Main battery switch before Lynx distribution system?

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sweyn asked Jun 10, '22

Main battery switch before Lynx distribution system?

I notice in the various Victron produced circuit diagrams for the Lynx system, they never put a main system switch before the Lynx distribution system/Lynx Smart BMS, however most actual people building seem to fit a physical switch between the battery and the Lynx.

Is there a reason why I should fit a physical switch?

I’m assuming people don’t like relying on the software controlled contactor In the Lynx Smart BMS?

Is this just aversion to change, or is there a good reason such as a regulatory requirment?

lynx distributor switch virtual switch

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Stefanie (Victron Energy Staff) answered · Jun 10, 2022 at 04:55 PM

Hi @Sweyn again,

The Lynx Smart BMS has a remote on/off port to which you can connect a simple physical switch (as opposed to a soft switch via VictronConnect or a GX device) and then use it as the main system switch. The only drawback is that it still draws power, albeit at a negligible rate of about 0.50 mA.

If you don't want that, or want to isolate the batteries from the rest of the system, then use a system main switch on the battery side (note the current rating). That's how I did it in one of my systems.

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Answer 1 · 2022-06-10T17:28:52Z

sweyn answered · Jun 10, 2022 at 05:28 PM

Thank you Stefanie, again very helpful!

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