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Sunny Boy 2000
3.3.1 Mains Connection
The Sunny Boy must be connected to the mains with three cables (L, N, PE).
We recommend a 16 A fuse with 'B' characteristics for the circuit the
Sunny Boy is connected to. No consumers are allowed on this circuit
or else must be fused separately.
The inverter autonomously monitors ground fault currents of the PV-panel (PV-
modules, cabling and inverter) and disconnects the plant from the mains if the dis-
charge current changes drastically by ≥ 30 mA. The inverter distinguishes between
real ground fault currents and normal capacitive discharges. Conventional AC-
sensitive RCBs with a sensitivity of 30 mA could result in "false alarms" due to the
normal capacitive discharges resulting in disconnection.
The installation of an additional RCB in the mains connection cable
is therefore not advisable.
If the user wishes to install an additional RCB anyway this must have at least a sen-
sitivity of 100 mA.
Note that accessible components of the PV-system (metal frames,
aluminum foil shielding of the PV-panels, mounting racks etc.) must
be grounded in order to provide a safe discharge from the system
during operation.
A sufficiently thick cable should be used to prevent an increase of the grid imped-
ance (internal resistance of the grid) resulting from the connection between the
Sunny Boy and the in-house distribution network - Z
about this in paragraph "Autonomous grid disconnection device (MSD)" in chapter
2.3, page 13).
The impedance value results from the mains impedance at the house
connection point plus all resistance values of additional cables and con-
nection points.
SB2000-11:EE
≤ 0.5 Ω is recommended. (More
L
- 24 -
Technical Description
SMA Regelsysteme GmbH
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