A precise sensor in the battery’s negative cable that measures every amp in and out, so the monitor shows a true state of charge — like an accurate fuel gauge for your battery.
Voltage alone is a poor fuel gauge for lithium. A shunt measures every amp in and out, so your monitor can show a true state of charge instead of guessing.
It sits in the main negative line between the battery and the negative busbar, with the battery monitor reading from it.
Design your van, boat, cabin or RV system in Wattonomy and it places the monitor shunt in the battery negative and lists the matching monitor in the build pack — from the appliances you actually run, sized to the recognized standard for your region. You see it on the wiring diagram, in the sized parts list, and in a plain-English build pack that explains the reasoning behind every choice. No account, no email — about a minute to a complete, validated design.
It is a precise sensor in the negative cable that measures current flow, letting the monitor count every amp in and out for an accurate state of charge.
In the main negative between the battery bank and the negative busbar, so all current passes through it and nothing bypasses the count.
It takes about a minute. No account, no email.