Frequently Asked Questions

1. What is the Projecta PM335C Intelli-RV?

Answer:

The PM335C is an integrated 12V power management system designed for caravans and motorhomes.

It provides:

• Service battery charging from AC mains.
• MPPT solar charging.
• Vehicle alternator charging through a built-in VSR.
• Starter battery maintenance charging.
• Low-voltage battery protection.
• Battery isolation and load control.
• Battery voltage, current, remaining capacity and time-remaining monitoring.
• Control of caravan DC loads.
• Control of up to two water-pump outputs.
• Monitoring for up to four water tanks.
• Support for compatible digital displays.
• Built-in RF communication for compatible wireless switches.
• RS485 and CAN communication compatibility.

2. Which display screens are compatible with the PM335C?

Answer:

The PM335C can be used with the following Projecta displays:

• PMD-BT3C.
• PMD-BT4C.
• PMD-BT7C.

The functions and configuration options available may depend on the display installed.

The correct display cable must also be used. Display cables are available in different lengths, including 5-metre and 10-metre versions.

3. Which charging sources can the PM335C use?

Answer:

The PM335C can receive charging power from:

• 240V AC mains.
• Solar panels.
• The vehicle starter battery or another suitable DC charging source.

The source priority is:

• AC mains and solar: Both sources may be available, with AC mains controlling the charging operation.
• AC mains and vehicle input: AC mains has priority.
• Solar and vehicle input: Both sources can contribute according to the system’s charging logic.

The AUX or Solar LED may flash slowly when the input is available but AC mains is currently charging the service battery.

4. Which battery types are supported by the PM335C?

Answer:

The PM335C supports the following nominal 12V service battery types:

• AGM.
• GEL.
• WET or flooded lead-acid.
• LFP or LiFePO4 lithium.

The selected battery type must match the battery installed in the caravan.

Incorrect battery selection may result in unsuitable charging voltage, reduced battery life, poor charging performance or battery damage.

5. How do I set the battery type?

Answer:

Battery type can be selected through a compatible digital display.

The PM335C also has DIP-switch settings for applications where configuration is completed directly at the unit.

Battery-type DIP-switch settings

• WET: Switch 3 ON and Switch 4 ON.
• LFP lithium: Switch 3 ON and Switch 4 OFF.
• GEL: Switch 3 OFF and Switch 4 ON.
• AGM: Switch 3 OFF and Switch 4 OFF.

Charging voltages

WET

• Absorption: approximately 14.7V.
• Float: approximately 13.7V.

LFP lithium

• Absorption: approximately 14.2V.
• Float: approximately 13.5V.

GEL

• Absorption: approximately 14.1V.
• Float: approximately 13.5V.

AGM

• Absorption: approximately 14.4V.
• Float: approximately 13.5V.

DIP switch 5 is not currently used and should remain in the OFF position. The manual advises that DIP-switch adjustment is generally not required when a compatible digital display is used.

6. How do I set the charging current?

Answer:

Charging current can normally be configured through the compatible digital display by entering the battery capacity.

The PM335C uses approximately 10% of the selected battery capacity as the default lead-acid charging current.

For lithium batteries, the maximum charging current may be set at up to approximately 30% of the battery capacity, subject to the battery manufacturer’s limits.

DIP-switch charging-current settings

Switch 1 ON and Switch 2 ON

• AC charging: 10A.
• Solar charging: 20A.
• Lithium AC/solar charging: 30A.

Switch 1 ON and Switch 2 OFF

• AC charging: 15A.
• Solar charging: 30A.
• Lithium AC/solar charging: 30A.

Switch 1 OFF and Switch 2 ON

• AC charging: 20A.
• Solar charging: 30A.
• Lithium AC/solar charging: 30A.

Switch 1 OFF and Switch 2 OFF

• AC charging: 30A.
• Solar charging: 30A.
• Lithium AC/solar charging: 30A.

Always confirm the battery manufacturer permits the selected charging current.

