute if your available space for solar is limited.  However, efficiency is expensive - if you have lots of roof space for solar, the value of this factor drops dramatically.

  2. Temperature performanceTemperature performance - Somewhat perversely, all solar panels degrade in their performance as they get hotter.  Some panels do much better in the heat than others.  (Sanyo panels have the best temperature performance of any panel that we have seen.)  You will find this on the solar panel data sheet as Power Coefficient/°C.  You would like this number to be zero.  It won’t be, but the smaller the magnitude of this negative number, the better.  But again, better temperature performance comes with a price.

  3. Manufacturer reliability - Pretty much all solar panels comes with a 5-year warranty on workmanship and 25 years on performance, but the value of that warranty is entirely dependent on the reliability of the manufacturer.  Lots of cheap solar panels are now on the market from start-up operations in Asia.  If you have a problem five years from now and you want a warranty replacement, how likely is it that the manufacturer will still be in business?  A 25-year warranty issued in 2011 is of no value at all in five years if the company disappears in 2015.  Ask your potential installer about the history of the company that is standing behind that warranty and then do your own homework on this vital reliability factor.  Be prepared to pay more for solar panels coming from the most reputable manufacturers.


Commercial inverters range from large, central inverters to a collection of string inverters to even micro-inverters (one inverter per solar panel) in some settings.  You should check for: a) the efficiency of the inverter (should be in the 95-97% range with the higher the number the better); b) whether monitoring is built into the inverter or must be added; c) the warranty period applicable to the inverter; and d) the manufacturer’s reliability.  Inverter recalls in the solar industry are rare, but they have been known to happen.

There are trade-offs associated with the different approaches - a central inverter consolidates your equipment in one place and makes for a clean, cost-effective and efficient system, often with sophisticated monitoring capabilities built-in.  Yet a central inverter represents a single point of failure for your entire system - if the central inverter fails, your system will produce nothing until it can be repaired.  In contrast, using a series of smaller string inverters may look more cluttered, and interconnecting them for monitoring purposes may be more complicated and costly.  However, by distributing the inverter function over a number of devices, you have diversified your risk - if one inverter fails, the others are unaffected and you will continue to produce some energy while the faulty device is repaired or replaced.  Most commonly, small commercial systems - those below 50 kW - may well benefit from using multiple, smaller inverters.  As system sizes increase, however, the cost-savings and ease of installation of the central inverter probably makes it the preferred approach.

Inverter configuration is ultimately a design choice and your installer should be able to explain to you why they have made the choice that they are recommending.


We already touched on the value of warranties from equipment manufacturers, but what about the warranty from your installer?  In California, an installer is required to offer a 10-year warranty on their workmanship.  However, a company that has only been in the solar business for a couple of years (or less!) cannot offer proper assurances that they will be there to back-up that warranty.  Here’s one hint - if your potential solar installer was in the business before the recession hit, they are probably in this for the long haul (and they have demonstrated enough business savvy to survive the worst economic climate in more than fifty years - not a bad credential).

Rebate Calculations

Your installer should have done a calculation based on your utility’s rebate structure to estimate what your rebate will be.  These estimates should be comparable from one bid to another but if they are not, demand that your potential installers provide you with the output from the rebate calculator that they used to produce the estimate.  If they refuse, or if the rebate calculation shown doesn’t square with the rest of their bid, you can scratch them off your list of potential candidates.

Are You Comfortable?

You cannot be completely comfortable making such an important decision until you have had all of your questions answered.  Your potential installer should be happy to spend whatever time you reasonably need to be assured that you have all of the information in hand.  (But please remember, these are very busy folks so use their time wisely.)

The following are the analyses that you should insist on receiving, and having explained to you before you make your decision:

Utility Savings Analysis

You want to know what your savings will be from your new solar power system and this analysis should answer that question.  Specifically, it should consist of an estimate of the solar energy (in kWh) per month that the system will produce (usually tied to the output of the utility’s rebate calculator or some comparable method) and the value of that energy based on the utility’s rate schedule applicable to your site.  A simple-minded analysis that assumes that all kWh’s of energy are worth the same fails to meet this standard, as we explained back in Part 1.

Return on Investment graph

Return on Investment
Internal Rate of Return

Given the energy saving starting in Year 1, the cost of the system, any O&M costs, the anticipated rebate from the utility, and the tax benefits anticipated for the system, your installer should map out for you the cash flows associated with your system.  That analysis should indicate when the system will break even and what the internal rate of return over the lifetime of the project will be.  There are several variables in this analysis - the amount of annual energy cost increases from the utility, the degradation of the system’s output over time, and the marginal tax rate (federal and state) for the system owner, to name a few.  A competent analysis will identify the assumptions used in each of these areas.

Cost per kWh

Cost per kWh graph

While it is common in the solar industry to express the cost of the system in dollars/Watt, that is a misleading statistic at best since it masks variables affecting real world performance.  A far better metric - and one that your installer should be able to provide you - is the cost per kWh for the energy that will be produced by the system over its anticipated lifetime (again, usually assumed to be 25 years).  The calculation is actually quite simple - determine the total out-of-pocket costs for the system owner over the system’s lifetime (including purchase price less rebate and tax credits/grant, plus all O&M costs) and divide it by the total amount of energy to be produced (allowing for the system’s performance degradation over time).

We prefer this number because it reflects the real world performance and it allows for direct comparisons against the client’s previous costs for energy.  Indeed, we typically find costs per kWh in the 10-11¢ range compared to utility costs of 15-19¢ starting in Year 1.  But because the energy cost for the solar power system is fixed over its entire lifetime versus the cost of energy from the utility which is constantly rising, the graphical comparison is quite compelling.

Just Do It!

Now it is up to you - you have all the information you could possibly want from one or more highly qualified solar installers.  Now is the time to pull the trigger and Go Solar Now!  There will never be a better time and every day that you wait is costing you money.  Give us a call and we will get you started!


Jim Jenal is the Founder & CEO of Run on Sun, Pasadena's premier installer and integrator of top-of-the-line solar power installations.
Run on Sun also offers solar consulting services, working with consumers, utilities, and municipalities to help them make solar power affordable and reliable.

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