question

ehsab avatar image

Is the VE.Bus connection isolated on the Quattro?

Hi,

I just read Wiring Unlimited (what a good read it is) and while reading 4.5 "Switching the negative in multiple unit systems" i remembered a blog post from late 2016 (https://www.victronenergy.com/blog/2016/12/29/erm-energies-solar-powered-containerised-system/) where it seems like they have MCBs on both + and - just before the Quattros.

Is the VE.Bus isolated on the Quattros, or is the system in the blogpost just not installed correctly?

I believe this information should be added to the ESS Manual, i couldn't find anything about isolation in there.

Also, i have a vague memory that i have seen a document that describes what parts/connectors on a unit that is isolated and what is not. But i can't seem to find it, any one know what document i mean?


Kind Regards

VE.Bus
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1 Answer
Guy Stewart (Victron Community Manager) avatar image

Hi @ehsab,

Good spotting!

VE.Bus is not isolated on the MultiPlus range and Quattros.

Therefore it is very important to prevent damage to the communications cards that the negative of a Quattro remains continuous between units as long as the VE.Bus cable that connects the multiple units is connected.

I don't have any insight for that installation, but if units need to be isolated at both poles, or local wiring requirements demand double pole isolation for each unit, the communications cables must be removed first AND appropriate safety signage needs to clearly explain this.

Double pole isolation of the system is allowed (and sometimes required), as long as it at the battery connection end of the DC bus, and the Quattros remain with continuous negative between themselves.

Thank you for the suggestion, I will add this to the parallel and three phase VE.Bus systems manual.

There was a Victron isolation document written by Victron founder, Reinout Vader. Margreet consulted with Reinout when writing her book and the most relevant sections have been included. That should be used as the reference now, and expanded as necessary.

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