Design your Victron system
Two ways to plan: a guided wizard that sizes the system for you, or a drag-and-drop schematic builder to lay out your own design. Planning tool only — MESSX confirms final models, wire/fuse sizing, and code compliance.
Your requirements
Recommended system
Starting parts list
| Qty | Component |
|---|
Estimates based on Victron sizing rules and a ~5.1 kWh LiFePO4 module. Wire/fuse sizing assumes a short (~10 ft) battery-to-inverter run; confirm the full design with MESSX.
Turn on Connect, then click two parts to wire them.
Scroll to zoom · drag the empty canvas to pan · click 100% to reset
Parts on canvas
| Qty | Component | Price |
|---|
Wiring schedule — DC runs use a positive (red) + negative (black) pair; AC runs use a 4-conductor cable (L1/L2/N/G) sized at 240V. Click a wire to set its length.
| Connection | Type | Run length | Current | Cable | Fuse |
|---|
Battery Bank Builder
Planning aid only. Cable and fuse sizing depend on your actual loads — use the Wire & fuse tab and confirm the final design with MESSX.
DC-DC Charge Time Calculator
Planning aid only — confirm alternator headroom, fuse and cable sizing with MESSX before install.
Shore Power Charge Calculator
Assumes ~90% charger efficiency; lithium tapers less than lead-acid. Actual times vary with temperature, BMS limits and charge profile. Confirm with MESSX.
Solar Array & MPPT Calculator
Assumes 75% solar derating (panel angle, temperature & partial shading) and ~14.4V charge voltage. Cold-weather Voc margin is +15%. Actual results vary with location, season and weather. Confirm with MESSX.
Edit ports
Add, remove or reorder terminals on each side. Drag the grip (⋮⋮) to reorder a port or move it to another side. Set the type, an optional custom label, and the connector.
Label & appearance
Choose where the label sits relative to the component.
Keyboard shortcuts
Wire & Cable Size Calculator
Fuse Size Calculator
Inverter Sizing Calculator
Power Consumption Calculator
AWG ↔ mm² Converter
- AWG uses a reverse scale — a smaller number means a thicker cable. Common on US brands (Renogy, Battle Born, Victron USA).
- mm² is the actual cross-sectional area — larger means thicker. Used by EU/UK brands (Victron Energy, Sterling Power).
- AWG sizes don't map exactly to standard metric sizes — the nearest standard mm² is shown, rounded up for safety where needed.
Battery State of Charge Lookup
Set up custom component
Pick what kind of component this is so wire sizing, ports and properties know how to treat it.
Zone
Wire
Circuit details
Recommended sizing
Estimates use 75°C copper ampacity, a 125% continuous-load factor, and the next standard fuse size. Always confirm derating, terminations, and code requirements with MESSX before installing.