Switch-Off Function At Low Temperatures; Low-Temperature Option - SMA SUNNY CENTRAL 500CP XT User Manual

SMA Solar Technology AG
Sunny Central 850CP XT
Sunny Central 900CP XT
Sunny Central 1000CP XT
At temperatures up to 25°C, the inverter works at 110% nominal power. At temperatures between 25°C and 40°C,
the AC power supplied by the inverter decreases to 100% of the nominal power indirectly proportional to the
increasing temperature. At temperatures between 40°C and 50°C, the supplied AC power decreases to 90% of the
nominal power. From 50°C upwards, the AC power of the inverter decreases significantly, only reaching 45% of the
nominal power at 55°C.
At ambient temperatures of 60°C, the inverter will only supply 9% of its nominal power. The inverter switches off at
62°C.
Figure 18: Reduction of AC power with increasing temperature
Sunny Central 1000CP XT

10.2.2.6 Switch-Off Function at Low Temperatures

At low temperatures, the inverter operates up to the switch-off threshold in feed-in operation with up to 110% of the
nominal power. The temperature of the switch-off threshold is: −25°C.
If the ambient temperature falls below the switch-off threshold during feed-in operation, the inverter switches to the
operating state "Stop". As soon as the temperature exceeds the switch-on threshold, the inverter resumes feed-in
operation. The temperature of the switch-on threshold is: −20°C.

10.2.2.7 Low-Temperature Option

With the "low-temperature option", the operating temperature range is extended to the following range:
−40°C to +62°C. The inverter is in feed-in operation until the switch-off threshold is exceeded. The temperature of the
switch-off threshold is: −25°C.
If the ambient temperature falls below the switch-off threshold, the inverter switches to the operating state "Stop". In
addition, the installed heating elements switch on to protect the components in the interior against too-low
temperatures. As soon as the temperature exceeds the switch-on threshold, the inverter resumes feed-in operation. The
temperature of the switch-on threshold is: −20°C.
User Manual
25°C 40°C
935 kVA 884 kVA
990 kVA 936 kVA
25°C 40°C
1,100 kVA 1,000 kVA
50°C 55°C
850 kVA 425 kVA
900 kVA 450 kVA
50°C 55°C
900 kVA 450 kVA
10 Function Description
60°C 62°C
85 kVA 0 kVA
90 kVA 0 kVA
60°C 62°C
90 kVA 0 kVA
SCCPXT-E7-BA-en-58 87