7. What do the PM335C charging stages mean?

Answer:

The PM335C uses a five-stage charging process.

Soft Start

The charger begins charging gently when the battery voltage is very low.

Bulk

The charger supplies a higher current to increase the battery state of charge quickly.

Absorption

The charger maintains a controlled voltage while completing the battery charge.

Float

The battery is fully charged and is maintained at a safe voltage.

Recycle

The charger periodically checks and maintains the battery during extended connection.

If a new AC or solar source is connected while the charger is in Float mode, the charging process may return to the Bulk stage.

8. What do the CHG LED indications mean?

Answer:

The green CHG LED indicates the service battery’s operating condition.

• Solid ON: The battery is charging in the Float stage.
• Slow flashing once per second: The battery is in Bulk, Absorption or VSR charging.
• Quick flashing twice per second: The battery is discharging.
• OFF: The service battery is disconnected.

A quick-flashing CHG LED does not necessarily indicate a fault. It normally means the battery is supplying power to connected loads.

9. Does the PM335C charge the vehicle starter battery?

Answer:

Yes. When AC mains or solar charging is available, the PM335C can provide up to approximately 3A of maintenance charging to the vehicle starter battery.

Maintenance charging normally begins when:

• The starter battery falls below approximately 12.4V.
• The low-voltage condition remains present for approximately 30 minutes.

Maintenance charging stops when the starter battery reaches approximately 12.8V.

This function is intended to maintain the starter battery rather than rapidly recharge a heavily discharged vehicle battery.

10. What solar input can be connected to the PM335C?

Answer:

The PM335C includes a built-in MPPT solar controller.

The main solar-input limits are:

• Maximum open-circuit voltage: 50V DC.
• Maximum solar charging current: 30A.
• Maximum solar supply current: 30A.

The solar array’s open-circuit voltage must remain below 50V under all conditions, including cold weather when panel voltage can increase.

Solar installation and testing should be completed by a suitably qualified installer.

11. Why can a lithium battery’s BMS disconnect during solar charging?

Answer:

The manual notes that solar charging may occasionally cause the overvoltage protection inside a LiFePO4 battery’s BMS to operate.

When this occurs:

1. Isolate or disconnect the PM335C solar charging fuse using the approved procedure.
2. Turn off unnecessary charging sources.
3. Apply a suitable load to discharge the battery slightly.
4. Allow the battery BMS to reset.
5. Confirm the correct LFP battery type is selected.
6. Confirm the battery manufacturer permits the configured charging voltage.
7. Reconnect solar charging only after the battery and settings have been checked.

Arrange technical inspection if the BMS continues disconnecting during normal charging.

Do not bypass the battery BMS or its protection system.

12. How does vehicle or alternator charging work?

Answer:

The PM335C includes a voltage-sensitive relay, commonly called a VSR.

The VSR connects the service battery to the vehicle charging input while the engine is running.

Lead-acid service battery

The VSR normally connects when:

• The starter battery reaches approximately 13.4V.
• The voltage remains above the threshold for approximately 10 seconds.

It normally disconnects when:

• The starter battery falls below approximately 12.8V.
• The condition remains present for approximately 60 seconds.

LiFePO4 service battery

The VSR normally connects when:

• The starter battery reaches approximately 14.0V.

It disconnects when the charging current into the service battery falls below approximately 2A for the programmed delay.

The PM335C starter-battery input does not provide five-stage charging. It passes the charging power available from the vehicle alternator.

13. Is the PM335C suitable for vehicles with smart alternators?

Answer:

The built-in VSR may not operate correctly with some variable-voltage, temperature-compensated or smart alternators.

Symptoms may include:

• Vehicle charging starting and stopping repeatedly.
• The AUX LED flashing.
• No charging from the vehicle.
• Charging only at certain engine speeds.
• Charging stopping when the alternator voltage reduces.

For vehicles with smart alternators, a compatible Projecta PMDCS DC-DC charger may be required.

