Tel: (845) 626-2627   Home   Contact  
Sun Volt

Sun Volt Solar

earth, the final frontier

Clean Energy, Clean Environment

We are at a cross roads in human history, we can choose to continue on as we have been, or we can make a change to improve our future and quite possibly the future for several generations to come. We are here to promote energy independence, a better environment, a secure future and a higher return on investment for your hard earned dollar. It is what I believe in, it is why I am in the solar business.

Energy and the Federal Budget

02 Feb 10 | Commentary

I remain convinced that subsidizing oil, gas and coal companies to produce cheap energy is the wrong thing to do.  The President seems to agree with this position as the 2011 budget has removed about 2.7 Billion Dollars in subsides for those sectors.  Some people disagree:

This is the industry pulling in billions of dollars in profits. It is best placed to come up with ways to reduce the carbon intensity of fossil fuels and discover breakthrough technologies.

Because the fossil fuel industry has a record of clean energy investment, oh no wait… Because they strongly believe in climate change, thus have every intention of reducing their own product demand, no, no… Okay, I got it, they have been strongly advocating for the renewable energy sector in congress… Hmmm, I can’t really place my finger on it, perhaps because it is a bunch of BS.

The fossil fuels industries are the last group that a) need a subside, the first sentence from the block quote ably demonstrates that, and b) will do anything to hurt their market share in the US energy market.

I have opined here before, I’d like to see all energy subsides, including solar and wind go away.  Let everyone compete in an open market place, let consumers know the real value of the energy they are using.  This would greatly increase conservation efforts and spur on the development of renewable energy.

Tags:

02 Feb 10 | Commentary | Comments (0)

WEEB Grounding devices

28 Jan 10 | Solar Electric

On our last project, a ground mounted PV system supported by a post and beam frame, I used  Unirac WEEB grounding system (UGC-1) on the Unirac rails.  WEEB stands for “Washer, Electrical Equipment Bond.”

Unirack UGC-1 WEEB ground clip between two Sanyo HIP-205N PV panels

The electrical inspector was not familiar with the product or the concept.  I showed him the spec sheet from Unirac, which details how the grounding clip creates one electrical path through the mounting rails for the ground.  Basically, the ground clip pierces the aluminum finish on the panel frame and the aluminum surface of the mounting rail.  With that electrical connection established, a ground wire is run between all of the mounting rails and connected to the grounding electrode system.  Keep in mind, that systems should have a continuous grounding path back to the service panel ground bar and cannot be bonded to the neutral or negative conductor of the PV system.

Not all electrical inspectors would accept this method and it is not currently part of the NEC, so it is better to check with them first.  Otherwise, it saves a lot of time, effort and materials to use WEEB grounds.

Tags: ,

28 Jan 10 | Solar Electric | Comments (0)

Solar Hub

26 Jan 10 | Solar Electric

Solar Hub, any technical information you need about PV panels or inverters.

This makes panel and inverter selection much easier.  Downloading then reading .pdf files from manufacture’s web sites takes time and clogs up a hard drive.  This way, you can find out all of the critical information ahead of time.  Of course, any installation will need to have spec sheets on hand for the electrical inspector, the utility company, etc.

Tags: ,

26 Jan 10 | Solar Electric | Comments (2)

Google searchs show what the public is thinking about Solar

18 Jan 10 | General

The search engine known as Google has a handy auto complete function. If you start to type in a phrase, it tries to guess what you are looking for and complete the phrase before you can, thus making your searches easier, at least in theory. The auto complete part of the phrase is based on what people have searched for in the past.

With all of that in mind, I typed: “Why is solar…”  In the search box and let the auto complete fill out the rest.  This is the response:

why is solar...

It is Martin Luther King Jr. day, which explains the graphic at the top of the search results.  It is heartening to see that people are looking into reasons why solar is important or good.  I’d expect result #4, “Why is solar so energy expensive?” to be number one primarily because it is a question that is asked at least once on every sales call.

I believe that the general public is beginning to catch on in that most searches are looking for positive aspects of solar energy.  There is still a long way to go until the preception of solar moves from “alternative energy” to “main stream energy”  source.

