Interconnect 2 separate off grid Victron 3phase systems 100m apart

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hdp asked Nov 16, '21

Interconnect 2 separate off grid Victron 3phase systems 100m apart

I want to connect two existing systems together

System A:

3 x 15KVA Quattro

4 x 250/100 MPPT

2 x 30kWh Freedom Won Lithium

1 x 45KVA Generator

System B:

3 x 10KVA Quattro

2 x 250/100 MPPT

2 x 15kWh Freedom Won Lithium

1 x 30KVA Generator

These two system are 100m apart and I know they can complement each other with excess power by sharing it between each other via an AC cable acting as a 'grid'

Maybe connect output1 of system A to input1 of system B and vice versa. Then both generators to input 2 (separately per respective inverter)

offgrid 3 phase shorepower

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Mike Dorsett answered · Nov 16, 2021 at 05:48 PM

Whilst using the output from system A to the grid input of system B, you only need to set up system B to export excess power back to system A. You should NOT make a loop by trying to feed the grid of system A from the output of B.

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hdp commented · Nov 16, 2021 at 06:17 PM

Thanks Mike, It makes sense, then you also just need 1 cable

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hdp commented · Apr 07, 2022 at 02:44 PM

Would it be possible for system B to charge system A? (It will only feed back the output load)

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Modifications Space

Node Red Space

Answer 1 · 2022-04-07T15:08:58Z

hdp answered · Apr 07, 2022 at 03:08 PM

2 systems-Model.pdf

1649344103524.png (54.0 KiB)

2-systems-model.pdf (93.1 KiB)

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Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

hdp commented · Apr 07, 2022 at 03:10 PM

How could system B charge system A?

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tnt369 hdp commented · Apr 07, 2022 at 04:18 PM

For example, by a negative value for the grid setpoint at system B. I would lay a data line (network CAT6...) with the power line (attention because of the length and some distance because of interference). Then read in the values for load and state of charge from both systems with an external controller via Modbus. Use logic to calculate the grid setpoint of system B and transfer it to this system. This way, both batteries can be charged by only one generator (redundancy). In addition, the external controller could also serve as a display unit for the entire system.

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