Tag Archives: PV

Back in Black…Electricity Wise

A good month or so of solar photovoltaic production and a nine day vacation put me back in the black in terms of energy production and consumption:

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Eighty two kilowatt hours of clean, green solar electricity production above my household consumption to be specific.

As you notice from the image above my bill is not zero or even net positive.  Why?  The dreaded facility charge or connection fee.  What is this?  It is the fee charged by your electricity provider for the use of the grid regardless of your electricity consumption or, in my case, production.

Now, the grid essentially acts as my battery since I have a purely grid-tied solar system.  It does not seem like a heavy burden to bear per month for the security of having electricity on demand.  However, in some states—here’s looking at you Arizona—legislators, hand in hand with their energy company lobbyists, are pursuing fees for connecting solar systems and higher facility charges in general to supposedly offset the costs incurred by these systems being active.  Some states have proposed that solar system owners pay an extra per kilowatt hour fee for each kilowatt hour that they draw from the grid.

This all seems fine and dandy to the people running electric utilities, but it may end up creating the conditions for a death spiral.  As costs for battery storage decrease and solar systems proliferate households may choose to sever their connection to the grid entirely.  In high cost or low reliability locations this is already happening.  As increasing numbers of households leave the grid the existing infrastructure is supported by fewer rate payers increasing the individual household’s share of the costs.  Costs go up and the incentive to sever ties to the grid increases thus more households make the leap.

None of this will occur overnight, so to speak, but the conditions are becoming increasingly favorable for such a transition to take place.

 

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March Brought Over 400 kWh of Solar Electricity

For the month of March my solar photovoltaic system produced just a hair over 424 kWh of electricity, which stands as my second best full month since my system went active in the last week of August 2017.  A few things stand out from the month:

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Notice the two major dips in production?  That is the impact of some spring snowfall that covered my panels under at least six inches of heavy, wet snow.  It just goes to show the potential value of a snow rake in upping my production next winter.

The other thing that is interesting, but is not something readily apparent in the production chart, is that the month was just generally more productive each day.  Granted, the days are longer in March.  However, I think that there is something to be said for the intensity of the solar radiation being higher as we head into spring.  The winter months in Iowa are known for being heavily cloud covered and this reduces the overall productivity of the solar system.

The last week, as the sun stays bright until after 7:00 PM, I have noticed that the system is producing well in excess of 3 kWh into the late afternoon/early evening.  This bodes well for the coming summer months when the array will be getting hit with the sun fairly heavily from noon until sunset.

February’s Solar Production Shows Me that I Need a Snow Broom

Check out the week between February 6th and the 13th:

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Notice the difference on either end?  That is what half a foot of Midwestern powder will do to your solar panels.  I lost several days of sunshine that would have easily pushed me past 225 kWh of production for the month.

Now I need to contemplate a snow broom or rake.  This is literally an item I never thought that I would have to consider purchasing.  Is this peak adulting?

As it stands now my system is producing approximately two-thirds of my household needs.  I anticipate that with the increased production going into spring and summer that I should easily produce 100% of my household needs in March.

Friday Linkage 10/6/2017

This country is messed up in so many ways.  What has happened in the past weeks in Puerto Rico and Las Vegas are horrific reminders of the role our politicians play in responding to disasters and shaping our future.  However, we are saddled with Trump and his merry band of Republican sycophants who care for nothing more than self-adulation, guns, and tax cuts.  In reality, Trump cares only about self-adulation and Republicans really only care about tax cuts but both are willing to use the issue of gun rights to get their desired outcomes.

I do hold out hope that there is a better and more constructive future in the works as the coalition that has propped up the right wing for the past twenty years fractures under its own internal pressures and external demographic realities.

On to the links…

The McKibben Effect: A Case Study in How Radical Environmentalism Can Work—It’s not radical if the end goal is the survival of humanity as a species.  It’s only radical because the forces opposed have deduced that the easiest way to create opposition is to label something as radical in an effort to saddle it with semantic baggage.

Skiing IS Politics—The personal is political and it always has been.

New Era of Solar Power is Now Upon Us—According to the International Energy Agency, two-thirds of the power installed in 2016 was solar.  The same agency predicts that solar growth will be the highest of any energy source through at least 2022.

US Renewables Grew 10% In 1st Half Of 2017—That is a damn good number for the first half of the year given that the number usually spikes in the second half due to large projects coming on line before the year’s end.

Growth of Green Energy Sector Surges in Minnesota—Clean and green energy is producing a lot of jobs in a lot of places.  No one really thinks about Minnesota being a hot spot for solar, but solar is big business now.

