Frequently Asked Questions

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Category: faq

The main advantage of solar photovoltaic systems (solar power stations) compared to other power sources is high reliability and long life cycle – 30 years and more (it is expected to work for at least 50 years).

Cheap Chinese solar panels and inverters are manufactured by unknown companies that have no image or authority in the international market. There is no real quality guarantee on their products, even though they are visually identical to quality analogues. At the initial stage of commissioning, it is difficult to actually check the electrical parameters in the house, the defect is revealed during the process of operation.

The price of the solar photoelectric station is determined by:

1. The origin and the quality of the components (solar modules, inverter, electrical/ technical equipment, materials adn frame construction);
2. Qualified installation according to international standards;
3. Warranty.

The cost of 1 watt of solar power station installed with European components, according to international standards, by the company “Sun House varies from 1 to 1.5 euros (the price mainly depends on the power of the station).

To estimate whether our prices are expensive, here is a table published by the International Energy Association IEA in 2014 (after 2014, prices fell by 15-20%):

Table 1. Typical PV system prices in 2013 in selected countries (in USD)

Of course, the question may arise: if current prices are so high (according to the table), then how has this industry developed and spread in the world?

Answer: In every country (85 in the world), solar photovoltaics has evolved as a result of protectionist policies by the state, such as subsidies, long-term, low-interest government loans, state electricity tariff policies, and more.

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The peak power of one square meter of solar photovoltaic panel is about 150-180 watts and it produces about 1000 watts of energy per day (average annual value).

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No. Due to the warranty liability, we only install high quality components supplied by our foreign partners and provide warranty service for 2 years.

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Heating the house solely with solar energy is unrealistic and unprofitable. However, it is possible and economically advantageous to use solar energy to provide hot water for the bathroom and kitchen.

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It will take about 2-3 kilowatts of peak solar power.

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The prices of the grid-tied solar plant vary according to the brands of the components and to the installed capacity : the price of 1 watt of installed voltage starts from 1 euro. A station that fully provides the average family with electricity costs between 2,000 and 10,000 euros.

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There are three types of solar photovoltaic systems:

I) Autonomous (OFF-GRID)
II) GRID-TIED.
III) Hybrid-Micronetwork (MICRO GRID)

The first (autonomous, OFF-GRID) consists of:

solar modules (1), solar charge controller (2), battery (3) and inverter (4). The electricity generated by the solar modules during the day is supplied to the battery through the solar charge controller, where it is accumulated. Through the inverter, the constant voltage of the battery is converted to the standard voltage, which makes it possible to use the household appliances so-called load (5). These types of systems are used to power non-electrified objects.

Pic. 1. Autonomous (OFF-GRID) photoelectric system

The second (connected to the network, GRID-TIED) mainly consists of:

solar modules (1), network inverter (4), circuit breaker (6) and two-way smart-meter (7). During the day, the electricity generated by the solar modules (constant voltage, current) is transmitted directly through the inverter to the standard, AC voltage and after synchronization is supplied to the central network (8). The electricity flowing in from the network and consumed by the household appliances (load) (5) is recorded by a two-way smart meter. Such systems are characterized by high reliability and long (more than 25 years) service life.

Pic. 2. Network-connected (GRID-TIED) photoelectric system

The third (Hybrid-Micronetwork, MICRO GRID) consists of:

(1) power generators operating on renewable energy (solar, wind); (2) diesel generators; (3) large capacity batteries; (4)- the management and control system; (5) electrical consumers (settlement, village, houses); (6) the central network (if any).

Pic. 3. Hybrid-Micronetwork system (MICRO GRID)

The MICRO GRID management system allows the connection to the central network (if any) and the integration to it, as well as disconnection from it and the autonomous operation.

MICRO GRID technologies are focused on the use of local renewable energies. As a result, it is no longer necessary to transmit energy over long distances, which reduces losses and the cost of electricity.

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Sun House House Ltd has been working in the solar energy industry for more than 30 years. More than 500 off-grid and grid-tied photovoltaic stations of different capacities have been installed on the territory of Georgia.

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