A qualified auto electrician should confirm the vehicle charging system before a DC-DC charger is installed.

14. Can the PM335C operate without a service battery?

Answer:

Yes. When no service battery is connected, the PM335C can automatically operate as a DC power supply.

The operating section of the manual states that the output is approximately 12.8V DC.

However, the specification table lists a nominal power-supply output of 14.4V DC. This value should be technically confirmed before publishing it as a fixed customer specification.

15. How does low-voltage battery protection work?

Answer:

The PM335C automatically disconnects controlled loads when the service battery voltage becomes too low.

Default lead-acid settings

• Disconnect voltage: approximately 10.5V.
• Reconnect voltage: approximately 11.5V.

Default LFP lithium settings

• Disconnect voltage: approximately 11.2V.
• Reconnect voltage: approximately 12.2V.

The default low-voltage disconnect delay is approximately 60 seconds.

Class C3 outputs remain active while the battery switch is ON, although they are protected by the low-voltage system.

Class D constant-supply outputs are not protected by the low-voltage disconnect and may continue drawing power.

16. How are the PM335C outputs grouped?

Answer:

The PM335C has 15 output circuits divided into the following categories.

Class A5

• Two relay-controlled and fused outputs.
• Protected by the main battery-switch relay.
• Normally used for water pumps.

Class C2

• Ten fused outputs.
• Protected by the main battery-switch relay.
• Suitable for lighting, ventilation fans and similar loads.

Class C3

• Two always-on outputs.
• Protected by the low-voltage disconnect.
• Suitable for refrigerators, security alarms and similar equipment.

Class D

• One constant-supply output.
• Not protected by the low-voltage disconnect.
• Suitable for breakaway systems, sway controllers and radio memory.

The specification section identifies 14 fused outputs, which aligns with the Class A5, C2 and C3 circuits. The Class D output is the separate constant-supply circuit.

17. How does the manual battery switch work?

Answer:

The PM335C has an ON/OFF switch on the side of the unit.

When operating from the service battery alone:

• Switching it ON powers the PM335C and controlled battery outputs.
• Switching it OFF isolates the system from the service battery.

When AC mains is connected:

• Switching it OFF may place the system into sleep mode.

The manual battery switch must be ON before an optional remote battery switch can operate.

18. How does the optional remote battery switch work?

Answer:

The remote-switch terminals are located near the positive load terminals.

The remote switch performs a similar function to the manual battery switch.

For correct operation:

1. The side-mounted manual switch must be ON.
2. The remote switch must be connected to the correct terminals.
3. The two remote-switch terminals must be bridged when no remote switch is installed.
4. The external switch must provide the required open-and-closed contact.

Removing the bridge without installing a remote switch may prevent the PM335C from operating normally.

19. How does the PM335C measure battery state of charge?

Answer:

The PM335C has a built-in shunt and battery-monitoring system.

It can measure:

• Service battery voltage.
• Charging current.
• Discharging current.
• Remaining battery capacity in amp-hours.
• Estimated time remaining.

For accurate readings, relevant loads and charging sources must pass through the PM335C measurement path.

Loads connected directly to the battery may not be included in the calculation.

For high-current equipment connected directly to the battery, such as an inverter, a Projecta PMSHUNT may be required to maintain accurate state-of-charge information.

20. What does Night Mode do?

Answer:

When Night Mode is active:

• The display backlight turns off.
• The cooling fans operate at a reduced speed.
• Charging current is reduced to approximately half of the selected charging rate.

Battery charging may take longer while Night Mode is active.

Night Mode should be turned off when maximum charging performance is required.

21. Which water tank probes are compatible with the PM335C?

Answer:

The PM335C can monitor up to four water tank probes.

Compatible probe types include:

PMWS200

• Side installation.
• Suitable for tanks deeper than approximately 200mm.

PMWS400

• Side installation.
• Suitable for tanks approximately 300mm to 400mm deep.

Confirm the tank depth, probe length and installation method before ordering a probe.

