michcio wrote: What nonsense.
The issue of PV micro-installations is regulated by the RES Act. The owner of such an installation is a prosumer, There is no sale of energy here, only surplus production is sent to the network, which 70-80% can be taken back within the billing period. Nobody pays a penny for overproduction.
And what batteries? In an on-grid installation? What for?
In turn, in an off-grid installation you can produce as much as you like for your own needs, nobody cares.
Polish insolation is such that from 1 kWp of a PV installation it obtains 900-1000 kWh of energy. Is it worth the matter of counting? At present, the return on investment is a matter of +/- decades, and if the installation is financed in large part under a program, it is a golden deal.
I recommend getting to know the topic better because your knowledge has been out of date for quite some time.
A colleague doesn't store energy? and this is something new
and probably there is also no inverter which in principle works efficiently 8-10 years and then expensive replacement
and panels has a colleague with a 30-year warranty - I know from my experience that they do not last even 10 years
the cost of a good 3KW installation is about 25000 minimum
Added after 6 [minutes]: Although in recent years a lot has been said about caring for the planet, relatively few people decide to obtain energy in an ecological way. This is because the installation of a windmill or photovoltaic panels requires a large expense that pays off only after a few or even several years. There is also a concern that these solutions in the Polish climate will not be sufficiently efficient.
Is this really the case? APAInnovative decided to check it out. For this purpose, she used the Vision BMS proprietary smart home system, which I had the opportunity to write about. One of its functions is accurate measurement of the energy produced and consumed. APAInnovative decided to use it in practice.
Therefore, for a year, from April 2014 to April 2015, it measured the operation of a photovoltaic installation mounted on the company's headquarters building in Gliwice. The system downloaded information directly from the energy meter used in the installation, which it then analyzed and archived. These allowed us to come to several obvious and several interesting conclusions.
The amount of energy produced depended mainly on the weather.
On a sunny day, a maximum current of 4.6 A and a voltage of 120 V were achieved. In turn, the average amount of electricity generated in such weather conditions was 4 kWh. The amount of energy produced depended on the time of day. The peak moment was between 12.00 and 13.00. On a cloudy and rainy day, the value of produced energy dropped to 0.2 kWh.
solar2
During the whole year, solar cells produced 686.44 kWh of energy, worth PLN 411.86. The average price for 1 kWh was PLN 0.6. This is the price used by TAURON Sprzedaż GZE Sp. z o. o., a power supplier on the property of APAInnovative. In turn, the cost of four photovoltaic panels installed on the roof was PLN 3300. This price does not include the inverter, which is often part of the entire solar installation.
It was decidedthis solution, because the electricity produced directly from the solar installation is currently used to power the heater in the company's boiler. It is connected to a current meter and a prototype of a protection system. On extremely sunny days, it disconnects power from the solar panels and thus protects the boiler from overheating.
The installation cost would pay back after 8 years.
For this to happen, the devices would have to work in conditions similar to the test all the time. In theory, this is quite a good result, but in practice it looks quite different. It should be remembered that the profitability of an installation depends on several factors, such as its size. The smaller the investment, the less profitable it is to create it. The construction cost of 1 kW of network installation ranges between 6000 and 8000 PLN net / kW.
Other important factors are the location of the structure, the components used. This cost can be amortized by EU subsidies. In my hometown these were recently as much as 80%, so it was worth installing them. It should also be remembered that although most cell manufacturers declare 25 years of cell operation, they only grant a 10-year warranty on them. It gives food for thought. After all, this time does not come from nowhere. This means that if the panels break down a moment after the end of the warranty, we will have to repair or, in the worst case, buy the photovoltaic installation again and, consequently, wait for the return on investment again.
Our fears were confirmed by Wojciech Grajdek from APAInnovative:
In winter, the average household energy consumption is also around 20% higher than in summer. A winter day forces the use of artificial lighting, heating - even a stove (whether gas or eco-pea coal) needs power. On the other hand, storage of energy accumulated during the summer is not only very expensive, but also difficult. A better way would be to connect a solar installation with other renewable energy sources, e.g. a wind farm - this would allow, for example, to use wind blowing at night.
For this reason, a solar installation cannot be clearly called a profitable investment.
There are much better ways to generate energy. In hotter countries, this type of installation would pay off faster. However, in Poland, in a country with only 4 sunny months a year, in most cases their installation is pointless. Research carried out by APAInnovative is excellent proof of this.
