SmartSolar 250/100

Victron MPPT 250/100 wiring diagram

100 A SmartSolar with a 250 V absolute PV ceiling and 245 V operating limit. Verify VE.Can and Tr/MC4 suffixes: connector limits and communications depend on the version. Cold-weather array voltage governs string length.

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Compatible systems: 12 V / 24 V / 48 V
Rated output: 100 A
PV open-circuit limit: 250 V

Units

Wiring diagram

How the MPPT 250/100 is wired.

Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.

Victron MPPT 250/100 wiring example with 3 components: Reference PV, MPPT 250/100, House bank. 4 cable connections. Crossings are not junctions.Red = positive · dark = return · dashed = signal. Wire sizes and fuse ratings are example values; use the equipment instructions and actual installation lengths.

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Cable sizing for this example

Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.

3 m one way

12 V system

Wire: 35 mm² · 2 AWG
Example fuse: 125 A
Design current: 100 A
Voltage drop: 2.5%

Sized against ABYC E-11. The design current is the unit's rated output. The length is one way; voltage drop includes an equal-length return.

Run-length and manufacturer assumptions

The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.

Supporting parts

6.1 m total of 35 mm² (2 AWG) marine cable
Terminations for 35 mm² cable, matched to the equipment's screw terminals, leads or studs
125 A fuse and holder on the positive run
Heat-shrink, strain relief and terminal boots sized to the cable

Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.

Installation notes

Before you install.

Open a question for model-specific guidance and sources.

Reviewed against manufacturer family documentation (rev. Rev 12 — 06/2026), checked 2026-10-01. Exact variant details still require confirmation. Manufacturer documentation →

Which 250/100 is this?

The catalog name does not identify connector style or communication generation. These notes use Victron's current SmartSolar MPPT 250/100 VE.Can manual. Check the unit's full part number and Tr versus MC4 suffix before applying its connector and networking details; an older non-VE.Can unit needs its own matching documentation.

This model charges at up to 100 A. Nominal PV power is 1450 W at 12 V or 5800 W at 48 V. The specification table separates 250 V absolute cold-weather maximum from 245 V startup/operating maximum. Array design must satisfy both.

How do the terminals map?

PV + / PV − represent the array input and BATT + / BATT − the battery connection. VE.Can models have one tracker. On the MC4 version, the three connector pairs are internally paralleled; they are not three independent trackers. The symbol groups them into one pair and omits the remote on/off, relay, VE.Can, VE.Direct, and optional display connections.

Total array short-circuit current is limited to 70 A, while each MC4 connector is limited to 30 A. The Tr PV terminals and battery terminals accept up to 35 mm² / AWG 2. A grouped symbol does not authorize putting all array current through one MC4 connector.

What protection and mounting are specified?

The installation table gives a battery fuse range of 120–140 A for this model. Select the actual fuse and conductor together; a terminal's maximum cable size is not a universal cable recommendation. Provide suitable PV isolation and protect connections against contact.

Mount vertically on a nonflammable surface, terminals downward, with 100 mm clearance above and below, within 3 m of the battery but never directly above it. The connection area is IP22; use a dry installation with appropriate guarding. Rated output is specified up to 40°C.

What must be checked at startup?

Connect the battery first and confirm nominal voltage before connecting PV. Automatic selection covers 12/24/48 V; 36 V requires manual selection. PV must initially exceed battery voltage by 5 V, and subsequently by 1 V.

Select the battery's approved charging profile in VictronConnect and confirm BMS charge permission where applicable. Equalization is disabled by default; enable it only for a battery that permits it. Verify cold Voc and string current independently; output power limiting does not make excessive PV voltage acceptable.

Fit check

Connect it to the rest of your system.

Describe your setup to draft a system with SmartSolar 250/100 connected. Review the selected parts and cable lengths, then edit the diagram in Crimp.

The model only picks parts and draws the connections. Every wire size and fuse rating still comes from Crimp's own sizing, never from the model.

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Technical reference

Specifications and terminal map.

Check the model, ratings and connection points against your own unit before choosing installation hardware.

Catalog specification

Compatible systems: 12 V / 24 V / 48 V
Rated output: 100 A
Planning charge current: 100 A
PV open-circuit limit: 250 V

Terminal map

Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.

TerminalPolarityRoleLimit

PV +

positive · input

positiveinput70 A

PV −

negative · input

negativeinput70 A

BATT +

positive · output

positiveoutput100 A

BATT −

negative · output

negativeoutput100 A

Sources and sizing method

Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.

Example sizing. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Results use the example current and run length shown above. Set your actual equipment, lengths and installation conditions in Crimp before choosing hardware.

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Next step

Plan your installation with MPPT 250/100.

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