Manual Energy Storage Inverter ESI-S
Mechanical design and installation 35
5.6 Airflow and cooling requirements
The ESI-S dissipates an amount of heat that has to be evacuated out of the room where
the inverter is located. Otherwise, excessive temperature rise may be experienced.
Please note that life of the electrical equipment decreases drastically if the operating
temperature exceeds the allowable limit (divided by 2 every 10°C/23°F).
Each ESI-S power unit has their own cooling fans. The air intakes are located at the
bottom of the unit. From the bottom, the air flows through the enclosure and is then
routed to the top of the enclosure. For proper cooling, a minimum airflow of cooling air
has to be supplied to each unit.
gives the airflow requirements for different unit
ratings.
Table 17: Airflow requirement
Unit
rating
Power
rating
(kVA)
Airflow
requirement
(m³/h)
30A
-
60A
20-40
520 m³/h
70A - 100A
50-70
520 m³/h
120A
85
710m³/h
Please ensure that the air used for cooling is regularly renewed and does not contain
conductive particles, significant amounts of dust, or corrosive or otherwise harmful
gases. The cooling air intake temperature must not exceed 40°C under any operating
condition. The hot exhaust air also has to be properly ducted away.
shows the
cooling air flow diagram for a single unit ESI-S.
Bottom view
Top view
Figure 26: Cooling air flow for a single unit ESI-S
When the natural cooling capacity at the location where the inverter is installed is not
sufficient, air conditioning systems have to be installed to the room. In the design of the
air conditioning systems, the inverter heat losses have to be taken into account.
gives an overview of the ESI-S heat losses for the different power units. For multi-unit
inverters, the values of
have to be multiplied by the number of units.
