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Inverters

Grid-Tie Inverters

Often referred to as the “brains” of a renewable energy system, an inverter is an electronic device that converts direct current (DC) from solar modules into alternating current (AC) at the voltage and frequency required to run electrical loads or feed into the grid. Due to the high voltages involved, grid-tie inverters should be installed and serviced only by certified electricians.

Most grid-tie inverters are called “string” inverters because the PV modules must be wired together in series to obtain a higher input voltage. String Inverters are designed to run at voltages up to 600 VDC in residential systems and up to 1,000 VDC for commercial and industrial systems. String wiring is quick and easy to install, and the higher voltage helps to minimize line losses and required wire size. However, in string wiring, maximum power point tracking (MPPT), along with any monitoring output, is performed at the string or array level.

An important trend to note is that most string inverter manufacturers have introduced Transformerless (aka non-isolated) inverters due to the higher efficiency and lower manufacturing costs of that topology. Transformerless inverters have dominated the European market and are considered safer than their earlier counterparts.

Inverters come in either Single Phase or Three Phase. Single Phase inverters are generally used for domestic PV systems, whereas three phase systems are used in commercial outlets where the electricity supply comes into the premises as three phases.

Module Optimisers

Module Optimisers can be deployed behind each module to provide individual module-level MPPT tracking and monitoring, optimizing the DC output that is connected to a string inverter for very high efficiency. Systems that combine optimisers with low-cost high-efficiency string inverters can simplify system design and maximize safety and energy harvest with minimal impact on cost.

Inverters

Inverters

Grid-Tie Inverters

Often referred to as the “brains” of a renewable energy system, an inverter is an electronic device that converts direct current (DC) from solar modules into alternating current (AC) at the voltage and frequency required to run electrical loads or feed into the grid. Due to the high voltages involved, grid-tie inverters should be installed and serviced only by certified electricians.

Most grid-tie inverters are called “string” inverters because the PV modules must be wired together in series to obtain a higher input voltage. String Inverters are designed to run at voltages up to 600 VDC in residential systems and up to 1,000 VDC for commercial and industrial systems. String wiring is quick and easy to install, and the higher voltage helps to minimize line losses and required wire size. However, in string wiring, maximum power point tracking (MPPT), along with any monitoring output, is performed at the string or array level.

An important trend to note is that most string inverter manufacturers have introduced Transformerless (aka non-isolated) inverters due to the higher efficiency and lower manufacturing costs of that topology. Transformerless inverters have dominated the European market and are considered safer than their earlier counterparts.

Inverters come in either Single Phase or Three Phase. Single Phase inverters are generally used for domestic PV systems, whereas three phase systems are used in commercial outlets where the electricity supply comes into the premises as three phases.

Module Optimisers

Module Optimisers can be deployed behind each module to provide individual module-level MPPT tracking and monitoring, optimizing the DC output that is connected to a string inverter for very high efficiency. Systems that combine optimisers with low-cost high-efficiency string inverters can simplify system design and maximize safety and energy harvest with minimal impact on cost.

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