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Chapter 2 Installation and Wiring
2 - 3
(6) Installation method and position
Install the inverter vertically and securely with screws or bolts on a surface that is free from vibrations
and that can bear the inverter weight.
If the inverter is not installed vertically, its cooling performance may be degraded and tripping or
inverter damage may result.
(7) Mounting in an enclosure
When mounting multiple inverters in an enclosure with a ventilation fan, carefully design the layout of
the ventilation fan, air intake port, and inverters.
An inappropriate layout will reduce the inverter-cooling effect and raise the ambient temperature. Plan
the layout so that the inverter ambient temperature will remain within the allowable range.
Position of ventilation fan
(8) Reduction of enclosure size
If you mount the inverter inside an enclosure such that the heat sink of the inverter is positioned
outside the enclosure, the amount of heat produced inside the enclosure can be reduced and likewise
the size of the enclosure.
Mounting the inverter in an enclosure with the heat sink positioned outside requires an optional
dedicated special metal fitting.
To mount the inverter in an enclosure with the heat sink positioned outside, cut out the enclosure panel
according to the specified cutting dimensions.
The cooling section (including the heat sink) positioned outside the enclosure has a cooling fan.
Therefore, do not place the enclosure in any environment where it is exposed to waterdrops, oil mist,
or dust.
(9) Approximate loss by inverter capacity
Inverter capacity (kW) 5.5 7.5 11 15 18.5
22 30 37 45 55
Loss with 70% load (W) 242 312 435 575 698 820 1100
1345
1625
1975
Loss with 100% load (W) 325 425 600 800 975 1150
1550
1900
2300
2800
Efficiency at rated output (%)
94.4
94.6
94.8
94.9
95.0
95.0
95.0
95.1
95.1
95.1
(Unacceptable)
Ventilation fan
Inverter
(Acceptable)
Ventilation fan
Inverter