Grid Tie Inverter, Grid connected Inverter FRONIUS IG Central Inverter

The FRONIUS IG central inverter can be operated perfectly in PV systems from 24 kW upwards and also new system configurations. This grid connected inverter or grid tie inverter consists of several power stacks instead of one large power stack to convert the electricity that can be 9, 12 to 15 power stacks depending on the output class.

Because the power stacks operate in a higher partial-load area than one large power stack. This enables the energy to be converted much more efficiently. FRONIUS grid tie inverters operate with several small power stacks than able to switch on or off automatically according to solar irradiation. This means not all power stacks switch on, when solar irradiation increases, the other power stacks will switch on automatically to maximize the power output.

Up to 15 Plug-In Modules for More Power
The FRONIUS IG 400/500 inverters work with a completely new system configuration. The electricity is not just converted by a single power stack but it is the result of the shared work of the 12 or 15 printed circuit boards - depending on the output class. The reason: it is well known that the energy yield rises in the part-load areas if smaller power stacks are used. Every FRONIUS IG central inverter works thus with several smaller power stacks, according to the MIX-concept. This enables the inverter to deliver maximum power continuously.

Easy Installation due to Removable Racks
The power stacks of the FRONIUS IG central inverter are easily re-moved like racks (drawers). The only tool required is a screwdriver. There is a noticeable reduction in weight if the plug-in power stacks are taken out. This makes it easy to install.

Moreover, the FRONIUS IG central inverter's ingenious plug-in system is also suitable for particularly fast and uncomplicated maintenance: for example, if one power stack fails, this does not mean that the entire PV system shuts down, as it is usual with other central inverters. Instead, the remaining racks take over the work of the one that has failed. This is another important advantage of the MIX™ concept.

A partial failure of the inverter only lasts until a replacement rack arrives. This ensures that the system can continue to produce electricity and it keeps energy losses to a minimum level.

Optimum Climate Control due to Innovative Ventilation System
Fronius has found an intelligent solution regarding the optimum climate control: as for industrial plants, fresh cool air is taken from above and transported downwards through the power stacks. The warm discharged air is transported back to the outside by way of a pipe at the top. The room can also be used for other purposes due to the steady temperature. The most important thing is to assure that the inverter can work under optimum conditions.