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    Solar

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Estonia

Solar Market Outlook in Estonia

Estonia is one of the largest emitters of carbon dioxide per capita in the Baltic region and in the European Union. For centuries, its reliance on burning oil shale for electric production also means that it has one of the worst carbon footprints in the world. This is why the Estonian government has made a bold step towards reversing all of the environmental impact it has caused by focusing on renewable energy sources. 

Despite its carbon footprint in the past, Estonia has managed to generate 107 MW of solar PV capacity (as of 2019). This is only the beginning as there are more solar deployments being planned as part of the new policy that was enforced by the Estonian government to boost development of solar and other renewable energy sources.

To help this boom, the government has lowered the import price of solar PVs and equipment to make solar panels more accessible. Right now, most of the installations in Estonia are small-scale but the officials believe that this is a small step towards the right direction. 

Currently, there is no information available yet if the Estonian government plans on holding any auctions to increase solar investments in the country. 

Solar Energy Equipment Supply Capacity in Estonia

The clean energy campaign is only getting started in Estonia. As such, there are limited options when it comes to the solar manufacturers and suppliers. But this is expected to change soon as more policies are implemented to encourage solar investments. 

Top 8 Major Seaports & Logistics in Estonia

The logistics and trade involving solar equipment and components in Estonia is not as busy as other European Union nations. Nonetheless, there are plenty of seaports that can facilitate should there be a growth in demand. A few examples would be via the major seaports in Estonia such as

  • Helternaa,
  • Port of Tallinn,
  • Kunda,
  • Pyarnu,
  • Kuivastu,
  • Rohukula.

Electric Breaker

Electric Breakers

When installing a solar panel system, you have to be familiar with the electric breakers and how it works with a solar PV system to avoid future electric problems. The electric breaker is one of the main components of a solar power system that provides safety mechanisms. If ever the electrical wiring of your system has too much current flowing through it, these breakers can easily cut the power until your solar installer can fix the system’s problem. 

For today’s article, we will discuss electric breakers and their function in solar photovoltaic systems.

What is an Electric Breaker?

An electric or circuit breaker is an electrical switch designed to protect electrical circuits from damage caused by overloading of current or a short circuit. The basic function of an electric breaker is to prevent the current flow once protective relays detect a fault in the system. 

Although it is frequently interchanged with a fuse, which is the simplest Over Current Protection device (OCPD) in electrical circuits, a circuit breaker, is a much-evolved type of device that interrupts the current flow. The main difference between the two is electric breaker is resettable and the fuse is not. The fuse sacrifices itself while protecting the system to overheat, while the circuit breaker can withstand hundreds and thousands of operations. Another difference is that electric breakers are used with relatively higher currents. 

Components of Circuit Breaker

A circuit breaker system is composed of three parts. These three components are the sensing system, relay, and the combination of contacts and the contact actuator. A sensing system is responsible for detecting an overload situation, while a relay is responsible for transferring the information to the switching arrangement, and the combination of contacts and the contact actuator. This electric arrangement is usually observed in power transmission and distribution networks dealing with very high currents, voltages, and powers. 

Circuit Breakers Calculation in Solar Panel Systems

When connecting circuit breakers to the PV system, you have to follow the recommended calculations to avoid future problems and damage to the entire system. The recommendations for using overcurrent protection devices including circuit breakers in solar modules against overloading conditions are given in IEC 60269-6 (volume 6 of IEC 60269-6) and also UL 248-19. 

For circuit breakers, IEC recommends a 20% and 25% margin in voltage and overload current. Most of the time, the ratings are specified by the solar manufacturers at given ambient conditions. If the temperatures exceed this given value, derating must be applied according to the manufacturer’s specifications. 

When it comes to breaker sizes for solar panels, NEC requires the breakers to be sized at 125% of the inverter’s rated output. So a 7680W inverter that outputs 240V, outputs 32A (7680W ÷ 240V = 32A). That requires a 40A breaker (32A x 125% = 40A).

Final Thoughts

If you owned a solar panel system at home,  you have to understand how circuit breakers work to prevent catching fires at home. These devices are one of the major components of the PV solar system as they protect the system wiring from getting too hot and accidentally catch fire if short circuits occurred. Thus, understanding the breaker itself and its proper calculations in the PV system should be done.