22. How much ventilation space is required around the PM335C?

Answer:

Maintain at least 50mm of clearance on both the left and right sides of the PM335C.

The installation compartment should provide adequate ventilation and airflow.

The manual recommends a ventilation opening of approximately:

• 144mm wide.
• 54mm high.

Do not:

• Cover the cooling vents.
• Install the unit in a sealed compartment.
• Place equipment directly against the cooling openings.
• Install the PM335C immediately beside another heat source.

23. What battery-monitor maintenance is recommended?

Answer:

To maintain accurate battery-monitor readings:

1. Fully charge the service battery from AC mains approximately every two weeks.
2. Complete a full AC mains charge at least once every three months.
3. Continue charging until the CHG LED is solid or the display shows Float.
4. Confirm the PM335C power switch is ON during AC charging.
5. Confirm the installed battery is a nominal 12V battery.
6. After replacing the battery, fully charge it from AC mains to the Float stage.
7. Confirm direct-to-battery loads are measured through a compatible shunt where required.

Solar charging alone may not provide a reliable calibration because sunlight and connected loads can vary.

24. How should the PM335C be prepared for storage?

Answer:

For storage without an external charging source:

1. Fully charge the service battery.
2. Turn off unnecessary loads.
3. Turn off the manual battery switch or remote battery switch.
4. Check whether any Class D or direct-to-battery loads remain active.
5. For storage of three months or longer, consider isolating battery fuses as recommended by the manual.
6. Fully recharge the battery at least once every three months.
7. Follow the battery manufacturer’s storage instructions.

Turning off the battery switch reduces PM335C current draw, but constant-supply or direct battery loads may continue discharging the battery.

Troubleshooting Questions and Answers

The front-panel LEDs identify AC input, vehicle input, solar input, charging status and fault conditions.

1. Why does the PM335C have no display or no DC output?

Answer:

Check the following:

1. Confirm the service battery is connected.
2. Check the battery polarity.
3. Measure the service battery voltage.
4. Confirm the side-mounted manual battery switch is ON.
5. If a remote switch is installed, confirm it is ON.
6. If no remote switch is installed, confirm the remote terminals are bridged.
7. Check the display communication cable.
8. Confirm the LOAD function is switched on through the display.
9. Check the output fuses.
10. Check whether the red Fault LED is illuminated or flashing.

If the battery voltage is below the low-voltage disconnect threshold, controlled loads may remain off until the battery is charged above the reconnect voltage.

2. Why is the Mains LED flashing quickly?

Answer:

A quickly flashing Mains LED indicates an abnormal AC input.

Follow these steps:

1. Disconnect the PM335C from AC mains.
2. Inspect the AC cable and IEC connector.
3. Check for visible damage, overheating or loose connections.
4. Check whether the supplying circuit breaker or safety switch has tripped.
5. Confirm the AC outlet is approximately 240V and correctly earthed.
6. Reconnect the unit to a known suitable supply.
7. Check whether the Mains LED becomes solid.

Stop using AC charging if the LED continues flashing.

Fixed 240V wiring must be tested or repaired by a licensed electrician.

3. Why is the AUX LED flashing quickly?

Answer:

A quickly flashing AUX LED indicates a starter-battery or vehicle-input error.

Follow these steps:

1. Disconnect the caravan from the towing vehicle.
2. Inspect the vehicle connector and trailer plug.
3. Check for loose, damaged or corroded terminals.
4. Confirm the positive and negative vehicle connections are correct.
5. Measure the starter battery voltage.
6. Confirm the vehicle charging voltage does not exceed 16V.
7. Reconnect the vehicle and start the engine.
8. Check whether the AUX LED returns to solid or slow flashing.

Arrange inspection by a qualified auto electrician if the AUX LED continues flashing.

4. Why is the AUX LED flashing slowly?

Answer:

A slowly flashing AUX LED normally means:

• The vehicle or auxiliary input is available.
• AC mains is currently charging the service battery.
• AC mains has priority over the vehicle input.

