question

hdp avatar image
hdp asked

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)

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2 Answers
Mike Dorsett avatar image
Mike Dorsett answered ·

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 avatar image hdp commented ·
Thanks Mike, It makes sense, then you also just need 1 cable
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hdp avatar image hdp commented ·

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

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hdp answered ·

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2-systems-model.pdf (93.1 KiB)
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hdp avatar image hdp commented ·
How could system B charge system A?
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tnt369 avatar image tnt369 hdp commented ·

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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