SmartSolar 75/15
SmartSolar 75/15: 15A MPPT for 12/24V batteries, 220/440W nominal PV power and 75V maximum cold-weather Voc. Bluetooth and a separate 15A LOAD output; battery fuse recommendation 20–25A.
Wiring diagram
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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
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.
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.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
LOAD-output connection example
A small, compatible DC load can use the controller’s LOAD terminals. Both conductors belong on that output pair.
Connect the load’s positive wire to LOAD+ and its negative wire to LOAD−. Keep that return separate from battery negative or a shared chassis return. Victron warns that using battery negative gives an incorrect load-current reading. See the load-current troubleshooting instructions.
The 75/15 is rated for 15 A of continuous LOAD current in total. It is not a separate allowance for each light or appliance. Match the loads to the battery voltage and check their starting current against the output’s capability. See the 75/15 ratings.
Victron’s 20–25 A battery-supply fuse range applies to F1, not F2. Size the load branch’s protection for its cable and equipment; the output’s 15 A rating does not select that fuse. See the battery-fuse table.
Connect an inverter or a load with excessive starting current to its own protected battery branch. A compatible remote on/off interface can let LOAD control that equipment without carrying its power current. The interface depends on the device; follow Victron’s physical load-output guidance.
The editable charging example above includes PV and battery connections only. Use this separate reference for the physical LOAD terminals, and the wire size calculator to check a cable run using your actual load and installation conditions.
Installation notes
Open a question for model-specific guidance and sources.
Verified against the manufacturer's documentation (rev. Rev 10 — 02/2026), checked 2026-10-01. Manufacturer documentation →
The SmartSolar 75/15 is a 15 A solar battery charger for automatically detected 12 or 24 V banks. The first number is the PV open-circuit ceiling: 75 V, including the array's cold-weather voltage rise. Nominal array power is 220 W at 12 V or 440 W at 24 V. This is the Bluetooth SmartSolar model; a similarly numbered BlueSolar unit needs different Bluetooth hardware.
PV + / PV − connect the array; BATT + / BATT − connect the fused battery circuit. The physical unit also has LOAD + / LOAD −, omitted from the symbol, with a 15 A load-output limit. Do not put an inverter or a large surge load through that output: connect such loads through their own protected battery branch and use an appropriate remote-control interface if low-voltage shutdown is needed. VE.Direct and the load-setting jumper are also omitted.
The screw terminals accept up to 6 mm² / AWG 10, tightened to 0.75 N·m. Terminal capacity is not a substitute for sizing the conductor for distance, current, and voltage drop.
See the separate 75/15 LOAD-output connection example for a small DC load using both LOAD terminals. The editable charging diagram includes only the PV and battery connections. Use the wire size calculator with your actual load current, cable run and installation conditions; the 15 A output limit does not select a cable or branch fuse.
The battery-fuse table, printed page 11 specifies 20–25 A for this model. Protect the battery positive lead close to the battery. With the array isolated, connect the battery first, wait 10 seconds, and verify the detected voltage in VictronConnect. Then connect the load circuit, PV, and communications. This order matters because the controller learns the battery voltage at startup.
Check both array Voc and total short-circuit current: the model's Isc limit is 15 A. The PV voltage must exceed battery voltage by 5 V to start, then by 1 V to continue. More panel watts do not make excessive Voc or Isc acceptable.
Select a battery-approved charging preset, current limit, and load-disconnect strategy. BatteryLife can manage the load output, but it does not replace a lithium battery's BMS. Disable automatic equalization for chemistries that cannot tolerate it; verify temperature behavior before charging lithium.
Mount vertically, terminals down, on a nonflammable surface with 100 mm clearance above and below. Locate it within 3 m of the battery, never directly above it. Full output is rated to 40°C; the connection area is IP22, so install it in a dry protected location. Confirm charging voltage and current after commissioning using the model specification table.
For a larger system, the campervan solar wiring examples show loads on a separate battery-fed distribution panel, using a different SmartSolar controller. Their loads are not powered through this 75/15 LOAD output. If your bank is lithium, use the LiFePO₄ fuse checker to review exact battery-fuse and holder ratings separately from the controller and load-branch limits.
Fit check
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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
Check the model, ratings and connection points against your own unit before choosing installation hardware.
SmartSolar 75/15: 15A MPPT for 12/24V batteries, 220/440W nominal PV power and 75V maximum cold-weather Voc. Bluetooth and a separate 15A LOAD output; battery fuse recommendation 20–25A.
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
PV +
positive · input
PV −
negative · input
BATT +
positive · output
BATT −
negative · output
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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