Technical data

Corresponding power for inverter type
System type Max K
PV-
AC
:
TripleLynx
CN
8 kW
TripleLynx
CN
10 kW
TripleLynx
CN
12.5 kW
TripleLynx
CN
15 kW
Tracker systems 1.05 8.4 kWp 10.5 kWp 13.1 kWp 15.7 kWp
Fixed systems with optimal con-
ditions: Close to ideal orientation
(between SW and SE) and incli-
nation (more than 10°)
1.12 9.0 kWp 11.2 kWp 14.0 kWp 16.8 kWp
Fixed systems with semi-optimal
conditions: Orientation or incli-
nation exceed the above men-
tioned limits.
1.18 9.4 kWp 11.8 kWp 14.7 kWp 17.7 kWp
Fixed systems with sub-optimal
conditions: Orientation and incli-
nation exceed the above men-
tioned limits.
1.25 10.0 kWp 12.5 kWp 15.6 kWp 18.7 kWp
According to Dr. B. Burger "Auslegung und Dimensionierung von Wechselrichtern für netzge-
koppelte PV-Anlagen", Fraunhofer-Institut für Solare Energiesysteme ISE, 2005.
Table 5.7: Optimisation of PV Configuration*
Note:
The data is only valid for northern European conditions (> 48° North). The PV-to-grid ratio is
given specifically for PV systems that are optimised with respect to inclination and orienta-
tion.
Design for Reactive Power
The nominal active (P) and apparent (S) powers of the inverter are equal. Thus there is no
overhead for producing reactive (Q) power at full active power. When the inverters are installed
in a PV power plant, which has to generate a certain amount of reactive power, the amount of
installed PV capacity per inverter must therefore be reduced.
Two cases must be foreseen:
1. A certain power factor (PF) is required, e.g. PF = 0.95: thus the PV-to-grid ratio, KPV-
AC, should be multiplied with 0.95. The corrected ratio is then used for dimensioning
the plant.
2. The DNO specifies a required amount of reactive power (Q), the nominal power (P) of
the plant is known. The PF can then be calculated as: PF = SQRT(P
2
/(P^2+Q
2
)). The
PF is then applied as above.
Design for Low AC Grid Voltage
The nominal output power of the inverter is specified at a grid voltage of 230 V. The input pow-
er should be derated for an AC grid where the voltage is lower than this. Lower grid voltage
may occur if the inverter is installed in a network far away from the transformer and/or with
high local loads, e.g. in an industrial area. If the AC grid voltage is under the suspicion of being
low, the following steps should be adhered to when designing the PV plant: Measure the grid
voltage at 10, 12 and 14 o’clock (not during holidays), when the load and irradiance is high. If
the voltage is below 230 V, the PV plant should be downsized. Otherwise contact the local DNO
to have them increase the tap on the transformer (if possible). The PV plant should be down-
sized according to:
P
STC
= P
NOM
* K
PV-AC
* measured grid voltage / 230.
Where P
STC
is the installed PV power at STC, P
NOM
is the nominal inverter power, and K
PV-AC
is
the so-called PV-to-grid ratio.
5. Requirements for Connection
40 L00410582-01_02
5