Sunny Boy 2000
Technical Description
SB2000-11:EE
- 28 -
SMA Regelsysteme GmbH
Safety notice
The resistance of the plus and minus pole and PE is measured each time before the
inverter starts feeding to the grid. If the resistance is below 2 M
Ω
the inverter does
not begin feeding the grid and the red warning LED goes on (see chapter 5:
‘Operation and Failure Indication LEDs’).
When the PV-panel is first connected to the Sunny Boy an electric
potential to protective earth arises on the plus and minus lines
equaling the PV-panel voltage (string voltage).
The monitoring of the isolation results in a minor electric connection be-
tween the plus, minus and PE. The high resistance of the monitoring cir-
cuit results in the fact that normally no danger arouses from this circuit,
even though certain voltage meters show a voltage between the case of
the inverter and the plus and minus pole.
A highly dangerous voltage is on between the plus and minus poles of the PV-panel
and PE also during grid feeding by the (transformerless) Sunny Boy 2000.
