Solarpraxis and Milk the Sun develop a calculating tool for existing installations

For the first time a freely accessible online calculator determines the current sales value, which can be aimed at by owners when selling a photovoltaic installation. This free of charge calculator is applicable in countries all over the world, and it accounts for various parameters such as age of the installation, the time of connection to the electricity grid and the share of electricity used for owner’s own purposes. It shows the sales price for the aimed selling point and the yield, which the buyer can reach with the photovoltaic installation. Two Berlin-based companies, Milk the Sun and Solarpraxis, have jointly developed the calculator.

“If one wants to resell an installation after a couple of years, it is often problematic to obtain a reliable sales value” explains Felix Krause, the CEO of Milk the Sun. “Many factors determine the achievable level of sales price. Next to the amount of feed-in-tariff, operation costs and power dissipation of an installation, an important role is played by tax deductions, financing costs and the current inflation rate.” These and further factors are included by the online calculator in the determination of sales value and yield. With the help of this tool, a potential seller can run simulations on how the price of the installation varies according to the time when it would be sold or other factors.

“The calculating tool offers a first objective reference point about the sales value of solar installation to both sellers and buyers. It is especially interesting for bigger photovoltaic installations” says Alexander Woitas, manager of the engineering department at Solarpraxis AG. The calculation formula is based on commercial calculations and technical experiences of Solarpraxis. “Subsequently the precise sales values should be determined individually. An encompassing technical installation testing is necessary for establishing the exact sales price.” On the online calculator portal, an owner of a PV system can request a free of charge offer for solar installations testing. Additionally, there is a possibility to present a solar installation for sale on the portal.

The online calculator is available the hree languages German, English and Italian.



Milk the Sun and Solarpraxis AG offer calculator

About Solarpraxis AG

The Berlin-based Solarpraxis was founded in 1998 by Engineer Karl-Heinz Remmers and Kay Neubert as BGB Company. Since 2006 Solarpraxis AG is traded on the stock exchange. As one of the leading advisory and service companies in the renewable energy sector, the company employs over 50 engineers, architects, publishing experts and event managers in the fields of engineering, publishing and conferences.

70 Percent of Europeans Would Back Renewable Energy

A recent survey by the European Commission titled “Attitudes of Europeans towards air quality” has found that seven out of ten Europeans prefer renewable energy over traditional alternatives. Less than ten percent of those surveyed expressed a preference for fossil fuels. However, 18% of Europeans still maintain that nuclear should be considered a priority energy source.

Erneuerbare Energien gewinnen insgesamt an Akzeptanz©Steve Jacobs

Renewable energies: Trailing behind, Romania and Bulgaria

The results by country show that acceptance and awareness of renewable energies like photovoltaic or wind power is highest in Portugal at 82%, followed closely by Germany, Austria, Denmark, and Spain (each 81%). A few have much lower regard for renewables, notably Romania (49%) and Bulgaria (45%), where less than half the survey participants recommended renewables as a priority. The Europe-wide average lies at 70%.

A center of interest which is drawing more and more attention is energy efficiency. The Europe-wide average for agreement that energy efficiency should receive a priority focus is at 28%. Here, Slovakia is the leader with 44%, and trailing the pack is Cyprus with only 18%.

Support for nuclear energy Europe-wide at 18%

Nuclear energy is supported above all by the Czech Republic. 44% of Czechs surveyed believe nuclear to be an energy source worth supporting, followed by Sweden with 33%. In Germany nuclear gained an approval rate of only 8%, with the lowest endorsements coming from Austria and Cyprus at 4% each. The overall European average is 18%.

Also of interest is that 33% of Poles name shale-gas as a priority. Estimations place Poland over the largest shale-gas reserves in Europe, and Poland is interested in stepping up extraction via the fiercely debated fracking technique. In all other European countries approval of this means of energy production lies under 11%, Italy, Sweden and Finland being the most opposed at 3%.

Conventional fossil fuel energy providers seem to no longer have a place within the European energy mindset. A union-wide approval average of 8%, with a maximum of 19% in Lithuania, demonstrates that not even one in ten Europeans would name conventional energy production as a priority. Especially low is the support from Sweden, Slovenia, Italy and Poland (4% each).

