3
mounted again. The inverter must not be open during operation.
Maintenance and modification:
Only authorized personnel are allowed to repair or modify the inverter. To ensure
optimum safety for user and environment, only the original spare parts available from
your supplier should be used.
Functional safety parameters:
Unauthorized changes of functional safety parameters may cause injury or accidents to
people or inverter. Additionally it will lead to the cancelling of all inverter operating
approval certificates.
1.4 System sizing
When dimensioning a photovoltaic system, it must be ensured that the open circuit
voltage of the PV string never exceeds the maximum permissible input voltage of 1000V
DC. The PV string open circuit voltage during parallel string operation is 950V. Higher
voltages may result in permanent damage to the inverter.
The selection of PV string output should be based on the optimum utilization of the invested capital compared
to the expected annual energy yield from the system. This optimization depends on local weather conditions
and should be considered in each individual case.
The inverter incorporates an input power limiting device, which automatically keeps the power at levels that are
safe for the inverter. The limitation depends mainly on internal and ambient temperatures. The limitation is
calculated continuously and always allows the maximum possible amount of energy to be produced.
Please use the tool supplied by Renac Power when dimensioning a photovoltaic system.
2. Technical description of inverters
2.1 Mechanical design
Figure 2-1 shows the outline dimensions of NAC20K-DT/NAC25K-DT/NAC30K-DT/NAC33K-DT.
Figure 2-1 Outline dimensions
Summary of Contents for R3 Pro NAC20K-DT
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