Mounting; Figure 1, Power Output Versus Temperature - Trace Engineering LEGEND II Manual

4kw
3kw
Power
Output
2kw
1kw
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Figure 1, Power Output Versus Temperature is for the L3012. It outlines the ambient temperature
needed in order for the inverter to perform to its published specifications.
The chart shows the output capabilities of the inverter, which is dependent on the ambient
temperature in the enclosure where the inverter is located. The dark line represents the maximum
power that may be expected from the inverter for a given ambient temperature. Testing has shown
that the volume of the enclosure is not as important as the overall ventilation. As long as a minimum
airspace of 1 ò - inches is maintained around the sides of the inverter, and three inches at the back of
the inverter with the cooling fan, adequate ventilation should be maintained. Because the top of a
Legend Series II inverter is not vented, clearance between the enclosure and the top of the inverter is
not relevant.
The fan at the end of the inverter enclosure is for cooling. This fan pressurizes the inverter and
ventilates through the side vents of the unit. A fresh air intake opening should be provided directly to
the fan if possible, and an exhaust port directly opposite that will allow cool outside air to flow through
the inverter and back out of the enclosure.
UL specification 458 (land vehicle installations) requires that the inverter be mounted on a flat
surface. The purpose of this requirement is to orient the inverter so that its bottom cover has no
holes that would allow burning material to be ejected in the event of an internal fire.
WK

20 30 40
Ambient Temperature in Celsius

Figure 1, Power Output Versus Temperature

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