5. Solar Energy


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Monthly report: January 2019

Figures as per 31 January 2019:

  • 060.155 kW  produced; 2,196 kW expected per year, now remaining 1,763.146 kW;
  • € 10.74 earned;
  • 23.58 Kg CO2 emission saved; 1,155 Kg CO2 expected to save, now remaining 985.22 Kg;
  • equals 0.08 trees planted; total 0.57 trees.

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Monthly report: December 2018

Figures as per 31 December 2018:

  • 043.565 kW  produced; 2,196 kW expected per year, now remaining 1,823.301 kW;
  • € 7.24 earned;
  • 17.11 Kg CO2 emission saved; 1,155 Kg CO2 expected to save, now remaining 1,008.80 Kg;
  • equals 0.06 trees planted; total 0.49 trees.

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Monthly report: November 2018

Figures as per 30 November 2018:

  • 111.960 kW  produced; 2,196 kW expected per year, now remaining 1,866.866 kW;
  • € 18.49 earned;
  • 43.96 Kg CO2 emission saved; 1,155 Kg CO2 expected to save, now remaining 1,025.61 Kg;
  • equals 0.16 trees planted; total 0.43 trees.

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Monthly report: October 2018

Figures as per 31 October 2018:

  • 217.174 kW  produced; 2,196 kW expected per year, now remaining 1,978.826 kW;
  • € 35.87 earned;
  • 85.13 Kg CO2 emission saved; 1,155 Kg CO2 expected to save, now remaining 1,069.87 Kg;
  • equals 0.27 trees planted; total 0.27 trees.

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Since 08 October 10.00AM we are connected to the servers of SolarNRG. From there all solar panel installations are available to see your “green” profit by day/month/year. There is also a screen where your whole installation is displayed with the profit per panel, accumulating over the day:

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This picture was taken 09 October 2018, 08:35AM. Just after sunrise. That is the reason that the day total (green, right upper corner) is still so low: 15W.


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Today, 2 October 2018, from 10.30AM till 07.15PM the solar panels were installed on our roof:

However, as the installation of the panels, the inside electric cable work and all the paperwork had finished after sunset (about 6.30PM), there were no results for this day. Then it took time to install our installation on the servers of SolarNRG in Germany. As from 8 October 2018 we can check the solar power installation on the computer, on the screen of the converter (pictures below) AND on a smartphone:

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On the picture: the middle section Vdc represents the voltage that the panels give in a single current power; the left section Vac represents the voltage in alternating current, as we use in Western Europe. The right section represents the number of Watts produced that day (in this case: at 2.30PM 1,109kW). The P_OK indicates the number of panels that are functioning; in our case that should always be 10/10.

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This picture is taken just before bedtime: only the alternate current number is used now. There is no input from the panels, so the production in Watt is zero.


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Our house and the installation places of the panels (red cirkels).

On the flat roof: 5 panels.

On the slanted roof: 5 panels.

Gross: 10 solar panels, all costs included; € 4,814.98 / £ 4,300.22 / CA$ 7,427.00. Tax refund because the investment in Green energie: € 705.66 / £ 630.22 / CA$ 1,088.46. Nett costs installation: € 4,109.32 / £ 3,670.00 / CA$ 6,418.54.

Technical figures:

  • solar input: 88%,
  • CO2 reduction/year: 1,155kg,
  • own energie creation/year: 2,196kWh
  • covers 43% of the largest consumption in the last 5 years (5,050kWh)

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This is the most efficient power position versus time: in wintertime at 10:50am GMT+1 (UTC+1). You can check that at the shadow of the chimney on Pierre’s sundeck. Next Saturday we change to summer savings time. Then this situation will be at 09:50am GMT+1 (UTC+2).


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After discussions with the supplier/installer of the panels and also with the Dutch community for house owners (VEH), which has set up the activity, we have made a master plan for placing the panels. The installer can have an other opinion, as he does not work with the measurements, but with satellite images of the house.

However we plan the following:

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On the flat part of the roof, over the nett width of the house (5.60m – 19ft) 5 vertical panels  of each 1.0m width and 1.65m highth (3.3ft x 5.5ft).

Solar surface flat roof: 5.0m x 1.65m = 8.25 sqm (88.8 sqft)

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The top roof construction on the right side is not very effective. On the left side of the window we have a usable top roof surface of 1.20m (4ft) width and 3.90m (13ft) highth. That implies 2 vertical panels, in total 1m width and 3.3m highth (3.3 ft x 11ft). Above the window there might be space for a horizontal panel, or the alternative 1 vertical panel on the right side of the window.

Solar surface top roof: 3.0m x 1.65m = 4.95 sqm (53.3 sqft)

Total solar surface 13.2 sqm (142.1 sqft)


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Given the facts, that the size of the solar panels are 1.00m wide and 1.65m high (vertical position) AND that I now know the sizes of the surfaces where the panels should be installed:

  1. flat roof length 3.10m
  2. flat roof width 5.60m
  3. top roof highth 3.90m
  4. top roof width 1.20m

I have the following options:

  1. flat roof: 5 panels in vertical position, on the front side;
  2. two rows of 3 panels in horizontal position, 1 row on front side and 1 row against the top roof;
  3. on the top roof, left from the window: 2 panels in vertical position, considering that the panels need 3.30m (2 on top of each other).

In case of option 1 & 3 I can have 7 panels, in case I choose for option 2 & 3 I can have 8 panels. Anyhow, the company which installs the panels will advise about the best option. So far the SOLAR NEWS for now.


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We asked for an offer for 6 panels. That would cost € 320 per panel, including installation, all cables etc., and a monitoring system: [1] to see yourself how many energy in Kwh you are “collecting”, [2] what quantity you use yourself, [3] how much you sell to your energy company. However, the choice for 6 panels was just an estimate. I asked Peter, our neighbor, if I could have a look at our own roof from his garden, as his backyard goes much more deeper than ours. Then it was clear, that there was place enough for more panels. PLUS: Peter was enthousiastic about our plans and decided to participate in the project. 

I ordered and made a downpayment to have the roof inspected. If at the time of the inspection it may be clear, that solar panels will not pay back the costs, negotiations are stopped and you get the down payment back.