question

cdoyle avatar image
cdoyle asked

3 Phase Multiplus II install, With Solar

Hi, We have a 30kw 3 Phase grid connected Solar PV installation we have just installed, where client wants to add battery storage and back up in the event of mains failure, we have used other brands in the past within our electrical and Solar Business, but client has request Victron kit, which we have little experience of on three phase installs, only single phase.

Have done most of the online training and videos, We are proposing to install 3no Multiplus 48/5000 units, 1no Lynx Power in for batteries, 1no GX display, 1no ET340 to monitor the Solar PV, 1no EM24 with CTs to monitor the 3 phase load, and 10no 3.5kw Pylontech batteries.

The issue we have is there are no stock anywhere of the EM24's (made by CarloGavazzi) anywhere that can monitor the 100amp 3 phase AC supply, the replacements are not out until March 2023 at the earliest, is there another option available or can this be done via a direct connected CT to each of the Multiplus units,


Thanks in advance

Cavin



multiplus in parallel
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3 Answers
Kevin Windrem avatar image
Kevin Windrem answered ·

The Multiplus II line has a plug-in current transformer intended to measure grid current ahead of a AC input side PV array.

If you want a system that will allow the solar to charge the batteries during a grid failure, you'd need to connect the PV inverter to the output side of the Multi. Some PV inverters like Fronius integrate with the Cerbo GX and provide it with PV production power so additional energy monitors would not be required. However, you need inverter power equivalent to your PV production to avoid over voltage shutdowns when a heavy load suddenly switches off. So you'd need 3 10KVA Quattros (or Multis II).

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cdoyle avatar image
cdoyle answered ·

Many thanks Kevin

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

cdoyle avatar image
cdoyle answered ·

Many thanks Kevin

2 |3000

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