What’s Up in Coal Country: Alternative-Energy Jobs—This is what the future looks like.  It is not Trump’s attempt to use clowns like Rick Perry to prop up the coal industry for the benefit of a few crony capitalists.  It is about providing jobs for people in an industry that can help make the world a better place.

Courts are Waking up to the Cost of Climate Change—The guy at the top and his minions—here’s looking at you Scott Pruitt and Ryan Zinke—may be tools of the fossil fuel industry, but it looks like the rest of the world is realizing the true costs of these fuels need to take into account externalities.

Here are the Actual Tax Rates the Biggest Companies in America Pay—As the debate over tax reform…errr tax cuts heats up in Washington D.C. take note of what is really happening.  American companies do not pay higher taxes than their counterparts in Europe.  However, you will hear this time and again in the coming months.  It is a right wing myth.

Americans Have Soured on Junk Food. Don’t Worry, Food Companies Have a Plan.—Americans no longer mindlessly consume ever more Big Macs, Whoppers, and whatever the hell Taco Bell is making today.  Oh, we still consume the veritable shit ton of junk food but the growth has stalled.  On to the developing world the titans of garbage in a paper sack say.

Bicycle Highway in the Netherlands Built Using Recycled Toilet Paper—Leave it to the freaking Dutch to build a bike path out of recycled toilet paper.

This Entire Barley Field was Planted and Harvested without Humans—Automation in farming may happen before automation in our personal automobiles.  I do not know what the positives and negatives are of this development but robotic farming is kind of cool.

Which Is Better for the Environment: Meatless Mondays or #NoRedOctober?—Why not do both?

Ten Days of Solar in August

My recently installed and activated solar photovoltaic system was operational for 10 full days in August.  Over the course of that period of time the system generated approximately 178 kWh of clean and green electricity.  At an average daily production of almost 18 kWh the system is yielding somewhere between 70 and 75% based on system size, orientation, and estimated solar radiation.

Interestingly, during those ten days I am “ahead” approximately 95 kWh compared to my consumption.  This is probably due to the fact that late August in eastern Iowa has been chillier and cloudier than normal.  The chillier means we have not turned on the AC but the cloudier means my PV system is not generating as much as possible.  Damned if you do, damned if you don’t so to speak.

If I continue to get the prior ten days’ worth of average electricity generation I should blow past my September electricity usage because we have taken some steps to reduce our household consumption even further.  Previously we were using about 380 kWh per month across twelve months.  Since the PV system was activated we stopped using a medium sized chest freezer in our basement that was really just a repository for junk food from warehouse stores.  It was not a large or old freezer, but I have to believe that it consumed a decent amount of electricity.  Plus, September is usually a great month for sleeping with the windows open.

I am sure that the novelty of my generation exceeding my consumption will wear off, but it is really fun.  I just wish that the electric meter had one of those old style wheels so that I could watch it spin backwards in the afternoon when the late day sun is blasting my west facing array.

My New Addiction

One of the great features of my SolarEdge inverter is a monitoring system that produces a great looking dashboard:

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There is an app for my phone that shows the same information updated at fifteen minute intervals.  Damn, this is addictive.  I check it probably ten times a day to see what my new toy is doing.

Now that I mention it, I wonder what the production is right now…

How Much Electricity Will My Solar System Produce?

By the beginning of September I should be generating electricity from the solar photovoltaic panels mounted on my roof.  The system will be comprised of 16 290W panels mounted on a nearly directly south facing roof (270 degrees azimuth give or take a degree for those of you into these things).

Using a variety of calculators online I averaged out the estimates of “peak solar hours” for my system as designed and came up with the following chart to estimate my solar system’s output:

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The output is based on taking the system size (4.64 kWh) times the peak solar hours and reducing it by an assumed system yield (65%).

The system yield is probably the trickiest number to estimate.  I went as low as 65% because that level would still allow me to meet my annual electricity consumption based on a 400 kWh per month rolling average, which dipped to 390 kWh the past few months and which I hope will drop even further with some forthcoming household changes.

The yield is a function of so-called system losses and general lower production due to siting issues, shade, cloud cover, dirt, etc.  My hope is that on balance I see a system yield in the 75% range.  This would give me a little breathing room above and beyond my average annual consumption.

The worst part right now is the waiting.  The solar installers are ready to go and the panels have arrived but we are waiting on the power company and the city to sign off on the system design.  Every day that I see the sun out shining bright is a day that I feel like I have missed an opportunity to generate clean electricity from the sun.