Tags:

18 Jan 10 | General | Comments (0)

A right to the Sun?

04 Jan 10 | Commentary

Solar Energy Industries Association thinks so. They are sponsoring an online petition called the Solar Bill of Rights© to call attention to various law makers throughout the country to:

We declare these rights not on behalf of our companies, but on behalf of our customers and our country. We seek no more than the freedom to compete on equal terms and no more than the liberty for consumers to choose the energy source they think best.

Here is a brief list of items this petition hopes to define:

  1. Americans have the right to put solar on their homes or businesses
  2. Americans have the right to connect their solar energy system to the grid with uniform national standards
  3. Americans have the right to Net Meter and be compensated at the very least with full retail electricity rates
  4. The solar industry has the right to a fair competitive environment
  5. The solar industry has the right to equal access to public lands
  6. The solar industry has the right to sell its power across a new, 21st century transmission grid
  7. Americans have the right to buy solar electricity from their utility
  8. Americans have the right to – and should expect – the highest ethical treatment from the solar industry

Sounds good to me. Items 1,2, 4, and 8 are of particular interest to me. Some sort of national solar policy might better define how to accomplish those.

Item 2 is tricky because regulation of the utility companies has been a states issue. Many, if not most states still regulate power companies in the “Natural Monopoly” system. That is to say the state and the utility company recognize the utility is a monoploy and regulate it in such a way the the public benifits (mostly) from the existance of the utility company. Each state has somewhat different circumstances due to there location and the various conditions on the ground. Putting the feds in charge would likely create many new problems and layers of bureaucracy. Which, I don’t know about you, but I like to keep my bureaucracies on the small side.

Via: Clean Technica

Tags:

04 Jan 10 | Commentary | Comments (0)

Prism Solar Technologies

28 Dec 09 | Solar Electric, Technology

Prism Solar Technologies is continuing to grow their manufacturing facility located in Highland, NY. They took over the PLASMACO plant last March, which coincidentally, had much of the equipment and clean rooms needed to manufacture their product. PLASMACO was a subsidiary of Panasonic corporation, they manufactured Plasma screens for TV’s and computers.

What Prism Solar makes is a proprietary holographic planar concentrator™ (HPC) film that, when used in conjunction with conventional silicon photovoltaic cells, increases the cell efficiency by about 40%. According to their website, the increased efficiency allows for use of 30-50% less silicon during the manufacture process, making the the cost around $1/watt.

Here are the advantages of HPC technology:

  • Less silicon reduces cost per watt
  • Passive tracking from holographic effect produces more energy from diffuse and reflected light.
  • Cooler operation than conventional PV module, most unusable light passes through module without being turned into heat.
  • Bifacial PV cells can increase module performance when mounted over a reflective surface.
  • Lower embodied energy, the energy required to manufacture the HPC film is much less than that required to mine and process silicon.

They have four prototype modules on line in Tucson, AZ connected to Enphase inverters. One can look at the module performance on the Enlighten website. There is also a specification sheet for a 160 watt module.

According to their latest press release, they are about to create 175 new jobs in the Hudson Valley (although there is nothing on the careers page yet). All of that is good news for the solar industry and I look foward to seeing their product out in the field. I must say, it certainly looks cool.

holographic optical photovoltaic panel

I previously wrote about them here.

Tags: , ,

28 Dec 09 | Solar Electric, Technology | Comments (0)

Solar Power: Save money, increase the value of your home

20 Dec 09 | Sales, Solar Electric, Solar Hot Water, solar thermal

I have been going over some of the bills from the last few years. My utility company, Central Hudson Gas and Electric has been increasing the cost of electricity by 9% annually.

central hudson electric rates

Nine percent per year seems like quite a bit, especially since inflation has been running around two to three percent. The increases of fuel costs and energy products in general has far outpaced inflation. Projected out 25 years, the cost per kWh is $1.53! I don’t expect it to get that bad, but one never knows.

