Victron SmartSolar MPPT 100/30 wiring diagram

This example uses the Victron SmartSolar MPPT 100/30, with Bluetooth and VE.Direct. Connect the array to PV + / PV − and the house bank to BATT + / BATT −. There are no physical LOAD terminals: house loads use protected battery distribution.

For automatic voltage detection, follow Victron's connection sequence:

• Connect the battery first: check polarity, connect it and wait 10 seconds.
• Verify the detected voltage and charging profile for your battery.
• Connect PV after these checks.

The shared manual also covers the 100/50; use the 100/30 column and confirm the model on your unit.

Victron's battery fuse table specifies 35 A minimum and 40 A maximum for the 100/30. The example's calculated battery fuse falls within that range. This protects the battery cable; it does not specify a PV-string fuse.

The example uses 3 m (about 9.8 ft) battery cables each way, with the controller's 30 A rated output and the return included in voltage drop. Enter your actual route and installation conditions in the wire size calculator.

Terminals accept up to 16 mm² / 6 AWG; this is a physical connection limit, not a recommended cable size. Victron specifies mounting within 3 m of the battery, never directly above it, with 10 cm clearance above and below.

Use flexible, multistranded copper cable for both battery and PV connections. Victron's wiring precautions limit each individual strand to 0.4 mm (0.016 in) diameter. This describes the strands inside the cable, not the total cable cross-section: a cable can fit the terminal yet have strands that are too coarse.

Tighten the battery and PV screw connections to 1.6 N·m, as specified in the 100/30–100/50 connection instructions. Use the value for this model rather than transferring a torque from a smaller SmartSolar controller.

The manual's overheating guidance identifies rigid conductors, soldered wire ends, loose screws and insulation inserted into the clamping area as connection hazards. Keep the conductor intact when preparing the end, and check that the terminal clamps the conductor securely. The cable size and terminal's maximum capacity do not replace these connection requirements.

Check all three 100/30 ratings:

• 30 A battery charge output. This is the current delivered to the bank.
• 35 A maximum PV short-circuit current. Check the complete array configuration.
• 100 V maximum PV open-circuit voltage. Include cold-weather voltage rise using the panels' temperature coefficient.

Nominal PV power is 440 W at 12 V or 880 W at 24 V. Those figures do not replace the voltage and current limits. Assess PV fuses and disconnects separately against the panel documentation and Victron's instructions.

No. The drawing sizes the battery-side charge circuit and uses a 12 V, 200 Ah placeholder bank with a 360 W reference array at 20 V operating voltage and 24 V open-circuit voltage. These are editable planning inputs, not a solar-yield prediction. Replace them with your equipment before reviewing the PV wiring.

Supply loads through protected battery distribution, such as a Blue Sea 5026 fuse block. The boat wiring example shows this controller with distribution and loads. Review the sizing methodology as you adapt the installation.