question

pmve avatar image
pmve asked

Is it possible to add independent off grid 3 phase Network to existing On Grid 3 phase ESS

Hello,

soon I like to build the following system Setup:

6 Multiplus II 48/5000/70 combined to a Set of 2 per Phase

4 Smart Solar MPPT RS450/200 (44KWp connected Solarpower)

1 CERBO GX

120KWh 51.2V DC Battery System connected to Cerbo GX vie CAN

All build as one onGrid ESS 3-Phase System (2 MP II per Phase).

Now I wonder, if it is possible to connect an additional set of 3xMP II

to the CERBOS that should work as follows:

- no connection to the GRID (of grid)

- span its own independent 3-Phase Network

- connected to the Battery / DC-BUS of the existing System

- connected and controlled by the existing CERBO GX so this network can be shut down if Battery is low

Background of this idea:

A victron EV charging station will be connected at this independent 3-phase network. The charging station should not have any connection to the grid. Furthermore the EV charger should not take any capacity from the possible
main-load which is provided from the existing on grid set of 2x3MP II.
Since there is more possible power coming from the Smart Solar MPPTs as it can be "inverted" by the existing MPII set, I like to transfer these energy inside the cars instead of loosing it.

Many thanks in advance for your answers.

Paul


system design
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2 Answers
Michelle Konzack avatar image
Michelle Konzack answered ·

The CerboGX csn not control two different/independant Inverter Dystems directly.


What you can do is to use the Relais output of the CerboGX to control the Remote Control input of the three Multiplus.

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pmve avatar image
pmve answered ·

Does that mean, the second inverter system is not aware of the battery status accept the release signal via Relay? Also the EV charging station, connected to the second system, can not communicate to the Battery controlling CerboGX?

Is it possible to have a second CerboGX which communicates to the first one to get all relevant
information about available solar-power, battery state etc?

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