The MK3-USB is a communication interface that lets you connect compatible Victron inverters and inverter/chargers to a computer for configuration and firmware updates. It's built for installers and owners who need to program or update Victron gear directly, not for end users managing daily battery monitoring.
The MK3-USB is a Victron-specific programming and firmware interface, not a standalone inverter, battery, or monitoring node with its own electrical listings. It carries no AC output, DC battery voltage, or PV input specification because it is a data-communication accessory, not a power-handling device. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Critical Interconnection Requirements
- Function: VE.Bus-to-USB communication interface for configuration and firmware updates only.
- Compatible with: Multi, MultiGrid, MultiPlus, MultiPlus-II, Quattro, VE.Bus BMS V2, ECOmulti, EasySolar, EasyPlus, and any inverter with a VE.Bus communication port.
- NOT an inverter, charger, or battery monitor — it carries no AC output rating, no DC battery voltage rating, and no PV input rating.
- NOT compatible with non-Victron inverters or any device lacking a VE.Bus communication port.
- NOT rated for grid interconnection, sell-back, or utility-facing monitoring functions.
Field techs sometimes lose VE.Bus communication mid-firmware-update when a laptop's USB port drops power momentarily during a Windows update or sleep cycle — this can leave a Victron unit in a corrupted config state requiring a factory reset. Always disable USB selective suspend and sleep/hibernate on the laptop before starting a firmware push, and keep the MK3-USB plugged into a powered USB hub rather than a bus-powered port on long cable runs. Verify a clean serial handshake with VictronConnect or VEConfigure before disconnecting, and confirm the VE.Bus cable run length and termination match Victron's documented VE.Bus network guidelines — this keeps you compliant with the inverter manufacturer's commissioning documentation referenced under NEC Article 690/705 system documentation requirements for inspectors.
Key Benefits
- Direct VE.Bus-to-USB connection for firmware and configuration work on supported Victron products.
- Supports commissioning and settings updates across Multi, MultiPlus, MultiPlus-II, and Quattro product lines.
- Works with VE.Bus BMS V2 for battery-management configuration tasks.
- Enables Inverter/Charger settings adjustments in ECOmulti, EasySolar, and EasyPlus systems.
| Spec | Value | Unit |
|---|---|---|
| Model | ASS030140000 | - |
| SKU | CNT083 | - |
| Compatible Products | Multi, MultiGrid, MultiPlus, MultiPlus-II, Quattro, VE.Bus BMS V2, ECOmulti, EasySolar, EasyPlus, VE.Bus-equipped inverters | - |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with Victron Multi, MultiGrid, MultiPlus, MultiPlus-II, and Quattro inverter/chargers.
- Compatible with VE.Bus BMS V2 for battery-management-system configuration.
- Compatible with Inverter/Charger settings in ECOmulti, EasySolar, and EasyPlus product lines.
- Compatible with any inverter equipped with a VE.Bus communication port.
- NOT compatible with inverters or chargers that lack a VE.Bus communication port.
- NOT a battery charger, inverter, or grid-monitoring device — it performs no power conversion or grid measurement function.
| Category | Detail |
|---|---|
| Device Type | Communication/configuration interface accessory |
| Electrical Listings | [NEEDS VERIFICATION] |
| NEMA Enclosure Rating | [NEEDS VERIFICATION] |
FAQ
Q: What does the Victron MK3-USB do?
A: It connects compatible Victron products to a computer for configuration and firmware updates via the VE.Bus communication port.
Q: Which Victron products is the MK3-USB compatible with?
A: It works with Multi, MultiGrid, MultiPlus, MultiPlus-II, Quattro, VE.Bus BMS V2, and Inverter/Charger settings in ECOmulti, EasySolar, EasyPlus, and other inverters with a VE.Bus communication port.
Q: Does the MK3-USB monitor battery state of charge or grid power?
A: No. It is a configuration and firmware-update interface, not a battery or grid monitoring device.
Q: Can the MK3-USB be used with non-Victron inverters?
A: No. It is designed for Victron products with a VE.Bus communication port and is not compatible with inverters lacking that port.
Warranty & Registration
Manufacturer warranty terms for the MK3-USB were not included in the provided data. Refer to the "Resources (System Manuals and Warranty)" Tab above for manufacturer warranty documentation and registration details. Contact MSSD if you need help locating the correct paperwork before you order — we always reply back.
