Wie talked about grounding battery negative. We did not talk about grounding the battery case. See the grounding diagram with the Victron recommendation.
And what to do with the metal cases?
These can be touched the battery negative not (plastic cover).
So in mine opinion the casings must be grounded, but also grounding the battery negative can be dangerous in a very unlikely isolation failure of one cell.
I real like Victron inverters, but hate the lack of information.
In the past I designed prototypes how need to confirm medical body floating (BF) an cardiac floating (CF) current leakages, so I’m not a complete idiot.
Every time you ask technical details about how to connect AC or DC side the answer is contact a qualified individual.
Serious, with mine background I understand all insulation problems and know the issues at AC when going off grid.
So once again, should I ground battery negative or not (I’m located in the Netherlands).
The battery casings are grounded and Isolation between battery and ground is real high.
The common voltage between grounded case and battery minus seems to be around 19V, dropping at the moment I measure (mine fluke meter has 10Mohm internal resistor).
But why is this around 19V, is there something inside the Multiplus II preventing high (potential harmful) voltage differences?
This serves as a general overview regarding the diverse nature of system type, location, and user requirements, and why a single, definitive answer is often unattainable.
Each unique scenario presents its own set of variables, encompassing specific operational environments, geographical considerations, and the individual needs and preferences of the end-users. These factors collectively influence the optimal solutions and configurations, making a universal recommendation impractical.
Therefore, it is essential to thoroughly evaluate your specific context, analyze the details provided, and make an informed decision based on your unique circumstances.
Have a read of this below (written for USA location but still worth a read) and decide for yourself.
As with any equipment, always follow the manufacturer’s recommendations.
Grounding Made simpler - Part 2: Stationary Systems | DIY Solar Power Forum
Good luck.
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