This is generally a normal operating condition.

If vehicle charging does not begin after AC mains is disconnected, check the vehicle voltage and VSR operation.

5. Why is the Solar LED flashing quickly?

Answer:

A quickly flashing Solar LED indicates an abnormal solar input.

Follow these steps:

1. Isolate the solar input using the approved procedure.
2. Check the solar-array open-circuit voltage.
3. Confirm the voltage is below 50V DC.
4. Check the solar polarity.
5. Inspect the solar fuse.
6. Check the solar cable and connectors.
7. Inspect the panels for damage.
8. Reconnect the solar input after the fault has been corrected.

Solar panels may remain electrically live during daylight.

Arrange qualified inspection where live electrical testing is required.

6. Why is the Solar LED flashing slowly?

Answer:

A slowly flashing Solar LED normally means:

• Solar input voltage is available.
• AC mains is currently charging the service battery.
• The solar input is waiting while AC mains has priority.

This is generally normal.

The Solar LED should become solid when solar is actively charging the battery.

7. Why is the CHG LED flashing quickly?

Answer:

A quickly flashing CHG LED normally indicates that the service battery is discharging.

Check the following:

1. Identify which DC loads are operating.
2. Check the displayed discharge current.
3. Turn off unnecessary appliances.
4. Check whether AC, solar or vehicle charging is available.
5. Confirm the battery voltage is not falling excessively.
6. Test the battery if it discharges unusually quickly.

A quick-flashing CHG LED is not itself a fault indication.

8. What does a solid red Fault LED mean?

Answer:

A solid red Fault LED indicates a short circuit.

Follow these steps:

1. Turn off the controlled DC loads.
2. Disconnect recently installed or suspect equipment.
3. Inspect the output wiring.
4. Check for damaged insulation, trapped cables or reversed polarity.
5. Locate and replace any blown fuse only after correcting the cause.
6. Reconnect the loads one at a time.
7. Check whether the Fault LED returns.

Do not repeatedly replace fuses or reset the system without correcting the short circuit.

9. What does one flash of the red Fault LED mean?

Answer:

One flash indicates service battery undervoltage.

Follow these steps:

1. Turn off unnecessary loads.
2. Connect AC mains, solar or vehicle charging.
3. Measure the service battery voltage.
4. Check the battery terminals.
5. Allow the battery to charge above the reconnect threshold.
6. Test the battery if the voltage falls again quickly.

Default thresholds

Lead-acid

• Disconnect: approximately 10.5V.
• Reconnect: approximately 11.5V.

LFP lithium

• Disconnect: approximately 11.2V.
• Reconnect: approximately 12.2V.

Stop using a battery that is swollen, leaking, venting or excessively hot.

10. What do two flashes of the red Fault LED mean?

Answer:

Two flashes indicate service battery overvoltage.

Follow these steps:

1. Turn off or isolate charging sources where safe.
2. Measure the service battery voltage.
3. Confirm the correct battery type is selected.
4. Confirm the battery capacity and charging current are correct.
5. Check the solar-array voltage.
6. Check the vehicle charging voltage.
7. Arrange qualified inspection if the voltage remains high.

During an overvoltage condition, the PM335C may disconnect the charger and controlled loads to protect the system.

11. What do three flashes of the red Fault LED mean?

Answer:

Three flashes indicate heatsink overtemperature.

Follow these steps:

1. Reduce the connected electrical load.
2. Turn off high-current appliances.
3. Check the PM335C ventilation openings.
4. Confirm there is at least 50mm clearance on both sides.
5. Confirm the cooling fan is operating.
6. Allow the unit to cool.
7. Restart the system only after the temperature has returned to normal.

Arrange technical inspection if the fault returns under a normal load.

12. What do four flashes of the red Fault LED mean?

Answer:

Four flashes indicate a Bulk charging timeout.

The battery has remained in the Bulk charging stage longer than expected.

