Frequently Asked Questions about solar collectors

What do you need to know to install solar collectors in a private house?

In principle, solar collectors can be installed in any unshaded place, on the roof surface, in the roof, on the facade of a building. Also possible "free" installation on the ground. Most importantly, you need a sunny place and a desire to purchase an environmentally friendly, reliable, stable source of energy, which, when prices for traditional energy sources rise, will save significant funds.

How long did the sauleskolektors.lv system pay off?

Depending on the location of the swimming pool (whether it is indoors or outdoors, covered at night, etc.), the type of fuel replaced and other aspects, the system may start to pay off after 36 months.

How does sauleskolektors.lv swimming pool heating system work?

Solar collectors are installed on the roofs on the south side or placed elsewhere in the swimming pool in the owner's territory.

The required number of collectors depends on the size of the pool and the specifics of use. The collectors are connected in a closed circuit to a specially designed chlorine-resistant pool heat exchanger. The closed circuit is filled with non-toxic and non-freezing glycol liquid "SolarEko", which also has anti-corrosion properties.

When the sun's radiation reaches the absorbing surface through the solar glass, heat is generated. If the pool needs heat, the modulating pump switches on and the heat from the collectors enters the heat exchanger.

The heat exchanger transfers heat (but not glycol liquid) to the pool water. Heat exchange is performed instantly before the pool water is returned to the pool after filtration. If the temperature in the collectors is higher than in the pool, then our system will heat the swimming pool from the sun.

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How much do solar collectors cost?

Qualitative, 2 m2 large solar collectors according to the Latvian climate cost not less than 800 EUR / unit.

Since 2007, we have tested several types and manufacturers of collectors and have realized that the most suitable for our climate are manufactured by the German / Slovak joint venture Thermo|Solar, which has the best value for money and invaluable experience gained over 35 years of operation. , scientific research and the implementation of very diverse and complex projects.

With the increase in the volume of orders and the development of logistics, we are able to offer products at a very attractive price. (prices updated in September 2020)

1 piece. Thermo|Solar TS300 flat solar collector costs 850 EUR + VAT

1 piece. Thermo|Solar TS400 flat vacuum collector costs 1000 EUR + VAT

If the price of a manufacturer's solar collectors exceeds 2000 EUR, one must also be careful.

Keep in mind that when you install solar panels, you are buying the amount of energy that your entire solar system will produce in 35 years or more.

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What does a solar collector system consist of?

Sauleskolektors.lv solar system consists of solar collectors, their connection and connection kits, mounting frame and load-bearing structures, solar boiler or combined boiler - heat accumulator, hydro unit, automation, temperature and pressure sensors, heat carrier fluid, stainless steel or copper pipes with heat insulation and consumables.

All nodes of the sauleskolektors.lv system are of high quality and extremely long-lasting. They require minimal maintenance as they are made of stainless and environmentally friendly materials.

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How does sauleskolektors.lv "Solar heat pump system" for heating work?

This system has two essential parts: a heat pump with large heat exchangers and flat vacuum solar collectors.

It is an effective combination. On sunny days, unused heat from the solar collectors is discharged directly to the ground, but when there is not enough direct solar energy, the heat pump "pumps it" out of the ground. Thus, the sun heats the house, the water in the boiler and the swimming pool, if any. The "solar heat pump system" prevents the ground circuit pipes from freezing, which is often the cause of the inefficiency of conventional heat pumps.

It can be combined with an existing heat pump. A very important component of the "solar heat pump system" is sauleskolektors.lv flat vacuum solar collectors, which are manufactured and installed according to the patented technology and are particularly efficient. Other collectors cannot be used in the "Solar heat pump system", because only sauleskolektors.lv flat vacuum solar collectors are safe against condensation.

The energy consumption for the operation of a "solar heat pump system" is much lower than for a conventional heat pump and any other heating system.

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Is the sun in our climate zone enough to fully supply the house with heat and hot water?

