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Commercial Diesel Generator

E&OE

Generator Operation

Allowing the generator to run when being overloaded may permanently damage it
and/or shorten its service life and may void product warranty

•

Maximum continuous

run time per day without cool-off is 6 hours @ 50% load, or 4 hours @ 100% load

. The manufacturer

recommends that the unit run for no longer than 600 hours per year for optimum machine
performance and to extend generator life. These conditions assume the engine oil level is correct,
servicing is maintained as per the

schedule

, and conditions are not considered harsh (high

temperature, dust etc)

. • Ensure that the generator is

grounded

(earthed) before using it.

• Ensure that any

device to be powered by the generator is switched OFF before connecting it to the generator.

• Ensure that

all devices that will be powered by the generator are electrically safe and functioning normally. If at any time
a connected device appears to malfunction, stop or slow down etc, immediately switch the generator and
device OFF and disconnect the device.

• Do not exceed the rated power output of the generator. Consider

the power rating for all connected devices that will be running simultaneously, both AC and DC, and ensure
that the sum of all power consumption is no more than the generator rated output with consideration given to
actual power output based on altitude and temperature (see

Understanding Rated Output

). For example, 4 x

1500W devices will be acceptable for a 6.0kW rated output generator, however, will overload a 5.0kW unit.

•

Do not exceed the rated current for the output socket. For example, do not connect a device that draws 15A
to a 10A socket.

• If using an extension cable, ensure it is an approved type and has a minimum wire gauge

of 1.5mm² up to a cable length of 60m; 2.5mm² up to a cable length of 100m.

• For appliances that place

high "inductive" loads when being started or stopped (for example, electric motors), consideration should be
given to the rated output of the generator and the required inductive load capacity. Rated output equates to
approximately 45 to 75% of inductive load capacity.

• Do not connect devices in parallel to the generator. •

Devices sensitive to input voltage fluctuation should be connected via a suitable surge protector.

Understanding Rated Output

The "rated output" is described as the maximum power that the generator can consistently and reliably
provide. The rated output of a generator is based around several factors including altitude, ambient
temperature and relative humidity. The specified rated output is calculated at an altitude of 0m, ambient
temperature of 25°C and relative humidity of 30%. Deviations from these values will affect the actual output
capacity of the generator. For example, if the generator is used at high altitude it will produce less power.

Basically, the higher the altitude, the warmer the ambient temperature and the greater the humidity, the less
power can be produced. The following table provides a guideline for calculating actual generator output
based on ambient temperature and altitude [note that humidity is ignored here as it has a marginal effect]:

Ambient Temperature (°C)

Altitude (m)

Power Output Coefficient

1.0

0.98

0.96

0.93

0.90

500

0.93

0.91

0.89

0.87

0.84

1000

0.87

0.85

0.82

0.80

0.78

2000

0.75

0.76

0.71

0.69

0.66

3000

0.64

0.62

0.60

0.58

0.56

4000

0.54

0.52

0.50

0.48

0.46

Examples:

•

At an approximate altitude of 1000m and 30°C ambient temperature, the power output coefficient is 0.85.
So, a rated output of 6kW becomes 6.0 x 0.85, which equates to an actual power output of 5.1kW.

•

At an approximate altitude of 2000m and 25°C ambient temperature, the power output coefficient is 0.75.
So, a rated output of 6.0kW becomes 6.0 x 0.75, which equates to an actual power output of 4.5kW.

•

At an approximate altitude of 3000m and 40°C ambient temperature, the power output coefficient is 0.58.
So, a rated output of 6.0kW becomes 6.0 x 0.58, which equates to an actual power output of 3.48kW.

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