SmartShunt 500A/50mV (IP21)
500 A/50 mV battery shunt with Bluetooth and a VE.Direct port, no display. Reads out through the VictronConnect app or a GX device; the aux input can monitor a second battery, midpoint or temperature.
This part has no feed of its own to size, so its cables are sized from the complete system topology once you draw what it connects to.
Wiring diagram
The drawing shows where the feed, the return and the fuse land on this part. The starter uses the same reference circuit and sizing assumptions. Read the installation notes for manufacturer requirements before adapting the runs.
House bank +
positive connection
10 mm² (8 AWG) · 25 A fuse
3 m one way · 18 A design
To 18 A load +
30 A charger +
positive connection
10 mm² (8 AWG) · 40 A fuse
3 m one way · 30 A design
To House bank +
House bank −
negative connection
10 mm² (8 AWG) · unfused return
30 cm one way · 48 A design
To SmartShunt 500 BATT −
SmartShunt 500 LOAD −
negative connection
10 mm² (8 AWG) · unfused return
30 cm one way · 30 A design
To − Bus −
18 A load −
negative connection
10 mm² (8 AWG) · unfused return
3 m one way · 18 A design
To − Bus 1
30 A charger −
negative connection
10 mm² (8 AWG) · unfused return
3 m one way · 30 A design
To − Bus 2
House bank +
signal connection
Supplied lead · 1 A slow-blow fuse
1.5 m one way
To SmartShunt 500 B+ sense
Example allowances · ABYC E-11 sizing · verify actual protection
The 12 V example includes a 200 Ah placeholder bank, an 18 A load allowance, a 30 A charging allowance and a system-negative bus. Both returns pass through the shunt. The short shunt links are 0.3 m each; the supplied fused Vbatt+ lead is represented separately. Power-cable sizes come from the connected example, not the shunt's 500 A measuring range. Select and locate actual battery protection before building. Manufacturer installation manual
Open starter in CrimpBuild it out
Open the canvas with SmartShunt 500A/50mV (IP21) already placed, then add your batteries, charging, distribution and loads around it.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
The catalog facts for this part, which terminal takes what, and the hardware you'll want around it. Check the nameplate on your own unit before you order.
This part has no rating of its own to list. What matters is its terminals — see the map beside.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
BATT − is BATTERY MINUS; LOAD − represents SYSTEM MINUS, labeled LOAD MINUS on older units. B+ sense represents Vbatt+, powered by the supplied 1 A fused lead. Aux and VE.Direct are not modeled. The 500 A rating is the measuring range, not a fuse recommendation.
BATT −
batt-neg
negative · input
LOAD −
load-neg
negative · output
B+ sense
vbat
signal · bidi
Field notes
What we've read and heard about installing this exact part. These are notes, kept apart from the numbers Crimp works out.
This is the SmartShunt 500A/50mV, IP21, with Bluetooth and VE.Direct. It is the dry-location model, not the separately available IP65 version. The 500 A marking describes its measuring range; it does not specify the battery fuse or the current your installation will draw. Check the SmartShunt technical data against your unit.
Connect the house-bank negative only to BATTERY MINUS. Put the system's negative bus, including every load and charging return, on SYSTEM MINUS. Older units call that stud LOAD MINUS. The 500 A model uses M10 shunt bolts, tightened to a maximum 21 Nm. Follow the basic connections in the manual.
The editable example includes a placeholder bank, separate charging and load allowances, and a negative bus. Its short bank-to-shunt and shunt-to-bus links carry the connected system's current. They are not a recommendation for a fully loaded 500 A installation. If you use a Lynx Distributor, its negative rail belongs on this same system side.
Yes: its electronics need the supplied red Vbatt+ lead with a 1 A slow-blow fuse, connected to battery positive. That small supply fuse does not protect the main battery cables. The example draws this lead separately and retains its supplied length; it does not calculate a replacement sense-wire size. Verify main protection with the LiFePO₄ fuse tool.
Aux can monitor a second battery's voltage, midpoint voltage or temperature with the appropriate wiring. Aux and VE.Direct are outside this example. Follow the manual before using either.
Trace every negative return: a load or charger connected directly to battery negative bypasses the measurement. Reversed shunt connections can reverse the displayed charge/discharge sign. Also check monitor configuration and state-of-charge synchronization; the manufacturer troubleshooting guide separates connection faults from settings issues.
For a battery upgrade, continue with the lead-acid to LiFePO₄ conversion guide and the Orion XS charging example. All charging returns must remain on the system side when you expand this starter.
The boat and campervan wiring examples provide starting circuits to extend with monitoring. Their returns must be rerouted through the shunt; monitoring is not already installed in those examples.
Verified against the manufacturer's documentation (rev. 19 — 08/2026), checked 2026-09-11. Manufacturer documentation →
Method & provenance
The manufacturer publishes some of these numbers and Crimp works out the rest. It's worth knowing which is which.
From the maker
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
It lands on the canvas already placed. Add what it connects to, and every run gets its wire and fuse as you draw.