Can I install a solar PV system myself?
The ready-made configurations of solar PV systems that we offer include connection diagrams that make their installation easy to perform by the customer. Off-grid systems, depending on their size, require basic knowledge of electrical engineering and their self-assembly is completely acceptable. It is important to follow the attached diagrams and instructions for installation and use of the separate components. In on-grid systems, the requirements for compliance with security conditions are slightly different. Relevant protocols and declarations of conformity by technical persons must be submitted for connection to the network.
What is the technical warranty of the solar PV modules ?
The technical warranty of the solar PV modules, which we integrate into our solar PV systems is guaranteed by Munich Reinsurance Company: The modules come with a 12-year technical warranty. Additionaly, there is a 12 year guarantee for maintaining 90% of the power capacity of the modules and a 20 year guarantee for 83% of their power capacity. The solar PV modules, which we integrate into our ready-made solar PV systems and the off-grid systems which we design come with a 10 year tehnical warranty and 25 years for maintaining 80% of their power capacity. Detailed information about the technical characteristics of the solar PV panels which we offer, can be found in our online store at www.solarhouse.bg.
If the location does NOT have access to an energy source other than a solar PV system, can I use energy appliances with a power capacity larger than that of the system ?
Not possible, unfortunately. It is for this reason that when calculating the power of an off-grid system, all electrical appliances, including their nominal power capacity and hours of usage, are taken into account. If you turn on a device that consumes more than the maximum power of the inverter, it will simply report an error and stop. If the overload is very high, there is a risk for the inverter fuse and even the inverter itself burning out.
I have a house and I would like to power it with solar energy entirely. How many solar PV modules do I need?
With off-grid solar PV systems households rely entirely on the electricity they produce. These systems are most often used when there is no access to the grid or it is very expensive to connect to it. Or you aim to avoid the lengthy procedure that comes with getting connected to the grid. This type of solar PV system can have all kinds of power capacity. An off-grid system can power from a simple lamp to an entire production base. The sizing of off-grid systems is a complex process and depends on many factors. It depends on whether the system will be used all year round or seasonally. It depends on the power of the appliances, how many hours a day they will be used, the location of the system and many more. In order to calculate exactly what kind of off-grid system you need, you must first gather information about the appliances you will use and their unit capacities. Estimate how many hours a day they will work and then send us an inquiry so that we can offer you the best solution. Contact us for a free consultation.
Can I use a three-phase inverter with a single-phase grid?
No, unfortunately, it is not possible to connect a three-phase inverter to a single-phase network. Only the opposite scenario is possible - connecting a single-phase inverter to a three-phase network. The three-phase inverter will not start without seeing three phases and a "zero". You could contact us for a free consultation.
How much will the efficincy of the solar panel decrease if it faces south-west, with a 40 degree slope?
A specialized software is required to calculate the fall in efficiency at different orientations and at different inclines. It is also possible to calculate what the losses are and, accordingly, what the production will be if you change the slope or orientation of the solar PV panels. For this purpose, however, it is good to consult with experts in the field. You could contact us for a free consultation.
Is the application of steel possible for the mounting structure or does it have to be made from aluminium?
Of course, the mounting structure does not have to be made entirely from aluminium. When we build our systems, we want to be sure that they will withstand a MINIMUM of 20 years in outdoor weather conditions. That is why we use only aluminum, galvanized and stainless steel for the supporting structure. Remember that building a solar PV system is a long-term investment and short-term savings usually lead to trouble.
Can a hybrid system be transformed into a battery-free off-grid system?
The term "battery-free off-grid system" is a bit confusing, because a battery-free solar PV system can hardly be off-grid. That is, in the absence of batteries, it can only work when the amount of energy produced by solar panels is large enough to power the energy appliances. If there is no additional power supply from the mains or from a generator, the solar system becomes very unreliable. In our opinion, the answer to this question is rather NO, because we say again, the system would lose its autonomy.
How can I curtail the "excess" electricity from the inverter to the grid?
The curtailment of "excess" energy to the main grid in most inverters is done by means of the so-called "smart" electricity meter or also known as a Smart Meter. Its function is to constantly monitor the consumption on site, whether it is a house, warehouse or a large production facility.The device transmits this information to the inverter 24/7. In this way, the inverter knows at any given point in time whether the amount of energy produced is greater than the amount consumed. It is when production exceeds consumption that this "excess" energy begins to return to the grid. If the inverter detects a situation in which the production is greater than the consumption, it immediately reduces its production so that it is equal to or less than the consumption of the site. In this way, the return of energy back to the EDC network is avoided.
What is the annual yield of a 5kW,10kW, 30kW solar PV plant?
The annual yield of a solar PV system depends on a number of factors, including its location, whether it will be built on a rooftop or land, the slope and orientation of the property / building with regards to the sun. The figure below shows the estimated production of a ground-mounted solar PV plant with a capacity of 30kW, located in the region of Pazardzhik, with an ideal slope and orientation with regards to the sun. This system will produce 39,265.12 kWh per year. A system with a power capacity of 5kW will produce 6,544.19kWh under the same conditions, and a system of 10kW - 13,088.37kWh per year. In general, in Bulgaria, a power plant operates between 1200 and 1400 hours per year, depending on the region in which it is installed. That is, if it is 10kWp, at 1200 hours per year, it will produce about 12,000kW of energy per calendar year.