Technology Overview

Femtogrid is a smart DC grid. It is a 3-wire, soft, a-symmetrical, 380 Vdc, isolated, bi-directional, self-stabilizing, decentralized network designed to distribute DC power and data.The Femtogrid, typically 380 Vdc, is not intended to to be used in a datacentre only, but in the built environment, where people plug their computers, lighting, refrigerators in a DC outlet. Where people have modules, small wind turbines or other sustainable generators and plug it in. Also storage (like small batteries) is easily added to the Femtogrid.




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A patented safety wire concept keeps the user free of arcs, electrical shocks, fire, balancing issues, decreases standby power and provides high speed Internet out of your wall outlet. This unique DC grid, the Femtogrid, saves integral 30-50% of the energy consumption at home, small and medium enterprises and buildings. AC grid connected or as an autarkic grid. In 2012 we transported, converted and inverted more than 500 MWh of DC energy with our grid and transported terabytes of data. Femtogrid, the smart DC, sustainable energy grid.The unique and patented parallel Femtogrid architecture builds on 4 mutual reinforcing smart components: 1) Solar Power Optimizers (DC/DC converters), which perform Maximum Power Point Tracking (MPPT) and voltage management per module, 2) safe, reliable and plug & play DC cables, 3) a robust inverter, which performs DC to AC inversion, and 4) a web-based portal for module level monitoring and problem-free service. The Femtogrid solution builds on the following technological advancements.

 


 

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Parallel Architecture

In contrast to traditional solar Femtogrid uses a parallel instead of a serial architecture for solar panels. Parallel power optimizers ensure the parallel architecture and are used as an add-on by the installer to each solar panel. The parallel architecture is plug & play: the solar panel is connected to the power optimizer, which connects the solar panel in parallel to the inverter.

 

3-wire cables

Femtogrid DC cables have 3 wires:  hot (red), cold (blue) and safety (black), whilst standard solar DC cables used by traditional solar have 2 wires: plus (red) and minus (blue). The extra third wire gives Femtogrid the edge to control every single module in the system, as the hot wire is switched off by the safety wire. This makes Femtogrid the safest system.

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