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Important notes
• When using the inverter in a vehicle, the vehicle must have a 12V DC negative earth electrical
system. This inverter is not compatible with any other type of vehicle earth system. Use with other
systems may cause permanent damage to the inverter and other electrical components.
WARNING: The maximum input current of this inverter exceeds the output of most
alternators fitted to cars and light vans. This inverter used to maximum capacity for an
extended duration even while the engine is running will require current well beyond the
spare current capacity of the alternator. This will discharge the battery until fully discharged
and the vehicle cannot be started.
• When using the inverter in a vehicle, ensure it is securely mounted. This inverter features
a Mounting Plate (16) and Mounting Holes (6). Use screws, bolts or other fasteners (sold
separately) to fix it in place.
• When using the inverter in a stationary set-up, the battery or battery bank MUST be connected to
a ground rod or other earthing (Fig. IV).
• If replacing the supplied 12V Cables (13), select cables that are suitable for the continuous
inverter current, not peak/surge current (see 'Specification'). Ensure the insulation of the cables is
appropriate for the task and environment.
• If using an inline fuse, this should be fitted to the cable that attaches to the inverter's Positive
Terminal (10). Select a fuse of the closest value above the continuous rated current of the inverter
(see 'Specification'). Do not use a quick or fast-blow type fuse as the peak current demands of AC
devices at start-up would be likely to cause false trips.
• Ensure the inverter is disconnected before charging any battery it is connected to.
• Normal automotive (SLI) batteries are not recommended for use with this inverter
if the inverter is used at its maximum output for extended periods, especially if the
inverter is used in a stationary position that does not benefit from having a vehicle
alternator providing part of the current requirements. Recommended battery types are
deep cycle (leisure) or traction batteries. These are purposely designed to be depleted fully at
a low to medium rate and recharged frequently, but do not provide the peak current output of
automotive batteries that is required for starting a vehicle.
• If using multiple batteries, it is recommended that standard automotive (SLI) batteries are
used in parallel (Fig. I). This type and configuration give a sustained high discharge rate across
multiple batteries. This can help such batteries last longer.
Device type
Uses resistive circuit
Uses inductive circuit
Uses capacitive circuit (rare)
Medical or precision
electronic equipment
High initial current
Televisions, fridges, pumps, compressors,
requirement
AC to DC converter in
Laptops, mobile phone chargers, battery
power supply
8
Examples
Kettles, filament bulbs, toasters
Fans, vacuum cleaners, electric drills,
speakers
Some fans, battery chargers, and
electronic timers
Satellite systems, video equipment
Incompatible (depending on
neon lights
Compatible but not advised
chargers
• Use batteries of the same type, manufacturer, age and capacity. Using batteries in this way will
help provide the same level of current, capacity and runtime across all batteries. Differences in
voltage in a battery bank can cause damage and even battery explosion.
• Connecting multiple batteries in series is not recommended when using this inverter.
• When connecting batteries in parallel, do not mix polarities.
Connection instructions
1. Turn the ON/OFF Switch (4) to the OFF position.
2. Connect the 12V Cables (13) to the battery (see Fig. III if connecting to a 12V battery in a vehicle).
If connecting to a 12V battery in a stationary installation, see Fig. IV.
3. If connecting multiple batteries in a stationary installation, ensure they are connected in parallel
(Fig. I). Do not connect in series (Fig. II) as this may damage the battery.
4. Unscrew the Terminal Caps (11) of the 12V Terminals (7).
5. Remove the Lock Washers (9).
6. Attach the free ends of the 12V Cables to the inverter. Connect the black cable to the Negative/
Earth Terminal (12) and the red cable to the Positive Terminal (10).
IMPORTANT: Ensure that the connection between the positive terminal of the battery and the
Positive Terminal of the inverter is made last.
7. Replace the Lock Washers.
8. Refit the Terminal Caps. Check the 12V Cables are connected to the correct 12V Terminals. The
inverter is now ready to be switched ON.
IMPORTANT: If the polarity of the connections is not correct, the inverter 32V Fuses (17) will blow.
Compatibility with mains devices
WARNING: The 230V Universal Mains Sockets (1) fitted to the inverter are a universal type
which will physically accept a wide range of world mains plugs. If using a device intended for a
region outside of the UK or Europe, check that it is suitable for use with the voltage produced by the
inverter (see 'Specification'). Do not connect a device that is only suitable for a lower voltage and a
specific frequency such as 120V 60Hz products intended for the US.
• Check that the mains device intended for connection to the inverter is compatible. Use the table
supplied for guidance.
Compatibility
Mostly compatible
Highly compatible with modified sine wave, no excessive initial current requirement
Not always compatible with modified sine wave, often has very high initial current
Sometimes incompatible
The frequencies generated by the inverter can overload capacitors in highly capacitive
Incompatible
Incompatible
Requires more current than can be supplied by inverter. Peak requirement of these devices
start-up current required)
Inefficient due to energy loss during conversion. A direct 12V DC to DC power supply is
Reason
requirement
circuits
Requires pure sine wave
is not always marked
recommended
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