Victron Phoenix IP43 50A (3) wiring diagram

These notes cover the Smart IP43 12/50 (3), 120–240 V version visible in the catalog photograph. It supplies up to 50 A total to nominal 12 V batteries. The current manual specifies 85–250 VAC, startup from 90 VAC and full power from 100 VAC. Older 230 V-only Phoenix units need their matching instructions; the family name alone does not make their input range or auxiliary rating identical.

BATT 1/2/3 + map to three FET-isolated positives. The charger has one common negative; the three negative symbols are logical connections to a common bus. Each battery positive needs its own protection near that battery. All outputs share the total current and one charging algorithm, so their batteries must be compatible with the same voltage profile.

AC L / N / earth describe the IEC mains inlet and protective-earth connection. The symbol omits remote H/L, programmable relay, and VE.Direct. Use the correct mains cord with its retainer and an earthed outlet. The remote connector can receive a compatible BMS charge-permission control; it does not carry charging current.

The printed page 19 table recommends 16 mm² through 3 m one way; longer listed runs are not recommended with the supported terminal size. These values assume at least 90°C insulation, open unbundled routing at 30°C, equal positive/negative lengths, and a 3% voltage-drop limit. They do not approve the same cable in every conduit or engine space.

Main DC terminals accept up to 16 mm² and tighten to 2.4 N·m. Fit suitable protection close to each battery positive. This manual's wiring diagrams require fuses/breakers but do not give a universal model-specific fuse amperage; select the rating with the installed conductor and battery fault current rather than borrowing another charger family's table.

Select battery chemistry, charge voltage/current, and any required BMS control before use. Low mode limits this model to 25 A. Normal mode is 14.4 V absorption, 13.8 V float and 13.2 V storage; lithium uses its own preset without lead-acid temperature compensation. Configure all banks for one compatible charging profile. Remote control and the programmable relay have distinct functions; a relay signal is not a substitute for wiring the charge-disable input correctly.

Mount vertically, terminals down, with 100 mm ventilation space above and below, on a nonflammable surface. Use a protected, dry location away from battery gases. Verify each bank's polarity and charging voltage, then test the configured current limit and any BMS stop command. The specification table rates full current through 40°C; heat and connected loads reduce charging headroom.