The backbone

    When we use the word backbone, we mean the following parts of the system:
  • The main power supply
  • The cabinets where users can connect to
  • The wiring between cabinets
  • The server that collects the data
Schematic representation of the 400V part connected to the backbone

The main power supply is at the center of the grid, providing basic energy to all endpoints. There are six (almost) 3kW power supplies wired in parallel. They need about 230V/16A each, so a 400V/32A connection is sufficient for the six of them. If we cannot find a “green” 400V solution we will power it directly using one of the diesel generators.

At the center point a few larger energy projects can be connected to the grid. Larger means anything thats provides or needs 32 Amps or more at DC grid Voltage (42V +/- 15%).

The six cabinets at the endpoints of the hexagon shaped grid are meant for smaller projects, villages and single users. There are a lot of 16A and 4A connections available in these cabinets. There is no possibility to connect larger projects here. Peak power is allowed to be quite a bit higher. The circuit breakers are DC rated C curve types. Doubling the current for a few seconds does not trip the breakers.

The cabling between the cabinets is standard 6mm2 or 10mm2 copper with five conductors. One conductor for earth, two for negative and two for positive DC. Each of the negative or positive wires is protected on both sides of the cable by a 32A circuit breaker. This way we can assure breakers trip magnetically when two conductors are shorted. The breakers will trip thermally if a cable gets overloaded for a prolonged time. The cables are all the same in length.

The server will log all power data during the event. No end-user data is logged unless users record and send in their own live data. We will provide you with details how to submit data. We maybe can build some API’s and a fancy dashboard so we can make things smart and look nice.