Answer:

DC distributions from Ferroamp are used to connect cables from the various components in the DC network to ultimately have only one DC cable connected to the EnergyHub. The DC distributions come in three different sizes with the ability to connect and interconnect 5, 8, or 15SSO:s / batteries.

The DC distribution consists of 1, 2, or 3 rows with fuse pairs for each component connected (+ and -). The fuse pairs consist of 1000 V / 15 A DC fuses and fuse holders that can accommodate DC fuses for up to 1000 V and 32 A. Additionally, there is a 63 A DC breaker on each row, meaning you cannot connect more than 63 A per row.

The limitations you must adhere to are as follows:

• The number of fuse pairs in the DC distribution
• The number of rows
• Size of fuses in the fuse pairs (15 A included, can be extended up to 32 A maximum)
• Maximum power from the components connected on one row must not exceed a power equivalent to a current over 63 A

Examples:

Here are some examples showing how to think when choosing DC distribution.

Example 1: Installation with 4 PV modules

1. We are going to connect 4 components together and therefore need to utilize 4 fuse pairs in our DC distribution.
2. The maximum current output from the PV modules is 12.5 A so we can use the 15 A fuses pre-installed in the DC distribution.
3. 4 SSO:s times 12.5 A gives us a maximum current per row of 50 A so we are below 63 A per row.
4. Based on this, we can choose a DC distribution 5.

Example 2: Installation with 6 PV modules and 2 ESS battery systems 14.8 kWh / 8 kW

1. In this case, we will connect 8 components together and therefore need to utilize 8 fuse pairs in our DC distribution.
2. The maximum current output from the SSO is 12.5 A, so we can use the 15 A fuses pre-installed in the DC distribution. The maximum current output from the ESS battery is also 12.5 A, so in this case, we can also use the 15 A fuses pre-installed in the DC distribution.
3. 63 A divided by 12.5 A equals 5.04 and therefore, we can connect a maximum of 5 components per row to keep ourselves under 63 A.
4. We can then choose DC distribution 8 which has 4 fuse pairs per row.

Example 3: Installation with 7 PV modules and 1 Pylontech 25.9 kWh / 24 kW

1. In this case, we will connect 8 components together and therefore need to utilize 8 fuse pairs in our DC distribution.
2. The maximum current output from the SSO is 12.5 A, so we can use the 15 A fuses pre-installed in the DC distribution. The maximum current output from the Pylontech battery is 31.6 A, so in this case, we will need to replace the 15 A fuses pre-installed in the DC distribution with 32 A fuses.
3. Due to the maximum current output from the Pylontech battery being 31.6 A, we can only connect an additional 2 SSO:s on the same row to keep ourselves under 63 A (31.6 A + 12.5 A + 12.5 A = 56.6 A).
4. This means that we will need a DC distribution board where we have access to three rows and can thus keep the maximum current per row under 63 A. 

If the installation has more than 15 SSO:s / batteries in the system or a battery with a maximum power equivalent to a current of over 32 A, or for any other reason requires more than 1 DC distribution, these will in turn need to be connected and interconnected in a larger DC distribution cabinet with larger fuse sizes and DC breakers. 

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