Here are some solar facts:

Based on conditions here in NY state:

  • The average home owner chooses to install a 4 KW DC photovoltaic system. This generates 4500 to 5000 KWh per year.
  • With rebates and incentives, the final system cost is about $10-11K.
  • Over the course of the system life (25 years), the electricity generated will cost $0.09 per KWh. Currently, NY electricity averages $0.158 KWh (increasing at 9% per year).
  • Without inflation, that equals a savings of $29,000.00.

Also, based on conditions in NY state:

  • the average home owner chooses to install an 80 SF/80 Gallon solar hot water system. This will supply a family of four with 80% of their hot water annually.
  • With rebates and incentives, that system cost is around $3,800.
  • Over the course of the system life (25 years), the energy converted by this system will cost $0.03 per KWh. Currently, NY electricity averages $0.158 KWh (increases 9% per year)
  • Without inflation, that equals a savings of $16,500.00.

Of course, these are long term investments. In order to realize this type of savings, a homeowner will have to stay put for 25 years. That is a rarity these days.

Solar systems retain almost all of their pre-incentive/rebate value when added to a structure as a capital improvement. Here is a list of residential home improvements and the values added to a typical house:

  1. Two story addition: 94%
  2. Bathroom remodel: 93%
  3. Major Kitchen Remodel: 91%
  4. Solar System: 90%
  5. Basement finish/remodel: 89%
  6. Siding: 88%
  7. Roof Replacement: 85%
  8. Deck: 84%
  9. Hot tub: 84%
  10. Family room addition: 82%
  11. Sun room: 75%
  12. Garage addition: 70%
  13. Backup power generator: 58%

Of course, if the rebates and incentives are considered, then the installation of a solar system is cash positive from day one. What this means is the homeowner pays $11-12K but gets $32,000 of additional home value. I can’t think of a better deal than that.

Tags: , ,

20 Dec 09 | Sales, Solar Electric, Solar Hot Water, solar thermal | Comments (0)

System verification for Enphase Inverters

16 Dec 09 | Solar Electric, Technology

In New York State, there is something called the Standardized Interconnect Requirements (or SIR) that governs how utility companies handle grid connected renewable energy systems such as Photovoltaic and Wind energy systems.

Among the requirements, usually known as “Step 5,” a verification that the system meets UL 1741 is required. This means that after a power outage, the inverter stays off for five minutes before it begins exporting power to the grid. For most inverters, the verification procedure is simple, turn off the breaker feeding the inverter for a short period, then turn it back on. Watch the LED indicators on the inverter and time how long it takes to come on line and produce power. If it is 5 minutes or longer, the system passes.

enphase energy M210 inverters

enphase energy M210 inverters

The problem with the [e] Enphase inverters is there are many of them, they are located with the solar panels, and it would be difficult to watch the LED start flashing green especially if the inverters are under a PV panel bolted to the roof. Therefore, an alternative verification procedure must be effected. One suggestion by the utility company was to use a clamp on ammeter to measure the AC current in the branch circuit between the inverters and the panel. One small problem was that some “leakage current” had been detected in previous tests of this nature.

I sent an e-mail off the [e] Enphase Energy, Inc. They responded very quickly with the following suggested verification procedure:

  1. Turn off the breakers to the array.
  2. Turn on the breakers to the array and make a note of the time down to the second.
  3. Using a clamp on ammeter, verify that the array is not producing current until 5 minutes have passed. During the non-producing period, the ammeter will show a slight current draw of 0.056 Amps +/- 5% for each installed inverter. In this case, there are 10 inverters in each string, therefore the clamp on ammeter will show 0.56 Amps +/- 5%.
  4. After 5 minutes have passed, the ammeter will show the array producing power by indicating greater than the quiescent current noted in step 4.

The test should be run when the array is in full sunlight so the AC current meter will obviously indicate the array is exporting power to the grid since AC current meters do not indicate the direction of current flow.

The second method proscribed by Enphase involves using the utility meter. This can only be used in arrays that are large enough to get the meter spinning, and should only be performed in full sunlight.

