On 6/10/2021 9:32 AM, Karl wrote:
> That's a hidden anti-theft switch to disable the entire battery system
> ... The ground cable: ... I routed the
> ground cable over to the other side to combine with the ground of that
> battery, both of which then routed to a shunt for the Victron battery
> monitor.

Thanks for explaining!

I have a ammeter shunt on my house battery.  Months ago I got into a
discussion with a longtime aviation electronics buddy who now uses hall
effect devices to sense current, and I'd like to switch to that, but I
want to sense lots of current paths and log the data, just out of curiosity.

So I started thinking about designing a module based around a hall
effect device, so I can stick a bunch of them in various places in the
wiring.  But I haven't done any actual work on that yet.

By the way, for measuring large currents, by aviation buddy takes an
interesting approach: He inserts a relatively short stretch of two
parallel wires, one to carry the bulk of the current, and a smaller
parallel wire which ends up carrying a fraction of the current,
determined on the ratio of the wires' cross sections.  He runs the
smaller wire through the coil of an integrated hall effect module and
calibrates the reading in software.  He's using that technique with good
success.  I want to experiment with that, but, again, I haven't actually
started.

Here's house battery/ammeter shunt installation, changed little since I
did it ten years ago.  My wiring isn't as neat as Karl's!

https://sbw.org/westybattery/