Skrzynki przyłączeniowe stringów

Anschlusstechnik Stringbox


We build your box!


Our stringboxes provide a high level of safety even during the installation and ensure a clean and clear wiring of the PV modules on the roof or in the open field. Multiple strings often must be connected in parallel to transmit a suitable electric power at a reasonable system voltage to the inverter. The several strings are connected directly to the stringbox nearby the modules. Only two wires (plus and minus) connect the stringbox to the inverter.

Stringboxes from Q3 are individually manufactured according to your needs and vary in their features (type of housing, number of inputs and outputs, fuse/diode ...). Optionally we can build your box with (remotely accessible) DC circuit breakers, overvoltage protection (T1 + T2/T2), string current measurement, voltage measurement and data transmission. Hence for each PV system the right technology can be selected.



An overview of the most important features:

Our Connection Technology

Stringbox Simple

Cost-effective and light-weight string box with 2 up to 5 inputs for small crystalline modules and thin-film installations.

Stringbox Easy 3G

Compact and lightweight string box for small to medium-sized string combinations and thin-film systems of all types up to 18 inputs.

Easy Duo/Trio Channel

String box due to the electrically isolated PCBs which two oder three different MPP trackers or inverters can be operated with a single box.

Stringbox BIG

Generator connection box for large systems of the order of megawatts, openfield plants, large roofmounted systems, e.g. on factory buildings.


Customized AC Box for connecting up to 20 inverters project example REC Romania.


Further examples regarding our customized connection technology including pictures.

General information

What is a string box? Usage of fuses or diodes? What about monitoring, OVP, ...???