  1. Observe service meter and note direction it is turning while consuming power.
  2. Turn off main service breaker and all other breakers feed the various household loads, simulating a power outage.
  3. Turn on main service breaker and breaker feeding the inverter(s) only and note the exact time.
  4. Observe service meter. A very slight movement forward direction indicates the inverters are consuming a small amount of power in their monitoring circuit.
  5. After five minutes have passed, the meter will begin to turn in the opposite direction, indicating the inverters are exporting power.
  6. Close the breakers to the rest of the household loads.

Finally, if the inverters are ground mounted and the LED indicators can be readily observed, this procedure can be followed if the first two do not satisfy the utility company.

  1. Turn off the breaker feeding the branch circuit, if it is not already off, then turn back on.
  2. Observe the inverter(s) status LED, is should begin to flash red when AC power is applied then flash green when the inverter(s) begin to produce power. Time the period of the flashing red LED with a stop watch, it should be 5 minutes or greater.

This can be done for each individual inverter, or for each inverter string as the (utility company) representative present desires.

According to the manufacture, the system complies with the requirements of UL1741, which states that if the inverter detects that the grid has gone out of specification or has completely shut off, then the inverter will “cease exportation” of power. The inverter is allowed to draw current but cannot produce power. Therefore the small amounts of current indicated on an AC ammeter is not leakage current, rather it is the inverter consuming a small amount of power prior to in beginning operation.

Update: From Scott at Enphase Energy:

I had a brief, follow-up comment about one portion of the article. During the 5-minute wait time specified by UL-1741, the Microinverter is not consuming power. It is circulating reactive current in the A/C-filter section of the device.

I just wanted to make sure that the statement of “the inverter consuming a small amount of power prior to in beginning operation” was not potentially misinterpreted as tare-loss, with an Enphase customer thinking that he was losing some of that hard-earned energy during the 5-minute period.

No, we wouldn’t want them to think that, especially after I preached about unshaded locations and voltage drop during the sales presentation.

I have noted that these inverters come on line in 5 minutes and 20 seconds or so after a power outage.

Tags: ,

16 Dec 09 | Solar Electric, Technology | Comments (0)

DIY photovoltaics

14 Dec 09 | Solar Electric

I saw this article on MSNBC:

Solar technology is going where it has never gone before: onto the shelves at retail stores where do-it-yourselfers can now plunk a panel into a shopping cart and bring it home to install.

I suppose this was inevitable.  However, before a homeowner simply plugs a solar panel into a house, a agreement is needed with the servicing utility company.  Not doing the proper paper work can result in having the electric service disconnected.  Something the article touches on briefly.

Installing one solar panel will generate about 160-175 watts of power, depending on the temperature.  This is enough to run a desktop computer, a few lights and a flat panel TV.  Obviously, if the homeowner is serious about solar electric, a larger system is needed.

One other thing the article noted:

If you want more solar power, you can snap another panel to the first, kind of like Legos.

However, each time you snap another panel on the system, the entire system needs to be re-permitted by the utility, at least in New York State.

It will be interesting to see how this idea develops.

Tags: ,

14 Dec 09 | Solar Electric | Comments (0)

Solar Site Assessment Tool

07 Dec 09 | Solar Electric, Solar Hot Water, solar thermal

File under: Yeah, there’s an app for that.

Sun Tracker mashup

Sun Tracker mashup

I received an e-mail from Andrew about a Solar Site Assessment app for 3G iPhones.  I’ll let him tell the story:

I live in Vancouver, BC, when evaluating my own home for a solar installation I discovered a gap in the solar tools market. I have a lot of trees in my backyard and was interested in doing my own shade analysis assessment. So, I looked around and found expensive tools and manual sun plots, and nothing in between. At the same time my son happened to get an iPhone. I was intrigued with the built in compass and inclinometer capabilities, and putting two and two together I come up with an iPhone based solar assessment tool.

You can check out more at their website:

www.imeasuresystems.com/

I know in New York State, NYSERDA requires a site assessment be submitted for each application.  In order for a site to qualify for the NYSERDA rebates, it has to be 80% unshaded or more.  The rebates themselves are performance based, e.g. the better the site, the more the rebate.  This app has the ability to print out a site assessment, which is key.

Tags:

07 Dec 09 | Solar Electric, Solar Hot Water, solar thermal | Comments (0)
« Previous Posts