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The small parts that make big systems work
Comms cables, fuses, programming tools, solar cabling, and sensors — the unglamorous 5% of the budget that decides whether the other 95% performs. Grouped by job below, with the panels themselves one click away.
Swipe the table sideways to see every column →
| Category | What's here | Best for | From |
|---|---|---|---|
| Solar panels (by brand) | |||
| All solar panels | Lumera, Sol-Go, SunPower & Victron | Rigid bifacial to flexible walkable — browse by brand | — |
| Communication & network cables | |||
| VE.Direct cables | 0.3–10m, straight & right-angle | MPPTs, BMVs, SmartShunts to GX devices | $17.85 |
| RJ45 UTP cables | 0.3–30m | VE.Bus & VE.Can runs between inverters, BMSes and GX | $7.65 |
| VE.Can to CAN-bus BMS cables | Type A & B | Connecting managed batteries to a GX device | $14.45 |
| VE.Can terminators | 120 Ω, bag of 2 | Both ends of every VE.Can network — the part everyone forgets | $10.20 |
| Programming & Bluetooth tools | |||
| MK3-USB interface | USB-A or USB-C | Configuring MultiPlus/Quattro from a laptop | $65.45 |
| VE.Bus Smart Dongle | Bluetooth | Adding app monitoring to an inverter/charger | $79.95 |
| VE.Direct Bluetooth dongle | Bluetooth | App access for non-Smart MPPTs and monitors | $39.95 |
| Fuses, solar cabling & sensors | |||
| MEGA fuses | 40–500A | Main battery and Lynx distribution protection | $15.30 |
| MIDI fuses | 30–200A | Branch circuits and device feeds | $4.25 |
| MC4 solar cables | PV-ST01 range | Panel-to-controller runs and array wiring | $9.35 |
| Temperature sensors | For Multis & GX | Temperature-compensated charging that batteries love | $20.40 |
Sixty-plus items live in this collection — use the filters above to narrow by type. Related: DC distribution & fuse holders and GX communication centers.
How to get the small parts right, in three questions
The right cable for the port, the right fuse for the wire, and the tools that make setup painless.
Which cable does my device speak?
Victron gear talks over three main ports: VE.Direct (MPPTs, battery monitors), VE.Bus (inverter/chargers), and VE.Can (GX networks, managed batteries) — the latter two both use RJ45 cables. Check the port name on your device, match the cable, and remember VE.Can wants a terminator at each end.
What fuse goes where?
The fuse protects the wire, so rating follows cable size and the device's datasheet — MEGA fuses guard main battery feeds, MIDI fuses cover branch circuits. Match the fuse's voltage rating to your system too (32V vs 58V matters on 48V banks). Unsure? Send us your wiring plan.
Phone or laptop for setup?
Bluetooth dongles put Smart-less devices in the VictronConnect app — great for monitoring and everyday settings. The MK3-USB unlocks the deeper inverter/charger configuration from a laptop. Many owners want both: the dongle for daily glances, the MK3 for commissioning day.
Why buy from Blue Marine
True Blue Victron distributor
Genuine parts, warranty support handled by us.
ABYC-certified advisors
Send us your system diagram — we'll list every cable and fuse it needs.
Free US shipping over $49
Fast shipping from Seattle and 60-day returns on non-lithium items.
Real people, real boats
Call (800) 628-6306 Mon–Sat.
Finishing an install and missing one part?
It's always one cable or one fuse. Send us your parts list or a photo of the install — we'll spot what's missing and get it on a truck from Seattle today.
Cables, fuses & accessories FAQ
VE.Direct, VE.Bus, VE.Can — which cable do I need?
Read the port label on your device. VE.Direct is the small flat connector on MPPTs and battery monitors. VE.Bus is the RJ45 network for inverter/chargers. VE.Can is the RJ45 network GX devices and managed batteries use — and it needs a 120 Ω terminator at each end of the chain. When in doubt, tell us the two devices you're connecting.
Can I use regular Ethernet cable for VE.Bus or VE.Can?
The connectors match, but we recommend proper UTP cables from the range here — correct pinout and quality straight from Victron, in lengths from 0.3 to 30 meters. On a boat, saving a few dollars on the nervous system of your power setup is rarely the win it looks like.
How do I pick a fuse size?
The fuse protects the wire, so it's sized to the cable and the device manufacturer's recommendation — every Victron datasheet lists one. Match the fuse voltage rating to your bank as well; a 32V fuse doesn't belong on a 48V system when a 58V version exists. We're happy to sanity-check your fusing plan.
What does the temperature sensor actually improve?
Charge voltage should shift with battery temperature — especially for lead-acid banks in engine rooms or cold lockers. The sensor feeds your charger or GX real numbers so charging compensates automatically. It's a twenty-dollar part that meaningfully extends battery life.
Where are the solar panels themselves?
One click away: Lumera bifacial, Sol-Go flexible & walkable, SunPower E-Flex, or the whole panel range — with MPPT controllers to match.