Frequently asked questions
BEFORE CONSTRUCTION OF A PHOTOVOLTAIC INSTALLATION
What does a PV plant consist of?
The main components of a PV system are:
- PV modules that convert solar energy into electrical energy;
- mounting structure for installing the modules;
- inverters that convert the DC voltage from the modules into AC;
- cables. connectors;
- distribution and combiner boxes;
- earthing and lighting protection systems.
Is my roof suitable for installation of PV modules?
How big should the rooftop be in order to put PV modules on it?
1 photovoltaic panel has an area of
We give you an example of the area required for the following systems:
For a 5kW system (about 9 panels – 550 W):
- pitched roof – according to the specifics of the pitch, the size may vary, you need about 40 sq.m. rectangular area
- flat roof (when installing the panels at a 20° slope) – 60 sq.m
For a 30kW system (54 panels):
- pitched roof – 165 sq.m
- flat roof (when installing the panels at a 20° slope) – 220 sq.m
Can I sell the electricity?
You can build a PV plant and either sell all the energy produced or priority consume the produced energy and only sell the excess to the grid company.
Building such plants is accompanied by coordination procedures and documents by the EDC and the municipality. More about the procedures can be found here here.
Can I heat water with PV modules?
More information can be found here.
What kind of documents are needed for selling the electricity?
Applications can be found here:
Application for research – Електроразпределение Юг ЕАД
Application for research – Електроразпределителни мрежи Запад АД
Application for research – Електроразпределение Север АД
In order to build an FPP entirely for the sale of energy at a preferential price, you must meet the following conditions:
FEC to be installed up to 30kWp installed power and to be installed on the roof;
The property should be in an urbanized area;
The property should have a legal building, which should be connected and have an open account to the energy distribution company.
You can find more about the whole administrative procedure here.
How long is the warranty of the PV modules?
Warranty Conditions for Solar Panels
Jinko Solar
Product Warranty:
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Standard: 12 years
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Extended: up to 15 or 25 years (for Tiger Pro and Tiger Neo series; depends on model and market)
Performance Warranty:
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Tiger N-Type / Neo
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Duration: 30 years
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Degradation: ≤1% in the first year, then ≤0.4% annually
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Remaining power: ≥87.4% at year 30
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Tiger P-Type / Cheetah
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Duration: 25 years
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Degradation: 2.5–3% in the first year, then 0.5–0.7% annually
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Remaining power: ~80.2–83.1% at year 25
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ZNSHINE Solar
Product Warranty:
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12 years (covers manufacturing defects; applies to all standard models)
Performance Warranty:
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Standard Panels
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Duration: 25 years
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Remaining power: ≥84% at year 25
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Bifacial / Glass-glass Panels
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Duration: 30 years
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Remaining power: up to 87.4% at year 30
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Trina Solar
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10 years – for selected products, primarily dual glass models or specific series (see Sec. 1 d)(i), e)(i), f)(i), g)(i), j)(i))
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12 years – for most standard models including many P-type or PERC backsheet modules
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15 years – for certain advanced PERC and N-type modules (see Sec. 3 c))
Power Output Warranty:
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25 years – for most backsheet-based modules:
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degradation: up to 2.5% in the first year, then 0.55%–0.65% annually
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remaining power: ≥81.9% to ≥84.8% at year 25 (depending on product type)
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30 years – for dual-glass modules:
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degradation: up to 2.5% in the first year, then up to 0.4%–0.5% annually
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remaining power: ≥83.0% to ≥88.125% at year 30 (depending on product and technology)
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Are the PV modules hail resistant?
What is the purchase price for the electricity from a PV plant?
For FTPP up to 5kW, installed on roofs and facades – BGN 201.35/MWh, with a net specific production of 1,380 kWh/kWp.;
For FTPP from 5kW to 30kW, installed on roofs and facades – BGN 168.24/MWh, with a net specific production of 1,380 kWh/kWp.
Frequently asked questions
AFTER CONSTRUCTION
OF A PHOTOVOLTAIC INSTALLATION
What maintenance does a PV plant need?
How much electricity will the PV plant produce for 1 year?
The annual performance of a photovoltaic plant depends on the equipment installed and the overall project implementation.
For comparison:
- 5kW PV plant will produce for 1 year around 7MWh.
- 15kW PV plant will produce for 1 year around 21MWh.
- 30kW PV plant will produce for 1 year around 42MWh.