Follow these steps:

1. Turn off unnecessary DC loads.
2. Check the service battery terminals.
3. Inspect the battery cables.
4. Confirm the battery type is correct.
5. Confirm the battery capacity is correct.
6. Check the configured charging current.
7. Fully test the service battery.
8. Restart charging after the cause has been corrected.

A battery with a failed cell or reduced capacity may remain in Bulk charging for an excessive period.

13. What do five flashes of the red Fault LED mean?

Answer:

Five flashes indicate abnormal VSR or vehicle charging operation.

Follow these steps:

1. Disconnect the caravan from the towing vehicle.
2. Inspect the trailer plug and vehicle charging connection.
3. Measure the starter battery voltage.
4. Check the vehicle negative connection.
5. Confirm the engine is running.
6. Check whether the vehicle has a smart alternator.
7. Reconnect the caravan.
8. Check whether the AUX LED becomes solid.

A compatible DC-DC charger may be required where the vehicle has a smart or variable-voltage alternator.

14. What do eight flashes of the red Fault LED mean?

Answer:

Eight flashes indicate that the PM335C unit temperature is too high.

Follow these steps:

1. Turn off high-current loads.
2. Reduce the charging current where appropriate.
3. Check for blocked ventilation openings.
4. Confirm the installation compartment has suitable airflow.
5. Allow the unit to cool.
6. Restart the system.
7. Check whether the fault returns.

Do not continue using the system if the casing, cables or terminals remain excessively hot.

15. What do nine flashes of the red Fault LED mean?

Answer:

Nine flashes indicate overheating in the PCB or load circuit.

Follow these steps:

1. Turn the controlled loads off.
2. Disconnect high-current appliances.
3. Check the output current used by each load.
4. Inspect the output terminals and wiring.
5. Check for loose or heat-damaged connections.
6. Check for undersized cables.
7. Allow the PM335C to cool.
8. Reconnect loads individually.

Arrange qualified inspection if the fault returns or there is evidence of melted wiring or damaged connectors.

16. Why is the service battery not charging from the vehicle?

Answer:

Check the following:

1. Confirm the engine is running.
2. Check the starter battery voltage.
3. For a lead-acid system, confirm the voltage reaches approximately 13.4V.
4. For an LFP system, confirm the vehicle input reaches approximately 14.0V.
5. Check the AUX LED.
6. Inspect the vehicle charging cable.
7. Check the trailer plug and socket.
8. Confirm the service battery connection is correct.
9. Check whether the vehicle has a smart alternator.
10. Have voltage drop and cable capacity checked by a qualified auto electrician.

The VSR may not connect where the vehicle alternator voltage remains below its connection threshold.

17. Why does vehicle charging repeatedly start and stop?

Answer:

Repeated VSR cycling may be caused by:

• A smart or variable-voltage alternator.
• Excessive voltage drop in the vehicle cable.
• A weak starter battery.
• Loose trailer-plug connections.
• An undersized cable.
• A poor negative return.
• Charging current causing the vehicle voltage to fall below the disconnect threshold.

Have the starter battery voltage measured at both the vehicle battery and the PM335C input while charging.

A Projecta DC-DC charger may be required for vehicles with smart alternators.

18. Why does the remote battery switch not work?

Answer:

Follow these steps:

1. Confirm the manual switch on the side of the PM335C is ON.
2. Check the remote-switch wiring.
3. Confirm the wires are connected to the correct remote terminals.
4. Check whether the external switch opens and closes correctly.
5. Inspect the terminal bridge.
6. If no remote switch is installed, confirm both terminals are bridged.
7. Check for an active undervoltage or fault condition.

The remote switch cannot operate when the side-mounted manual switch is OFF.

19. Why is the displayed battery percentage inaccurate?

Answer:

Follow these steps:

1. Confirm the correct battery type is selected.
2. Confirm the battery capacity is correct.
3. Identify loads connected directly to the battery.
4. Identify charging sources connected directly to the battery.
5. Confirm heavy loads are measured through a PMSHUNT where required.
6. Fully charge the battery from AC mains.
7. Continue charging until Float is displayed.
8. Recheck the state-of-charge reading.

