Which cable should I use in the DC network between an SSO and DC distribution?

*NOTE: The information below is directed towards installers. Only trained electricians are allowed to install Ferroamp’s products.  

Answer:

A solar string optimizer connects to the EnergyHub system through a DC distribution. The cable used must have at least three conductors, with one of the conductors used for ground (PE). The DC voltage network in the EnergyHub system has a nominal voltage of 760V, with a maximum of 800V. Therefore, the selected cable must withstand at least this voltage. Common power cables with a rated voltage of 0.6/1kV or higher are recommended for use.

Cables between the EnergyHub and SSO should be sized so that the total voltage drop does not exceed 2%.

Contact Ferroamp for sizing PowerShare installations as other considerations may need to be taken into account for voltage drop in the DC voltage network.

Examples:

Examples of cables which can be used: 

• Nexans: FXQ Easy, SE-N1XE

• Draka: ACEflex, ACEflex Pure, SE-N1XE

Below is a table with examples of cable sizes needed for different cable lengths. The example is based on a maximum 1% voltage drop between the SSO and DC distribution, leaving a 1% margin for the cable between the DC distribution and EnergyHub. 

Tools: 
More detailed calculations for other lengths and installation methods can be done using Ferroamp's cable calculator here. 

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