Complete repair guide for the Jayco Melbourne – 12V Lithium Battery Bank & Solar Upgrade. Follow these steps to diagnose and fix the issue yourself.
Parts & Tools You’ll Need
- 100Ah LiFePO4 drop-in lithium battery
- Victron SmartSolar MPPT charge controller
- Victron BMV-712 battery monitor
- 40A DC-DC battery-to-battery charger
- 200W flexible solar panel
- ANL fuse holder + 200A fuse
- 4/0 AWG welding cable (battery interconnect)
- Bus bar / power distribution terminal block
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Step-by-Step Repair Guide
Step 1: Diagnose Electrical System & Safety
Before beginning any work, you’ll need to disconnect the negative terminal of your existing lead-acid battery and wait 15 minutes for all systems to discharge. Visually inspect your battery compartment for corrosion, damaged wiring, and adequate ventilation—lithium batteries require proper airflow to prevent thermal issues during charging cycles.
Step 2: Install Battery Monitor & Shunt
You should mount the Victron BMV-712 display in an easily accessible location inside your van, then install the shunt in series with your battery’s negative terminal using the supplied 4/0 AWG cable. This monitoring system will give you real-time data on voltage, current, and state of charge throughout your system.
Step 3: Mount Solar Panel & Controller
You’ll need to secure the 200W flexible solar panel to your van’s roof using marine-grade adhesive and mechanical fasteners, ensuring it’s positioned to maximize sun exposure and minimize shading from roof vents. Mount the Victron SmartSolar MPPT charge controller near your battery compartment with proper ventilation, keeping it away from moisture and extreme heat sources.
Step 4: Wire Fuse & Battery Disconnect
You must install the ANL fuse holder with the 200A fuse within 45 centimeters of your LiFePO4 battery’s positive terminal using 4/0 AWG welding cable. This critical safety component protects your entire electrical system from short circuits and prevents potential fire hazards during installation or emergency situations.
Step 5: Connect DC-DC Charger & Bus
You’ll wire the 40A DC-DC battery-to-battery charger from your vehicle’s alternator to your lithium battery through the bus bar/power distribution terminal block, using appropriately sized cable for each connection. The bus bar serves as your central distribution point, allowing you to connect multiple loads (inverter, solar controller, battery monitor) to a single location.
Step 6: Complete Solar & Monitor Connections
You should run the solar panel wires through appropriate conduit to the Victron SmartSolar MPPT controller, then connect the controller’s battery terminals to your lithium battery bank via the fused disconnect. Connect the BMV-712 shunt wiring to the controller and battery monitor using the supplied communication cables to enable full system integration and monitoring.
Step 7: Test System & Verify Operations
You’ll power on the battery monitor first and verify correct voltage readings (typically 12.8V for a fully charged LiFePO4), then check the solar controller’s display to confirm it’s detecting panel voltage and charging current. Finally, test your DC-DC charger by starting the engine and confirming it initiates charging, then verify all connections are secure and warm to the touch without excessive heat.
Recommended Parts
| Part | Link |
|---|---|
| 100Ah LiFePO4 drop-in lithium battery | View on Amazon |
| Victron SmartSolar MPPT charge controller | View on Amazon |
| Victron BMV-712 battery monitor | View on Amazon |
| 40A DC-DC battery-to-battery charger | View on Amazon |
| 200W flexible solar panel | View on Amazon |
| ANL fuse holder + 200A fuse | View on Amazon |
| 4/0 AWG welding cable (battery interconnect) | View on Amazon |
| Bus bar / power distribution terminal block | View on Amazon |