The Victron SmartShunt IP65 and the standard IP21 SmartShunt measure your battery the same way. Victron’s two datasheets list the same accuracy, the same power draw and the same app. The main difference is the housing. Here’s what’s identical, what changes and which one makes sense for your build.
Victron SmartShunt IP65 vs IP21: Specs
| SmartShunt (IP21) | SmartShunt IP65 | |
|---|---|---|
| Sizes | 300A, 500A, 1000A, 2000A | 300A, 500A, 1000A, 2000A |
| Supply voltage | 6.5–70V DC | 6.5–70V DC |
| Current draw | <1mA | <1mA |
| Current resolution | ±0.01A | ±0.01A |
| Current accuracy | ±0.4% | ±0.4% |
| Protection | IP21 | IP65, waterproof |
| Bluetooth + VE.Direct | Yes | Yes |
| Aux input | Starter battery, midpoint or temperature | Same |
| Operating temp | -40 to +50°C | -40 to +50°C |
Sources: Victron SmartShunt and SmartShunt IP65 datasheets.
Both come with two cables with a 1A fuse for the “+” connection. The IP65 datasheet specifies them as 1.5m cables.
What Stays the Same
Both shunts give you state of charge, time-to-go, voltage, current and history in VictronConnect. Both connect to a Cerbo GX over VE.Direct for VRM monitoring. Both can share battery voltage, current and temperature with SmartSolar chargers and Orion chargers over VE.Smart Networking. The auxiliary input on both can monitor a starter battery, the midpoint of a series bank, or battery temperature with the optional sensor.
Where the IP65 Version Belongs
- Boat bilges and lockers where spray or condensation is likely.
- Under-vehicle or chassis battery boxes on overlanders and trailers.
- Outdoor cabinets and other places with dust or water.
Where the IP21 Version Is Fine
- Inside RVs, vans and cabins, in a dry electrical bay.
- Lynx or busbar setups in a closed compartment.
An IP21 rating protects against solid objects 12.5mm and larger and against vertically dripping water. It doesn’t protect against jets or immersion.
Prices We Confirmed
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We checked these listings live: the Victron SmartShunt 500A and the Victron SmartShunt IP65. Prices change, so check the listing before you buy.
Verdict
Buy the IP65 for anywhere wet, dusty or outdoors. Buy the IP21 for a dry indoor install. You get the same monitor and the same data either way.
Want the source figures? The SmartShunt page on Victron’s site has the datasheet.
What the IP Ratings Actually Mean
The two digits in an IP rating describe protection against solids and against water.
| Rating | Solids (first digit) | Water (second digit) |
|---|---|---|
| IP21 | Objects 12.5mm and larger, such as fingers | Vertically dripping water |
| IP65 | Dust-tight | Low-pressure water jets from any direction |
So the IP65 version handles a hose-down or road spray, while the IP21 needs a dry, sheltered compartment.
Worked Example: Three Real Locations
| Install spot | Typical exposure | Pick |
|---|---|---|
| Under the bed in a van, next to the battery | Dry, enclosed | IP21 |
| Battery box on a trailer tongue | Road spray, dust, rain | IP65 |
| Sailboat battery locker under a cockpit seat | Condensation, occasional splash | IP65 |
| Dry closet in an off-grid cabin | Dry | IP21 |
| Overland truck with a battery under the tray | Dust and mud | IP65 |
Worked Example: Midpoint Monitoring
The auxiliary input can watch the midpoint of a series bank. Say you have two 12V lead-acid batteries wired in series for 24V. Each battery should sit at about half the bank voltage. If the bank reads 25.6V, the midpoint should read close to 12.8V. A growing deviation from that halfway point shows one battery is drifting from the other, so you can rebalance or check it early. Example values. This works the same on both versions.
Using the Temperature Input
With Victron’s temperature sensor on the aux input, the shunt reports battery temperature. Over VE.Smart Networking, SmartSolar and Orion chargers can use that reading for temperature-compensated charging of lead-acid batteries, and for low-temperature charge protection on lithium where the charger supports it.
Cable Routing Tips for the IP65
- The IP65 datasheet lists 1.5m cables with a 1A fuse for the + connection, so plan the mounting spot within that reach of the battery positive.
- Seal any holes where cables pass into a battery box with glands or grommets so the box itself stays dry.
- Keep the shunt’s Bluetooth range in mind. A metal battery box can weaken the signal, so check you can still connect before closing it up.
What You’ll See After Install
Once connected, both versions show the same data in VictronConnect:
- State of charge as a percentage and time-to-go at the current draw
- Battery voltage, current and power, with charge shown as positive and discharge as negative
- History: deepest discharge, average discharge, cycle count and total Ah drawn
- Alarms you can set for low voltage, high voltage or low state of charge
The first full charge synchronises the state of charge, so give the battery a complete charge after installing either version.
Choosing the Size, Same for Both
Choose the current rating from your biggest continuous load. Both versions come in 300A, 500A, 1000A and 2000A. For most vans and small boats, 500A gives comfortable headroom.
FAQ
Is the Victron SmartShunt IP65 more accurate?
No. Both list ±0.4% current accuracy.
Can I mount the IP21 version outdoors in an enclosure?
Only inside a sealed, dry enclosure. Otherwise, choose the IP65.
Does the IP65 version work with a Cerbo GX?
Yes. It has the same VE.Direct port, so it shows on a GX device and VRM.
Can I use the IP65 inside a dry van too?
Yes. It works anywhere the IP21 does; you’re paying for protection you may not need.
Do the two versions show differently in VictronConnect?
No. Both show the same screens: state of charge, time-to-go, history and settings.
Is the IP65 version harder to install?
No. The wiring is the same: battery negative to one side of the shunt, everything else to the other, and the fused + lead to the battery positive.
Sources: Victron SmartShunt and SmartShunt IP65 datasheets; SmartShunt product page, victronenergy.com, accessed Oct 2026.
Related: LiTime 12V 50Ah LiFePO4 Battery Review, EcoFlow Delta 3 Max Van Life Leisure Battery, EcoFlow Delta 3 Max RV Boondocking, plus the Victron Energy Guide