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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Answer 2 · 2023-11-05T19:44:59Z

momahmoud answered · Nov 05, 2023 at 07:44 PM

Link to our store

We have made enclosed 600A Battery Disconnect Switch to fit the Lynx DC Distribution systems M8, very helpful in Lynx installations.

MeadoTech Ltd United Kingdom

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jallis commented · Nov 26, 2023 at 09:44 PM

And the selling price for this switch is 470 pounds???

Is it made of *gold* or what?

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Answer 3 · 2023-11-23T21:57:56Z

os2dude answered · Nov 23, 2023 at 09:57 PM

If the system is in a boat, the American Yacht Builders Counsel (AYBC) requires an emergency main cutoff switch after the battery bank. I've noticed Van & RV systems tend to follow similar guidelines.

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Answer 4 · 2023-11-27T06:54:24Z

KämpingVan Conversions OÜ answered · Nov 27, 2023 at 06:54 AM

We usually add the main switch before the Lynx System along with the other cut-off switches in the diagram, but for mainly maintenance reasons. Just to make sure we can easily but certainly disconnect the batteries and the power if we are working on the system. Also for example if there is a need to change the MEGA fuses in the Lynx Distributor it is just a bit safer to disconnect the battery bank for a moment and change out the fuse.

Of course you have to keep in mind that most main switches are rated for around 300A, so if your system is larger, you need to source a better main switch.

BR,

KampingVan

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