There was a Song Festival in Latvia, where the closing concert was called "Latvia - the Land of the Sun". In Latvia, the sun shines more than, for example, in Denmark, which ranks 5th in terms of the area of solar collectors per capita in Europe.

Already now in Latvia it is possible to use solar collectors for basic heating, fully supplying the house with heat and hot water from solar energy. This type is called a "solar heat pump system". The average efficiency for such a system is 8.

Should special rules for building a house be taken into account when installing solar collectors? Should the roof be built differently?

The roof plane should be large enough and oriented as far south as possible. The east-west and west-facing roof planes are also suitable for solar panels. The slope of this plane should be 60 (+/- 15) degrees.

The roof can also be flatter, but then the collectors will have to be mounted above the roof. Trees that could obscure solar panels after 20-30 years should not be planted in front of the house. As sauleskolektors.lv collectors are light and as durable as the roof, they are suitable for practically any roof. If there is no space on the roof or it is too shaded, solar panels can also be placed on the wall of the building or on the ground.

How does the sauleskolektors.lv heating support system work?

There are several ways in which sauleskolektors.lv creates solar systems for heating support, depending on the type of main heating of the building. The solar system for heating support also provides water heating from the sun. The most commonly used type of solar heating support system in Latvia is with a heat accumulator. In such a system, the hot water boiler is first heated from the sun, then the system automatically switches and heats the heating heat accumulator.

We also offer combined boilers-heat accumulators, which save space in the boiler room and prevent the formation of harmful bacteria in warm water. To provide heating support in Latvian conditions, not less than 10 m2 of solar collector is required. In winter, sauleskolektors.lv heating support system will perform preheating, supplementing the existing heating system. On a sunny autumn or spring day, enough heat is stored to heat the house all night. During the summer, such a system becomes especially powerful, so you can additionally heat the swimming pool or wet basement.

Sauleskolektors.lv offers the most appropriate solution for obtaining energy for solar heating support for each object. The total energy savings per year reach 30%.

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Are solar collectors suitable for heating?

In order to use solar collectors for heating support, it should be remembered that the system will need 2-3 times more than hot water, but during the summer, if there is no rational use of heat, such as a swimming pool or heated basement, the equipment will be idle.

If someone promises you that a 10 m2 absorbing surface will be able to heat a 100 m2 terraced house, then you know - you are lying lying in front of your eyes.

If the goal is to feel effective heating support, but do not experience collector downtime in summer, then you should look at the combination of flat vacuum collectors TS400 and heat pump DUO. Such a system can get 3-5 times more energy from solar collectors during the heating season, because all low-temperature solar collectors are used. Also temperatures of +20o C and even 0o C in solar collectors are applicable, which are usually unusable for heating systems. The number of solar collectors for heating support in the DUO system is smaller than in other solar heating support systems, but flat vacuum solar collectors must be used

TS400. Other solar collectors are perfect for water heating, swimming pool heating, etc. but only TS400 flat vacuum solar collectors can be used in systems with heat pumps. The rest will be damaged by condensate that will form when working at such low temperatures.

In Latvia, in cooperation with the ThermoSolar plant, such a DUO heating support system has already been installed. It works in real conditions in a populated private house and can be viewed in person by anyone interested.

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Why don't we recommend vacuum tubes for solar systems?

There are collectors consisting of vacuum tubes made of very thin (1.4-2mm) borosilicate glass. Virtually all factories producing vacuum tubes are located in China, where this type of solar collectors are the most common. Their impact resistance is insufficient for the Latvian climate, where there are regular storms that break branches and lift various objects into the air. Hail grains in Latvia also tend to reach dangerous sizes for vacuum tubes.

Tubular solar collectors are not certified by any reputable testing laboratory in Europe because they cannot withstand the stringent impact resistance requirements. In winter, the temperature in Latvia is often around 0o C. As the snow melts, it gets between the pipes of the solar collector, but when the frost returns, the ice can break from the pipe made of thin (1.4-2 mm) glass. The design of tubular solar collectors rarely fits into the architecture of buildings. In addition, they are less effective in summer, when the sun's intensity is highest.

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