Men support nuclear energy more than women do

Socio-demographic analyses of the survey show that men are more likely to prefer nuclear power than women (23% vs. 13%). Among participants over 55, energy efficiency (24%) and renewable energies ( 65%) also find fewer supporters.

Education also plays a large role. Only 59% of those polled who ended their education at 15 or earlier indicate renewable energies as a focus, as opposed to 75% of those educated until age 20.

Sources: Europäische Kommission (Attitudes of Europeans towards air quality report)

How to find an unused area for photovoltaic installations on Milk the Sun

The search of unused areas for solar installations to lease or buy on is an easy and uncomplicated process. On our start page, click on “PV installations & project list” and in the following sub-menu choose “Projects”.

After the choice of “Unused areas” and “Ground mounted”, you have a chance to narrow down the projects by giving in the size in meters squared.  With a click on the numbers underneath the big scale, you can insert the exact size of the project you are looking for. Further option to narrow down your search can be found under “More filters”.

Photovoltaic in the USA: New Jersey

State: New Jersey
Area: 22,588 km²
Population: 8.8 Mio.
Percentage of Renewable Electricity: 8.8%
Installed Photovoltaic: 900 MW

Übersicht über den PV-Markt von New JerseyNew Jersey is the fourth smallest state in the United States of America. Nevertheless, it is home to 8.8 million inhabitants, making New Jersey the most densely populated state in the entire US. The state lies just south of New York NY, North America’s most populous city. Trenton is the state capital with 84,000 inhabitants.

Second largest Photovoltaic Market in the USA

Despite its small size, with over 900 MW of installed PV capacity New Jersey is tied with Arizona for the second largest solar energy market in the USA. Ample state incentives have resulted in many solar manufacturers setting up their production facilities there.

In New Jersey municipalities, businesses and private land owners are investing heavily in roof-top photovoltaic installations.

Sonne gibt es in New Jersey auch für Photovoltaik

Sunset on a Beach in New Jersey

Photovoltaic Policy and Renewable Energy Goals

The Renewable Portfolio Standard (RPS) requirements of New Jersey are some of the most aggressive in the entire USA. By Energy Year 2021, 22.5% of electricity produced in New Jersey will come from renewable energy sources. At least 1,100 MW is required to be sourced from off-shore windparks. Additionally, at least 4.1% of purchased electricity will have to come from Solar sources by 2028.

Electricity providers can meet these requirements by purchasing Renewable Energy Credits (RECs), similar to the system in place in California. Solar Energy Credits (SRECs) are distinguished from other RECs to facilitate the completion of the 4.1% solar energy carve-out.

For windpower, biomass and fuel cell factories, there are additional subsidies  through the Renewable Energy Incentive Program.

New Jersey also has a Net-Metering program, through which residential PV system owners obtain credit according to the electricity they feed into the grid.

Finally, sales tax exemptions exist for the purchase of solar modules for installation.

Further programs and campaigns for Photovoltaic and Renewable Energy

Investments in energy efficiency and renewable energy are also subsidized through New Jersey’s Clean Energy Fund. For 2001-2012, the fund made $2.4 Billion available.


Series Photovoltaic in the USA:

1. Photovoltaic in the United States of America (USA) – An Introduction
2. California
3. New Jersey

Sources:, DSIRE,,


Snowboard company integrates photovoltaic modules in a snowboard!

This is one of the most unusual ideas, using the advances in the photovoltaic industry. The workers of Signal Snowboard (a firm specialised in an artistic design of snowboards and snowboarding equipment) have covered a snowboard with really thin layer of solar cells. Thanks to that, small devices could be recharged during snowboarding.

Photovoltaic modules do not change the properties of a snowboard

Since the applied thin layers of solar cells are more flexible than commercially-used snowboards, the use of modified board does not feel different than usually. And of course such snowboard can be used as a charger for electronic devices also when one does not snowboard on it. For instance: on the way back to hotel with a car, when the board rests on roof luggage rack. It seems like a cool idea to snowboard with your own mini-solar installation!

In the following video, the workers of Signal Snowboards show how this snowboard is being constructed.





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