The Victron Smartsolar MPPT is Australia's most popular solar charge controller.
Here's a complete guide to wiring, configuring and getting the most from your unit viathe VictronConnect Bluetooth app.
This article acts as a guide - always consult a licensed professional Auto Electrician
⏱ 10 min read – Last Updated 2026 -Products: Victron MPPT Range
Why Victron Smartsolar MPPT Controllers Are the Market
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The Victron Smartsolar MPPT range has become the default choice for Australian 4WD, caravan and marine solar installations for several key reasons:
Industry-leading MPPT efficiency (tracking accuracy up to 99%), built-in Bluetooth for smartphone monitoring via VictronConnect, a wide PV input voltage range, and comprehensive battery charge profile customisation for AGM, GEL, lithium and other battery types.
Victron controllers are available in a range of sizes to suit everything from a 100W panel on a camper to a 600W roof array on a large caravan. The most popular models in Australia are the 75/15, 100/30, 100/50 and 150/60 - the numbers represent maximum PV input voltage and maximum charge output current respectively.
Choosing the Right MPPT Model
Model - Max PV Input / Max Charge Current - Best For
Smartsolar 75/1575V 15A 1 × 100–200W panel, small setups
Smartsolar 100/30100V 30A 1–2 × 150–250W panels, most 4WDs
Smartsolar 100/50100V 50A 2–3 × 200W panels, large setups
Smartsolar 150/60150V 60A Large caravan/motorhome arrays
K E Y R U L E
Your solar panel array's open-circuit voltage (Voc) must not exceed the MPPT controller's maximum PV input voltage. Always check your panel's Voc specification - not Vmp. Add 10–15% voltage buffer for cold temperatures, which increase Voc in crystalline panels.
What You'll Need
Victron Smartsolar MPPT controller (appropriate size for your panel and battery)
Solar panel(s) with MC4 connectors or MC4 cable terminations
MC4 solar fuses (15A for most standard panels — required within 1m of panels)
Dual Entry Solar Junction Box for multiple panels
Battery cable (match gauge to your controller output current)
Copper cable lugs for battery terminal connections
Fuse holder with appropriate fuse on the battery positive connection
Smartphone with VictronConnect app (free, iOS and Android)
Wiring Your Victron Smartsolar MPPT — Step by Step
1 - Mount the Controller
Victron Smartsolar MPPT controllers are designed for indoor mounting - inside a canopy, under a bonnet on a heat shield, or inside a caravan. They need ventilation around the heatsink (top of unit) and should not be mounted in sealed enclosures. The unit will get warm under full load - this is normal. Ensure the mounting surface is flat and the unit is vertical or horizontal (not angled).
2 - Connect Battery Terminals First
Victron's connection sequence is critical: always connect the battery terminals BEFORE connecting the PV (solar) input. Connect the positive battery terminal to the B+ port and negative to B– using appropriately rated cable and properly crimped copper lugs. Install a fuse between the battery positive and the controller within 300mm of the battery. The controller will now power on.
3 - Configure Battery Settings via VictronConnect
Open VictronConnect on your smartphone. The controller will appear in the Bluetooth device list - tap to connect (no pairing code required for first connection). Navigate to Settings → Battery. Select your battery type: AGM default, AGM High Voltage, GEL, or use a custom profile for lithium. For lithium (LiFePO4), set: Absorption 14.2V, Float 13.5V, Equalisation disabled. Always verify with your battery manufacturer's recommended charge voltages.
4 - Connect the Solar Panels
Connect your MC4 solar cables to the PV+ and PV– input terminals on the controller. With single panels, connect MC4 direct. For two or more panels, use a Dual Entry Solar Junction Box to combine inputs, with an MC4 Solar Fuse on each panel's positive output before the junction box. Do not exceed the controller's maximum PV input voltage or current. Verify polarity before connecting.
5 - Verify Operation
On a sunny day, the MPPT LED should show green (bulk charging, float or absorption). In VictronConnect, the Dashboard will show solar panel voltage, battery voltage, charge current and today's harvested power (Wh). If the controller shows an error code, refer to the Victron MPPT Troubleshooting guide — the most common issues are reverse polarity PV connection (error 2) and PV voltage too high (error 33).
Please review the manuals below for a direct step by step from Victron
VICTRON Smartsolar MPPT 75/15 - 100/20 - Manual - Click to View
VICTRON Smartsolar MPPT 100/30 - 100/50 - Manual - Click to View
**If you are unsure, consult an auto electrician**
VictronConnect App - Key Settings Explained
CHARGE ALGORITHM
Victron MPPT controllers use a 4-stage charge cycle: Bulk(maximum charge current until absorption voltage reached), Absorption(constant voltage, tapering current), Float(maintenance charge), and optionally Equalisation(for flooded lead-acid only). For AGM and lithium batteries, equalisation should always be disabled.
STREET LIGHT FUNCTION
Victron Smartsolar controllers have a built-in load output (on 75/15 and some other models) that can be used to control LED lights on a sunset-to-sunrise timer or other programmed schedule. This is managed entirely through the VictronConnect app with no external timers required.
HISTORY TAB
The History tab in VictronConnect is extremely valuable - it shows daily production totals, maximum PV power achieved, charge time in bulk vs absorption, and any error events. Use this to check if your panels are performing to specification and if your battery is reaching full charge each day.
I M P O R T A N T
Never connect or disconnect the PV (solar panel) input with the battery disconnected. This can damage the MPPT controller. Always connect battery first, disconnect PV last. When removing the controller, reverse the sequence: disconnect PV first, then battery.
**If you are unsure, consult an auto electrican**
Common Issues and Solutions
Controller not showing in VictronConnect— Ensure Bluetooth is enabled, you're within 10m of the controller, and the controller is powered (battery connected). On Android, location permissions must be granted to VictronConnect.
Low solar output on clear days— Check MC4 connector seating, verify fuse continuity, check for partial panel shading. A single shaded cell can reduce a full panel's output by 50–80%.
Battery not reaching 100% SOC— May indicate battery is aged, absorption time is insufficient, or panel wattage is undersized for current draw. Use History tab to check daily charge/discharge balance.
Error 2 — Battery voltage too low— Battery may be deeply discharged below controller's minimum startup threshold. Charge with an AC mains charger first to bring voltage above 6V (12V battery).
V I C T R O N M P P T R A N G E A T J T S
VICTRON Smartsolar MPPT 75/15 – Click to Shop
VICTRON Smartsolar MPPT 100/30 – Click to Shop
VICTRON Smartsolar MPPT 100/50 – Click to Shop
Dual Entry Solar Junction Box – Click to Shop
MC4 Terminal Connector Pair – Click to Shop
MC4 Solar Fuse 15A – Click to Shop
MC4 Solar Fuse Connector - Click to Shop