Only current passing through the PM335C or compatible external shunt is included in the state-of-charge calculation.

20. Why does the battery discharge during storage?

Answer:

The battery may continue discharging when:

• The manual battery switch remains ON.
• The remote switch remains ON.
• Class D constant-supply loads remain connected.
• Equipment is connected directly to the battery.
• A breakaway system or sway controller remains powered.
• The PM335C remains in standby.
• The battery is not periodically recharged.

Follow these steps:

1. Fully charge the battery.
2. Turn the manual or remote battery switch off.
3. Identify any constant-supply loads.
4. Check for direct-to-battery equipment.
5. Measure the standby current.
6. Follow the battery manufacturer’s storage procedure.
7. Recharge the battery at least once every three months.

21. Why will the water pump not operate?

Answer:

Follow these steps:

1. Confirm the battery switch is ON.
2. Confirm the LOAD function is ON.
3. Check that the pump output is enabled through the display.
4. Check the pump fuse.
5. Inspect the pump wiring.
6. Confirm the battery voltage is above the low-voltage threshold.
7. Check the pump pressure switch.
8. Check for a seized or damaged pump.
9. Confirm the pump is connected to a Class A5 output.

Repeated fuse failure may indicate a seized pump, damaged cable or short circuit.

22. Why is a water tank showing the wrong level?

Answer:

Follow these steps:

1. Confirm the actual tank level.
2. Confirm the correct tank is selected on the display.
3. Inspect the probe connection.
4. Confirm the probe is connected to the correct Water 1, Water 2, Water 3 or Water 4 port.
5. Check the probe cable.
6. Inspect the probe for contamination.
7. Confirm the probe is suitable for the tank depth.
8. Check the probe installation angle.
9. Restart the display and PM335C.

Incorrect probe selection, installation or wiring can cause inaccurate tank readings.

Safety Warnings

• Disconnect the 240V AC supply before making or breaking battery connections.
• Connect the battery before connecting AC mains.
• Connect positive battery terminals before making the chassis ground connection.
• Make the chassis ground connection away from the battery and fuel lines.
• Connect the charger only to an earthed AC outlet.
• Fixed AC wiring must comply with applicable national wiring rules.
• Do not use a damaged AC cable.
• Do not charge non-rechargeable or frozen batteries.
• Use only the correct battery type and charging-voltage setting.
• Keep flames, sparks and ignition sources away from batteries.
• Provide adequate ventilation during charging.
• Do not expose the PM335C to rain.
• Solar panels may remain electrically live during daylight.
• Do not replace a fuse with a higher-rated fuse.
• Stop using a battery that is swollen, leaking, venting, excessively hot or physically damaged.

When to Contact Projecta Technical Support

Contact Projecta Technical Support when:

• The same fault returns after completing the recommended checks.
• The Mains LED continues flashing with a suitable AC supply.
• Vehicle charging does not operate after the wiring and starter battery have been checked.
• The PM335C repeatedly overheats.
• The lithium battery BMS repeatedly disconnects during charging.
• Fuses continue to fail.
• The display cannot communicate with the PM335C.
• Battery overvoltage continues after charging sources are isolated.
• Wiring, connectors or the PM335C show evidence of heat damage.
• The power-supply output voltage needs to be technically confirmed.

Provide:

• Product model: PM335C.
• Display model.
• Battery type.
• Battery capacity.
• Measured battery voltage.
• Charging sources connected.
• Mains, AUX, Solar and CHG LED status.
• Fault LED flash count.
• Details of connected loads.
• Vehicle make, model and alternator type where relevant.
• Photos of the installation, wiring and connectors where safe.
• Proof of purchase where warranty assessment may be required.

Projecta Technical Support: 1800 422 422.